diff --git a/cores/Spectrum/firmloader_hex.txt b/cores/Spectrum/firmloader_hex.txt
new file mode 100644
index 0000000..99ea4cd
--- /dev/null
+++ b/cores/Spectrum/firmloader_hex.txt
@@ -0,0 +1,6416 @@
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diff --git a/cores/Spectrum/rom_firmloader.v b/cores/Spectrum/rom_firmloader.v
new file mode 100644
index 0000000..2cac252
--- /dev/null
+++ b/cores/Spectrum/rom_firmloader.v
@@ -0,0 +1,39 @@
+`timescale 1ns / 1ps
+//////////////////////////////////////////////////////////////////////////////////
+// Company: 
+// Engineer: 
+// 
+// Create Date:    04:12:52 02/09/2014 
+// Design Name: 
+// Module Name:    rom 
+// Project Name: 
+// Target Devices: 
+// Tool versions: 
+// Description: 
+//
+// Dependencies: 
+//
+// Revision: 
+// Revision 0.01 - File Created
+// Additional Comments: 
+//
+//////////////////////////////////////////////////////////////////////////////////
+module rom (
+    input wire clk,
+    input wire [13:0] a,
+    output reg [7:0] dout
+    );
+
+   reg [7:0] mem[0:8191];
+   integer i;
+   initial begin  // usa $readmemb/$readmemh dependiendo del formato del fichero que contenga la ROM
+      for (i=0;i<8192;i=i+1) begin
+        mem[i] = 8'h00;
+      end
+      $readmemh ("firmloader_hex.txt", mem, 0);
+   end
+
+   always @(posedge clk) begin
+     dout <= mem[a[12:0]];
+   end
+endmodule
diff --git a/firmware/firmloader.asm b/firmware/firmloader.asm
new file mode 100644
index 0000000..2f5ba1b
--- /dev/null
+++ b/firmware/firmloader.asm
@@ -0,0 +1,86 @@
+        output  firmloader.rom
+      macro wreg  dir, dato
+        rst     $28
+        defb    dir, dato
+      endm
+
+        define  zxuno_port      $fc3b
+        define  master_conf     0
+        define  master_mapper   1
+
+        di
+        ld      sp, $bfff
+        ld      de, $c771       ; tras el out (c), h de bffc se ejecuta
+        push    de              ; un rst 0 para iniciar la nueva ROM
+        ld      de, $edff       ; en $bffc para evitar que el cambio de ROM
+        push    de              ; colisione con la siguiente instruccion
+        wreg    master_mapper, 8  ; paginamos la ROM en $c000
+        ld      hl, fin-1
+        ld      d, e
+        rst     $38
+        ld      bc, zxuno_port
+        out     (c), 0          ; a master_conf quiero enviar un 0 para pasar
+        inc     b
+        jp      $bffc
+
+acab    rr      e
+        ex      de, hl
+        adc     hl, de
+        lddr
+exitdz  pop     hl
+        jr      nc, mainlo
+        ret
+
+rst28   ld      bc, zxuno_port + $100
+        pop     hl
+        outi
+        ld      b, (zxuno_port >> 8)+2
+        outi
+        jp      (hl)
+getbit  ld      a, (hl)
+        dec     hl
+        adc     a, a
+        ret
+        nop
+
+; -----------------------------------------------------------------------------
+; ZX7 Backwards by Einar Saukas, Antonio Villena
+; Parameters:
+;   HL: source address (compressed data)
+;   DE: destination address (decompressing)
+; -----------------------------------------------------------------------------
+dzx7b   ld      bc, $8000
+        ld      a, b
+copyby  inc     c
+        ldd
+mainlo  add     a, a
+        call    z, getbit
+        jr      nc, copyby
+        push    de
+        ld      d, c
+        defb    $30
+lenval  add     a, a
+        call    z, getbit
+        rl      c
+        rl      b
+        add     a, a
+        call    z, getbit
+        jr      nc, lenval
+        inc     c
+        jr      z, exitdz
+        ld      e, (hl)
+        dec     hl
+        sll     e
+        jr      nc, offend
+        ld      d, $10
+nexbit  add     a, a
+        call    z, getbit
+        rl      d
+        jr      nc, nexbit
+        inc     d
+        srl     d
+offend  ex      (sp), hl
+        jr      acab
+
+        incbin  firmware.rom.zx7b
+fin
diff --git a/firmware/firmloader.bat b/firmware/firmloader.bat
new file mode 100644
index 0000000..e322bca
--- /dev/null
+++ b/firmware/firmloader.bat
@@ -0,0 +1,3 @@
+sjasmplus firmware.asm
+zx7b firmware_strings.rom firmware.rom.zx7b 
+sjasmplus firmloader.asm
diff --git a/firmware/firmware.asm b/firmware/firmware.asm
index 1b7e0f6..6870191 100644
--- a/firmware/firmware.asm
+++ b/firmware/firmware.asm
@@ -94,12 +94,22 @@
 rst18   push    bc
         jp      alto prnstr
 
