diff --git a/firmware/FIRMWARE.ZX1 b/firmware/FIRMWARE.ZX1
index f4e69b7..9081fa0 100644
Binary files a/firmware/FIRMWARE.ZX1 and b/firmware/FIRMWARE.ZX1 differ
diff --git a/firmware/FIRMWARE.ZX2 b/firmware/FIRMWARE.ZX2
index c489189..0fa7c03 100644
Binary files a/firmware/FIRMWARE.ZX2 and b/firmware/FIRMWARE.ZX2 differ
diff --git a/firmware/FIRMWARE.ZX3 b/firmware/FIRMWARE.ZX3
index 9546fe1..66b83a8 100644
Binary files a/firmware/FIRMWARE.ZX3 and b/firmware/FIRMWARE.ZX3 differ
diff --git a/firmware/FIRMWARE.ZXD b/firmware/FIRMWARE.ZXD
index 6be80c0..9aef91d 100644
Binary files a/firmware/FIRMWARE.ZXD and b/firmware/FIRMWARE.ZXD differ
diff --git a/firmware/firmware.asm b/firmware/firmware.asm
index b11e344..523243f 100644
--- a/firmware/firmware.asm
+++ b/firmware/firmware.asm
@@ -2238,21 +2238,18 @@ tosd3   inc     hl
         ldi
         ldi
 tosd4   sub     3
-        ld      hl, fileco+4
+        ld      hl, fileco+5
 tosd45  inc     b
         sub     10
         jr      nc, tosd45
         add     a, 10+$30
         ld      (hl), a
-        inc     l
-        ld      (hl), ' '
         djnz    tosd46
         cp      '1'
-        jr      nz, tosd5
+        jr      nz, tosd46
         dec     (ix+$1c)
         jr      tosd5
-tosd46  ld      (hl), a
-        dec     l
+tosd46  dec     l
         ld      a, b
         add     a, $30
         ld      (hl), a
@@ -2532,7 +2529,6 @@ calc2   rrca
         pop     bc
         ret
 
-
 buba    push    bc
         push    de
         push    hl
@@ -2543,8 +2539,17 @@ bubi    push    bc
         ld      a, (hl)
         or      a
         jr      z, sali
-        ld      de, (tmpbu2+$1a)
+        cp      'C'
         push    hl
+        jr      nz, noco
+        ld      de, 6
+        add     hl, de
+        ld      (hl), ' '
+        inc     hl
+        ld      (hl), ' '
+        pop     hl
+        push    hl
+noco    ld      de, (tmpbu2+$1a)
 buub    ld      a, (de)
         cp      (hl)
         inc     hl
diff --git a/firmware/strings.asm b/firmware/strings.asm
index ff5a158..4441422 100644
--- a/firmware/strings.asm
+++ b/firmware/strings.asm
@@ -4,7 +4,7 @@ cad1    defb    'http://zxuno.speccy.org', 0
       ELSE
 cad1    defb    'http://zxdos.forofpga.es', 0
       ENDIF
-        defb    'ZX-Uno BIOS v0.79', 0
+        defb    'ZX-Uno BIOS v0.80', 0
         defb    'Copyleft ', 127, ' 2020 ZX-Uno Team', 0
         defb    'Processor: Z80 3.5MHz', 0
         defb    'Memory:    '
@@ -41,7 +41,7 @@ cad8    defb    $10, '                         ', $10, '              ', $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 v0.79    ', $7f, '2020 ZX-Uno Team', 0
+        defb    '   BIOS v0.80    ', $7f, '2020 ZX-Uno Team', 0
       ELSE
         defb    'Press <Edit> to Setup',0
         defb    '      <Break> Boot Menu', 0
@@ -72,7 +72,7 @@ cad8    defb    $10, '                              ', $10, 0
 cad9    defb    $14, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
         defb    $11, $11, $11, $11
         defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $15, 0
-        defb    ' BIOS v0.79 ', $7f, '2020 ZX1 Team', 0
+        defb    ' BIOS v0.80 ', $7f, '2020 ZX1 Team', 0
         defs    $66
       ENDIF
 cad10   defb    'Hardware tests', 0