-jmptbl  defw    main
+jmptbl
+      IF  recovery=0
+        defw    main
         defw    roms
         defw    upgra
         defw    upgra
         defw    advan
         defw    exit
+      ELSE
+        defw    upgra
+        defw    upgra
+        defw    upgra
+        defw    upgra
+        defw    upgra
+        defw    upgra
+      ENDIF
 
 rst28   ld      bc, zxuno_port + $100
         pop     hl
@@ -539,6 +549,7 @@ bios7   dec     c
 
 ;****  Main Menu  ****
 ;*********************
+      IF  recovery=0
 main    inc     d
         ld      h, l
         call    help
@@ -1060,6 +1071,7 @@ roms10  ld      (offsel), hl
 roms11  dec     iyh
         jr      nz, roms10
         ret
+      ENDIF
 roms12  call    romcyb
         ld      ix, cad50
 roms13  call_prnstr
@@ -1068,6 +1080,7 @@ toanyk  ei
         ld      ix, cad51
         call_prnstr
         jp      waitky
+      IF  recovery=0
 roms144 sub     $72-$6e         ; r= Recovery
         jr      nz, roms139
         ld      hl, $0309
@@ -1308,6 +1321,7 @@ roms27  ld      hl, $0104
         call    window
         ld      a, (codcnt)
         jp      main13
+      ENDIF
 
 ;*** Upgrade Menu ***
 ;*********************
@@ -1383,7 +1397,9 @@ upgra4  ld      h, d
         ld      iyl, a
         ld      a, (codcnt)
         cp      $0d
-upgra5  jp      nz, main9
+      IF  recovery=0
+        jp      nz, main9
+      ENDIF
         ld      hl, (menuop)
         dec     l
         dec     l
@@ -1902,6 +1918,7 @@ upgrai  ld      a, 30
         ld      ix, cad57
         jp      roms13
 
+      IF  recovery=0
 ;*** Advanced Menu ***
 ;*********************
 advan   ld      h, 20
@@ -2071,10 +2088,7 @@ exit4   djnz    exit5
 exit5   djnz    exit6
         jp      loadch
 exit6   call    savech
-exit7 
-      IF  recovery=0
-        jp      star51
-      ENDIF
+exit7   jp      star51
 
 ;++++++++++++++++++++++++++++++++++
 ;++++++++     Boot list    ++++++++
@@ -2186,9 +2200,7 @@ blst4   call    combol
         ld      (active), a
         jr      nc, blst5
         ld      (bitstr), a
-blst5
-      IF  recovery=0
-        jp      start50
+blst5   jp      start50
       ENDIF
 
 imyesn  call    bloq1
@@ -2212,6 +2224,7 @@ upgraf  add     hl, de
         djnz    upgraf
         ret
 
+      IF  recovery=0
 ; ----------------------------
 ; Add an entry to the bootlist
 ; ----------------------------
@@ -2227,6 +2240,7 @@ addbl1  inc     iyl
         sub     2
         sub     iyl
         ret
+      ENDIF
 
 ;first part of loadta
 qloadt  ld      ix, cad49
@@ -2993,6 +3007,7 @@ prnmul  call_prnstr
         inc     ix
         ret
 
+      IF  recovery=0
 bomain  ld      ix, cad65
         ld      bc, $0209
         call_prnstr             ; Performing...
@@ -3024,6 +3039,7 @@ calcu   add     hl, hl
         add     hl, hl
         ld      h, 9
         jp      alto slot2c
+      ENDIF
 
 savena  ld      a, (menuop+1)
         sub     4
@@ -3114,6 +3130,7 @@ waits6  in      a, (c)
         wreg    flash_cs, 1     ; desactivamos spi, enviando un 1
         ret
 
+      IF  recovery=0
 ; ------------------------
 ; Load flash structures from $06000 to $9000  
 ; ------------------------
@@ -3122,6 +3139,7 @@ loadch  wreg    flash_cs, 1
         ld      hl, $0060   ;old $0aa0
         ld      a, $12
         jp      alto rdflsh
+      ENDIF
 
 ; -----------------------------------------------------------------------------
 ; ZX7 Backwards by Einar Saukas, Antonio Villena
@@ -3185,6 +3203,7 @@ get16   ld      b, 0
 ;(empstr): input string
 ; Returns:
 ;       A: binary number
+      IF  recovery=0
 atoi    push    hl
         ld      hl, items
         ld      b, (hl)
@@ -3201,6 +3220,7 @@ romsf   add     a, (hl)
         djnz    romse
         pop     hl
         ret
+      ENDIF
 
       IF  0
 hhhh    push    af
@@ -3248,16 +3268,17 @@ hhhh    push    af
 ;binf jr binf        
       ENDIF
 
+      IF  recovery=0
         incbin  es.zx7b
 fines   incbin  us.zx7b
 finus   incbin  av.zx7b
 finav
-
 ; -----------------------------------------------------------------------------
 ; Compressed and RCS filtered logo
 ; -----------------------------------------------------------------------------
         incbin  logo256x192.rcs.zx7b
 finlog
+      ENDIF
 
 ; -----------------------------------------------------------------------------
 ; Compressed messages
@@ -3265,7 +3286,9 @@ finlog
         incbin  strings.bin.zx7b
 finstr
 
-runbit  ld      b, h
+runbit
+      IF  recovery=0
+        ld      b, h
         call    calbit
         ld      bc, zxuno_port
         ld      e, core_addr
@@ -3417,6 +3440,7 @@ conti9  ld      a, 0
         ld      a, (ix+3)
         out     (c), a
         rst     0
+      ENDIF
 
 ; -------------------------------------
 ; Put page A in mode 1 and copies from 4000 to C000
@@ -3524,6 +3548,7 @@ rdfls2  ini
 ;   DE: destination address
 ;   HL: 4 digit number
 ; ------------------------
+      IF  recovery=0
 wtohex  ld      b, 4
 wtohe1  ld      a, $3
         add     hl, hl
@@ -3599,6 +3624,7 @@ ramts5  inc     hl
         wreg    master_conf, 0
         ld      bc, $0214
         jp      toanyk
+      ENDIF
 
 ; ---------
 ; CRC check
@@ -3626,6 +3652,7 @@ check1  xor     (hl)            ;6*4+4*7+10= 62 ciclos/byte
 ;    A: input slot
 ; Returns:
 ;   HL: destination address
+      IF  recovery=0
 slot2a  ld      de, 3
         and     $3f
         cp      19
@@ -3641,6 +3668,7 @@ slot2c  add     hl, hl
         add     hl, hl
         add     hl, hl
         ret
+      ENDIF
 
 help    call    window
         ld      a, %00111000    ; fondo blanco tinta negra
@@ -3831,6 +3859,10 @@ crctab  incbin  crctable.bin
         incbin  fuente6x8.bin
 chrend
 
+      IF  recovery=1
+        include strings.asm
+      ENDIF
+
         block   $3bbf-$
 
 l3bbf   inc     h               ;4
@@ -4213,360 +4245,10 @@ decbhl  dec     hl
 ;++++++++++++               +++++++++++++
 ;++++++++++++++++++++++++++++++++++++++++
 ;++++++++++++++++++++++++++++++++++++++++
+      IF  recovery=0
         block   $7e00-$
-cad0    defb    'Core:             ',0
-cad1    defm    'http://zxuno.speccy.org', 0
-        defm    'ZX-Uno BIOS v0.41', 0
-        defm    'Copyleft ', 127, ' 2016 ZX-Uno Team', 0
-        defm    'Processor: Z80 3.5MHz', 0
-        defm    'Memory:    512K Ok', 0
-        defm    'Graphics:  normal, hi-color', 0
-        defm    'hi-res, ULAplus', 0
-        defm    'Booting:', 0
-        defm    'Press <Edit> to Setup    <Break> Boot Menu', 0
-cad2    defb    $12, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $13, 0
-        defm    $10, '   Please select boot machine:    ', $10, 0
-cad3    defb    $16, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $17, 0
-cad4    defm    $10, '                                  ', $10, 0
-cad5    defm    $10, '    ', $1c, ' and ', $1d, ' to move selection     ', $10, 0
-        defm    $10, '   ENTER to select boot machine   ', $10, 0
-        defm    $10, '    ESC to boot using defaults    ', $10, 0
-        defb    $14, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $15, 0
-cad6    defb    'Enter Setup', 0
-cad7    defb    ' Main  ROMs  Upgrade  Boot  Advanced  Exit', 0
-        defb    $12, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $19, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $13, 0
-cad8    defm    $10, '                         ', $10, '              ', $10, 0
-        defm    $10, 0
-cad9    defb    $14, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $18, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $15, 0
-        defb    '   BIOS v0.41    ', $7f, '2016 ZX-Uno Team', 0
-cad10   defb    'Hardware tests', 0
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, 0
-        defb    $1b, ' Memory test', 0
-        defb    $1b, ' Sound test', 0
-        defb    $1b, ' Tape test', 0
-        defb    $1b, ' Input test', 0
-        defb    ' ', 0
-        defb    'Options', 0
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, 0
-        defb    'Quiet Boot', 0
-        defb    'Check CRC', 0
-        defb    'Keyboard', 0
-        defb    'Timing', 0
-        defb    'Contended', 0
-        defb    'DivMMC', 0
-        defb    'NMI-DivMMC', 0, 0
-cad11   defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $16, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $17, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0
-        defb    ' ', $10, 0, 0
-cad12   defb    'Name               Slot', 0
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, 0
-        defb    $11, $11, $11, $11, 0
-cad13   defb    $1e, ' ', $1f, ' Sel.Screen', 0
-        defb    $1c, ' ', $1d, ' Sel.Item', 0
-        defb    'Enter Change', 0
-        defb    'Graph Save&Exi', 0
-        defb    'Break Exit', 0
-        defb    'N   New Entry', 0
-        defb    'R   Recovery', 0
-cad14   defb    'Run a diagnos-', 0
-        defb    'tic test on', 0
-        defb    'your system', 0
-        defb    'memory', 0, 0
-cad15   defb    'Performs a', 0
-        defb    'sound test on', 0
-        defb    'your system', 0, 0
-cad16   defb    'Performs a', 0
-        defb    'keyboard &', 0
-        defb    'joystick test', 0, 0
-cad17   defb    'Hide the whole', 0
-        defb    'boot screen', 0
-        defb    'when enabled', 0, 0
-cad18   defb    'Enable RAM and', 0
-        defb    'ROM on DivMMC ', 0
-        defb    'interface.', 0
-        defb    'Ports are', 0
-        defb    'available', 0, 0
-cad19   defb    'Disable for', 0
-        defb    'better compa-', 0
-        defb    'tibility with', 0
-        defb    'SE Basic IV', 0, 0
-cad20   defb    'Behaviour of', 0
-        defb    'bit 6 on port', 0
-        defb    '$FE depends', 0
-        defb    'on hardware', 0
-        defb    'issue', 0, 0
-cad21   defb    $12, $11, $11, $11, ' Options ', $11, $11, $11, $13, 0
-cad22   defb    $10, '               ', $10, 0
-        defb    $14, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $15, 0
-cad88   defb    'Spanish', 0
-cad89   defb    'English', 0
-cad90   defb    'Spectrum', 0
-cad91   defb    'Kempston', 0
-cad92   defb    'SJS1', 0
-cad93   defb    'SJS2', 0
-cad94   defb    'Protek', 0
-cad95   defb    'Fuller', 0
-cad96   defb    'PAL', 0
-cad97   defb    'NTSC', 0
-cad98   defb    'VGA', 0
-cad28   defb    'Disabled', 0
-cad29   defb    'Enabled', 0
-cad30   defb    'Issue 2', 0
-cad31   defb    'Issue 3', 0
-cadv2   defb    'Auto', 0
-cadv3   defb    '48K', 0
-cadv4   defb    '128K', 0
-cadv5   defb    'Pentagon', 0
-cad32   defb    'Move Up    q', 0
-cad33   defb    'Set Active', 0
-cad34   defb    'Move Down  a', 0
-cad35   defb    'Rename', 0
-cad36   defb    'Delete', 0
-        defb    ' ', $12, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    ' Rename ', $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $13, 0
-        defb    ' ', $10, ' ', $1e, ' ', $1f, '  Enter accept  Break cancel ', $10, 0
-        defb    ' ', $16, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $17, 0
-        defb    ' ', $10, '                                 ', $10, 0
-        defb    ' ', $14, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $15, 0
-cad38   defb    'Exit system', 0
-        defb    'setup after', 0
-        defb    'saving the', 0
-        defb    'changes', 0, 0
-cad39   defb    'Exit system', 0
-        defb    'setup without', 0
-        defb    'saving any', 0
-        defb    'changes', 0, 0
-cad40   defb    'Save Changes', 0
-        defb    'done so far to', 0
-        defb    'any of the', 0
-        defb    'setup options', 0, 0
-cad41   defb    'Discard Chan-', 0
-        defb    'ges done so', 0
-        defb    'far to any of', 0
-        defb    'the setup', 0
-        defb    'options', 0, 0
-cad45   defb    'Header:', 0
-cad46   defb    $12, ' Exit Without Saving ', $11, $13, 0
-        defb    $10, '                      ', $10, 0
-        defb    $10, ' Quit without saving? ', $10, 0
-cad47   defb    $12, $11, ' Save Setup Values ', $11, $11, $13, 0
-        defb    $10, '                      ', $10, 0
-        defb    $10, '  Save configuration? ', $10, 0
-cad48   defb    $12, ' Load Previous Values ', $13, 0
-        defb    $10, '                      ', $10, 0
-        defb    $10, ' Load previous values?', $10, 0
-cad42   defb    $10, '                      ', $10, 0
-        defb    $16, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $17, 0
-        defb    $10, '      Yes     No      ', $10, 0
-cad43   defb    $14, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $15, 0
-        defb    $12, $11, $11, $11, ' Save and Exit ', $11, $11, $11, $11, $13, 0
-        defb    $10, '                      ', $10, 0
-        defb    $10, '  Save conf. & Exit?  ', $10, 0
-cad44   defb    $12, $11, $11, $11, ' Load from tape ', $11, $11, $11, $13, 0
-cad445  defb    $12, $11, $11, $11, $11, ' Load from SD ', $11, $11, $11, $11, $13, 0
-        defb    $10, '                      ', $10, 0
-        defb    $10, ' Are you sure?        ', $10, 0
-cad37   defb    'Save Changes & Exit', 0
-        defb    'Discard Changes & Exit', 0
-        defb    'Save Changes', 0
-        defb    'Discard Changes', 0
-cad49   defb    'Press play on', 0
-        defb    'tape & follow', 0
-        defb    'the progress', 0
-        defb    'Break to', 0
-        defb    'cancel', 0, 0
-cad50   defb    'Loading Error', 0
-cad51   defb    'Any key to return', 0
-cad52   defb    'Block 1 of 1:', 0
-cad53   defb    'Done', 0
-cad54   defb    'Slot position:', 0
-cad55   defb    'Invalid CRC in ROM 0000. Must be 0000', 0
-        defb    'Press any key to continue                 ', 0
-cad56   defb    'Check CRC in', 0
-        defb    'all ROMs. Slow', 0
-        defb    'but safer', 0, 0
-cad57   defb    'Machine upgraded', 0
-cad58   defb    'BIOS upgraded', 0
-cad59   defb    'ESXDOS upgraded', 0
-cad60   defb    'Upgrade ESXDOS for ZX', 0
-cad61   defb    'Upgrade BIOS for ZX', 0
-cad615  defb    'Upgrade flash from SD', 0
-cad62   defb    'ZX Spectrum', 0
-cad63   defb    'Status:[           ]', 0
-cad64   defb    ' ', $12, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    ' Recovery ', $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $13, 0
-        defb    ' ', $10, ' ', $1e, ' ', $1f, '  Enter accept  Break cancel ', $10, 0
-        defb    ' ', $16, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $17, 0
-        defb    ' ', $10, 'Name                             ', $10, 0
-        defb    ' ', $10, '                                 ', $10, 0
-        defb    ' ', $10, 'Slt Siz Bnk Siz p1F p7F Flags    ', $10, 0
-        defb    ' ', $10, '                                 ', $10, 0
-        defb    ' ', $14, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
-        defb    $11, $11, $11, $11, $11, $11, $11, $15, 0, 0
-cad65   defb    'Performing...', 0
-cad66   defb    '                       ', 0
-cad67   defb    ' OK', 0
-cad68   defb    ' Er', 0
-cad69   defb    '00', 0
-cad70   defb    'Set timings', 0
-        defb    '224T if 48K', 0
-        defb    '228T if 128K', 0, 0
-cad71   defb    'Memory usually', 0
-        defb    'contended.', 0
-        defb    'Disabled on', 0
-        defb    'Pentagon 128K', 0, 0
-cad72   defb    'Performs a', 0
-        defb    'tape test', 0, 0
-cad73   defb    $1b, 0
-cad74   defb    'Kempston     Fuller', 0
-        defb    'Break key to return', 0
-        defb             '234567890'
-        defb    'Q'+$80, 'WERTYUIOP'
-        defb    'A'+$80, 'SDFGHJKLe'
-        defb    'c'+$80, 'ZXCVBNMsb'
-        defb    'o'+$80, $1c, $1d, $1e, $1f, $1f, $1e, $1d, $1c, 'o', $80
-cad75   defb    'Insert SD with', 0
-        defb    'the file on', 0
-        defb    'root', 0, 0
-cad76   defb    'Be quiet, avoid brick', 0
-cad77   defb    'SD or partition error', 0
-cad78   defb    'Not found or bad size', 0
-cad79   defb    ' Successfully burned ', 0
-cad80   defb    'EAR input', 0
-cad81   defb    'SD file', 0
-cad82   defb    'Input machine\'s name', 0
-      IF version=4
-files   defb    'ESXDOS  ZX1'
-        defb    'FIRMWAREZX1'
-        defb    'FLASH   ZX1'
-        defb    'SPECTRUMZX1'
-fileco  defb    'CORE    ZX1'
-      ELSE
-      IF version=3
-files   defb    'ESXDOS  ZZ3'
-        defb    'FIRMWAREZZ3'
-        defb    'FLASH   ZZ3'
-        defb    'SPECTRUMZZ3'
-fileco  defb    'CORE    ZZ3'
-      ELSE
-      IF version=2
-files   defb    'ESXDOS  ZZ2'
-        defb    'FIRMWAREZZ2'
-        defb    'FLASH   ZZ2'
-        defb    'SPECTRUMZZ2'
-fileco  defb    'CORE    ZZ2'
-      ELSE
-      IF version=1
-files   defb    'ESXDOS  ZXA'
-        defb    'FIRMWAREZXA'
-        defb    'FLASH   ZXA'
-        defb    'SPECTRUMZXA'
-fileco  defb    'CORE    ZXA'
+        include strings.asm
       ENDIF
-      ENDIF
-      ENDIF
-      ENDIF
-cad83   defb    'Input', 0
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, 0
-        defb    'Keyb Layout', 0
-        defb    'Joy Keypad', 0
-        defb    'Joy DB9', 0
-        defb    ' ', 0
-        defb    ' ', 0
-        defb    'Output', 0
-        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, 0
-        defb    'Video', 0
-        defb    'Scanlines', 0
-        defb    'Frequency', 0
-        defb    'CPU Speed', 0, 0
-cad84   defb    'Select PS/2', 0
-        defb    'mapping to', 0
-        defb    'spectrum', 0, 0
-cad85   defb    'Simulated', 0
-        defb    'joystick', 0
-        defb    'configuration', 0, 0
-cad86   defb    'Real joystick', 0
-        defb    'configuration', 0, 0
-cad87   defb    'Select default', 0
-        defb    'video output', 0, 0
-cad99   defb    'Enable VGA', 0
-        defb    'scanlines', 0, 0
-cad100  defb    'Set VGA', 0
-        defb    'horizontal',0
-        defb    'frequency', 0, 0
-cad101  defb    'Set CPU', 0
-        defb    'speed', 0, 0
-cad102  defb    '50', 0
-cad103  defb    '51', 0
-cad104  defb    '53.5', 0
-cad105  defb    '55.8', 0
-cad106  defb    '57.4', 0
-cad107  defb    '59.5', 0
-cad108  defb    '61.8', 0
-cad109  defb    '63.8', 0
-cad110  defb    '1X', 0
-cad111  defb    '2X', 0
-cad112  defb    '4X', 0
-cad113  defb    '8X', 0
-cad114  defb    'Break to exit', 0
-cad115  defb    'Slot occupied, select', 0
-        defb    'another or delete a', 0
-        defb    'ROM to free it', 0
-cad116  defb    '2', 0
-        defb    '3', 0
-        defb    '4', 0
-        defb    '5', 0
-        defb    '6', 0
-        defb    '7', 0
-        defb    '8', 0
-        defb    '9', 0, 0
-
-;cad199  defb    'af0000 bc0000 de0000 hl0000 sp0000 ix0000 iy0000', 0
-
-fincad
-
 ; todo
 ; * generar tablas CRC por código
 ; * descomprimir en lugar de copiar codigo alto
diff --git a/firmware/strings.asm b/firmware/strings.asm
new file mode 100644
index 0000000..303a4f2
--- /dev/null
+++ b/firmware/strings.asm
@@ -0,0 +1,377 @@
+cad0    defb    'Core:             ',0
+cad1    defm    'http://zxuno.speccy.org', 0
+        defm    'ZX-Uno BIOS v0.41', 0
+        defm    'Copyleft ', 127, ' 2016 ZX-Uno Team', 0
+        defm    'Processor: Z80 3.5MHz', 0
+        defm    'Memory:    512K Ok', 0
+        defm    'Graphics:  normal, hi-color', 0
+        defm    'hi-res, ULAplus', 0
+        defm    'Booting:', 0
+        defm    'Press <Edit> to Setup    <Break> Boot Menu', 0
+      IF  recovery=0
+cad2    defb    $12, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $13, 0
+        defm    $10, '   Please select boot machine:    ', $10, 0
+cad3    defb    $16, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $17, 0
+cad4    defm    $10, '                                  ', $10, 0
+cad5    defm    $10, '    ', $1c, ' and ', $1d, ' to move selection     ', $10, 0
+        defm    $10, '   ENTER to select boot machine   ', $10, 0
+        defm    $10, '    ESC to boot using defaults    ', $10, 0
+        defb    $14, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $15, 0
+cad6    defb    'Enter Setup', 0
+      ENDIF
+cad7    defb    ' Main  ROMs  Upgrade  Boot  Advanced  Exit', 0
+        defb    $12, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $19, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $13, 0
+cad8    defm    $10, '                         ', $10, '              ', $10, 0
+        defm    $10, 0
+cad9    defb    $14, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $18, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $15, 0
+        defb    '   BIOS v0.41    ', $7f, '2016 ZX-Uno Team', 0
+      IF  recovery=0
+cad10   defb    'Hardware tests', 0
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, 0
+        defb    $1b, ' Memory test', 0
+        defb    $1b, ' Sound test', 0
+        defb    $1b, ' Tape test', 0
+        defb    $1b, ' Input test', 0
+        defb    ' ', 0
+        defb    'Options', 0
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, 0
+        defb    'Quiet Boot', 0
+        defb    'Check CRC', 0
+        defb    'Keyboard', 0
+        defb    'Timing', 0
+        defb    'Contended', 0
+        defb    'DivMMC', 0
+        defb    'NMI-DivMMC', 0, 0
+      ENDIF
+cad11   defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $16, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $17, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0
+        defb    ' ', $10, 0, 0
+      IF  recovery=0
+cad12   defb    'Name               Slot', 0
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, 0
+        defb    $11, $11, $11, $11, 0
+      ENDIF
+cad13   defb    $1e, ' ', $1f, ' Sel.Screen', 0
+        defb    $1c, ' ', $1d, ' Sel.Item', 0
+        defb    'Enter Change', 0
+        defb    'Graph Save&Exi', 0
+        defb    'Break Exit', 0
+        defb    'N   New Entry', 0
+        defb    'R   Recovery', 0
+      IF  recovery=0
+cad14   defb    'Run a diagnos-', 0
+        defb    'tic test on', 0
+        defb    'your system', 0
+        defb    'memory', 0, 0
+cad15   defb    'Performs a', 0
+        defb    'sound test on', 0
+        defb    'your system', 0, 0
+cad16   defb    'Performs a', 0
+        defb    'keyboard &', 0
+        defb    'joystick test', 0, 0
+cad17   defb    'Hide the whole', 0
+        defb    'boot screen', 0
+        defb    'when enabled', 0, 0
+cad18   defb    'Enable RAM and', 0
+        defb    'ROM on DivMMC ', 0
+        defb    'interface.', 0
+        defb    'Ports are', 0
+        defb    'available', 0, 0
+cad19   defb    'Disable for', 0
+        defb    'better compa-', 0
+        defb    'tibility with', 0
+        defb    'SE Basic IV', 0, 0
+cad20   defb    'Behaviour of', 0
+        defb    'bit 6 on port', 0
+        defb    '$FE depends', 0
+        defb    'on hardware', 0
+        defb    'issue', 0, 0
+      ENDIF
+cad21   defb    $12, $11, $11, $11, ' Options ', $11, $11, $11, $13, 0
+cad22   defb    $10, '               ', $10, 0
+        defb    $14, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $15, 0
+      IF  recovery=0
+cad88   defb    'Spanish', 0
+cad89   defb    'English', 0
+cad90   defb    'Spectrum', 0
+cad91   defb    'Kempston', 0
+cad92   defb    'SJS1', 0
+cad93   defb    'SJS2', 0
+cad94   defb    'Protek', 0
+cad95   defb    'Fuller', 0
+cad96   defb    'PAL', 0
+cad97   defb    'NTSC', 0
+cad98   defb    'VGA', 0
+cad28   defb    'Disabled', 0
+cad29   defb    'Enabled', 0
+cad30   defb    'Issue 2', 0
+cad31   defb    'Issue 3', 0
+cadv2   defb    'Auto', 0
+cadv3   defb    '48K', 0
+cadv4   defb    '128K', 0
+cadv5   defb    'Pentagon', 0
+cad32   defb    'Move Up    q', 0
+cad33   defb    'Set Active', 0
+cad34   defb    'Move Down  a', 0
+cad35   defb    'Rename', 0
+cad36   defb    'Delete', 0
+        defb    ' ', $12, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    ' Rename ', $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $13, 0
+        defb    ' ', $10, ' ', $1e, ' ', $1f, '  Enter accept  Break cancel ', $10, 0
+        defb    ' ', $16, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $17, 0
+        defb    ' ', $10, '                                 ', $10, 0
+        defb    ' ', $14, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $15, 0
+cad38   defb    'Exit system', 0
+        defb    'setup after', 0
+        defb    'saving the', 0
+        defb    'changes', 0, 0
+cad39   defb    'Exit system', 0
+        defb    'setup without', 0
+        defb    'saving any', 0
+        defb    'changes', 0, 0
+cad40   defb    'Save Changes', 0
+        defb    'done so far to', 0
+        defb    'any of the', 0
+        defb    'setup options', 0, 0
+cad41   defb    'Discard Chan-', 0
+        defb    'ges done so', 0
+        defb    'far to any of', 0
+        defb    'the setup', 0
+        defb    'options', 0, 0
+      ENDIF
+cad45   defb    'Header:', 0
+      IF  recovery=0
+cad46   defb    $12, ' Exit Without Saving ', $11, $13, 0
+        defb    $10, '                      ', $10, 0
+        defb    $10, ' Quit without saving? ', $10, 0
+cad47   defb    $12, $11, ' Save Setup Values ', $11, $11, $13, 0
+        defb    $10, '                      ', $10, 0
+        defb    $10, '  Save configuration? ', $10, 0
+cad48   defb    $12, ' Load Previous Values ', $13, 0
+        defb    $10, '                      ', $10, 0
+        defb    $10, ' Load previous values?', $10, 0
+      ENDIF
+cad42   defb    $10, '                      ', $10, 0
+        defb    $16, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $17, 0
+        defb    $10, '      Yes     No      ', $10, 0
+cad43   defb    $14, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $15, 0
+      IF  recovery=0
+        defb    $12, $11, $11, $11, ' Save and Exit ', $11, $11, $11, $11, $13, 0
+        defb    $10, '                      ', $10, 0
+        defb    $10, '  Save conf. & Exit?  ', $10, 0
+      ENDIF
+cad44   defb    $12, $11, $11, $11, ' Load from tape ', $11, $11, $11, $13, 0
+cad445  defb    $12, $11, $11, $11, $11, ' Load from SD ', $11, $11, $11, $11, $13, 0
+        defb    $10, '                      ', $10, 0
+        defb    $10, ' Are you sure?        ', $10, 0
+      IF  recovery=0
+cad37   defb    'Save Changes & Exit', 0
+        defb    'Discard Changes & Exit', 0
+        defb    'Save Changes', 0
+        defb    'Discard Changes', 0
+      ENDIF
+cad49   defb    'Press play on', 0
+        defb    'tape & follow', 0
+        defb    'the progress', 0
+        defb    'Break to', 0
+        defb    'cancel', 0, 0
+cad50   defb    'Loading Error', 0
+cad51   defb    'Any key to return', 0
+cad52   defb    'Block 1 of 1:', 0
+cad53   defb    'Done', 0
+      IF  recovery=0
+cad54   defb    'Slot position:', 0
+cad55   defb    'Invalid CRC in ROM 0000. Must be 0000', 0
+        defb    'Press any key to continue                 ', 0
+cad56   defb    'Check CRC in', 0
+        defb    'all ROMs. Slow', 0
+        defb    'but safer', 0, 0
+      ENDIF
+cad57   defb    'Machine upgraded', 0
+cad58   defb    'BIOS upgraded', 0
+cad59   defb    'ESXDOS upgraded', 0
+cad60   defb    'Upgrade ESXDOS for ZX', 0
+cad61   defb    'Upgrade BIOS for ZX', 0
+cad615  defb    'Upgrade flash from SD', 0
+cad62   defb    'ZX Spectrum', 0
+cad63   defb    'Status:[           ]', 0
+cad64 
+      IF  recovery=0
+        defb    ' ', $12, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    ' Recovery ', $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $13, 0
+        defb    ' ', $10, ' ', $1e, ' ', $1f, '  Enter accept  Break cancel ', $10, 0
+        defb    ' ', $16, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $17, 0
+        defb    ' ', $10, 'Name                             ', $10, 0
+        defb    ' ', $10, '                                 ', $10, 0
+        defb    ' ', $10, 'Slt Siz Bnk Siz p1F p7F Flags    ', $10, 0
+        defb    ' ', $10, '                                 ', $10, 0
+        defb    ' ', $14, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11
+        defb    $11, $11, $11, $11, $11, $11, $11, $15, 0, 0
+cad65   defb    'Performing...', 0
+cad66   defb    '                       ', 0
+cad67   defb    ' OK', 0
+cad68   defb    ' Er', 0
+cad69   defb    '00', 0
+cad70   defb    'Set timings', 0
+        defb    '224T if 48K', 0
+        defb    '228T if 128K', 0, 0
+cad71   defb    'Memory usually', 0
+        defb    'contended.', 0
+        defb    'Disabled on', 0
+        defb    'Pentagon 128K', 0, 0
+cad72   defb    'Performs a', 0
+        defb    'tape test', 0, 0
+      ENDIF
+cad73   defb    $1b, 0
+      IF  recovery=0
+cad74   defb    'Kempston     Fuller', 0
+        defb    'Break key to return', 0
+        defb             '234567890'
+        defb    'Q'+$80, 'WERTYUIOP'
+        defb    'A'+$80, 'SDFGHJKLe'
+        defb    'c'+$80, 'ZXCVBNMsb'
+        defb    'o'+$80, $1c, $1d, $1e, $1f, $1f, $1e, $1d, $1c, 'o', $80
+      ENDIF
+cad75   defb    'Insert SD with', 0
+        defb    'the file on', 0
+        defb    'root', 0, 0
+cad76   defb    'Be quiet, avoid brick', 0
+cad77   defb    'SD or partition error', 0
+cad78   defb    'Not found or bad size', 0
+cad79   defb    ' Successfully burned ', 0
+cad80   defb    'EAR input', 0
+cad81   defb    'SD file', 0
+cad82   defb    'Input machine\'s name', 0
+      IF version=4
+files   defb    'ESXDOS  ZX1'
+        defb    'FIRMWAREZX1'
+        defb    'FLASH   ZX1'
+        defb    'SPECTRUMZX1'
+fileco  defb    'CORE    ZX1'
+      ELSE
+      IF version=3
+files   defb    'ESXDOS  ZZ3'
+        defb    'FIRMWAREZZ3'
+        defb    'FLASH   ZZ3'
+        defb    'SPECTRUMZZ3'
+fileco  defb    'CORE    ZZ3'
+      ELSE
+      IF version=2
+files   defb    'ESXDOS  ZZ2'
+        defb    'FIRMWAREZZ2'
+        defb    'FLASH   ZZ2'
+        defb    'SPECTRUMZZ2'
+fileco  defb    'CORE    ZZ2'
+      ELSE
+      IF version=1
+files   defb    'ESXDOS  ZXA'
+        defb    'FIRMWAREZXA'
+        defb    'FLASH   ZXA'
+        defb    'SPECTRUMZXA'
+fileco  defb    'CORE    ZXA'
+      ENDIF
+      ENDIF
+      ENDIF
+      ENDIF
+      IF  recovery=0
+cad83   defb    'Input', 0
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, 0
+        defb    'Keyb Layout', 0
+        defb    'Joy Keypad', 0
+        defb    'Joy DB9', 0
+        defb    ' ', 0
+        defb    ' ', 0
+        defb    'Output', 0
+        defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, 0
+        defb    'Video', 0
+        defb    'Scanlines', 0
+        defb    'Frequency', 0
+        defb    'CPU Speed', 0, 0
+cad84   defb    'Select PS/2', 0
+        defb    'mapping to', 0
+        defb    'spectrum', 0, 0
+cad85   defb    'Simulated', 0
+        defb    'joystick', 0
+        defb    'configuration', 0, 0
+cad86   defb    'Real joystick', 0
+        defb    'configuration', 0, 0
+cad87   defb    'Select default', 0
+        defb    'video output', 0, 0
+cad99   defb    'Enable VGA', 0
+        defb    'scanlines', 0, 0
+cad100  defb    'Set VGA', 0
+        defb    'horizontal',0
+        defb    'frequency', 0, 0
+cad101  defb    'Set CPU', 0
+        defb    'speed', 0, 0
+cad102  defb    '50', 0
+cad103  defb    '51', 0
+cad104  defb    '53.5', 0
+cad105  defb    '55.8', 0
+cad106  defb    '57.4', 0
+cad107  defb    '59.5', 0
+cad108  defb    '61.8', 0
+cad109  defb    '63.8', 0
+cad110  defb    '1X', 0
+cad111  defb    '2X', 0
+cad112  defb    '4X', 0
+cad113  defb    '8X', 0
+cad114  defb    'Break to exit', 0
+cad115  defb    'Slot occupied, select', 0
+        defb    'another or delete a', 0
+        defb    'ROM to free it', 0
+      ENDIF
+cad116  defb    '2', 0
+        defb    '3', 0
+        defb    '4', 0
+        defb    '5', 0
+        defb    '6', 0
+        defb    '7', 0
+        defb    '8', 0
+        defb    '9', 0, 0
+
+;cad199  defb    'af0000 bc0000 de0000 hl0000 sp0000 ix0000 iy0000', 0
+
+fincad