add support for older powerhsell

README.md

@@ -146,7 +146,9 @@ In the video starting at 35m 19s, there was a section where a speedrunner named
 `dk28` died in the middle of level 1, and was advanced to level 2 for their next
 life.  The video explains that there still isn't a known explanation as to why
 this happened.  This got me interested in the assembly and thus this project
-began and has since changed in scope as my interest have changed.
+began.  Spoilers, I have not found the cause of the level skip bug.  It is still
+unknown whether the bug is from some bug in the code, or whether it was a
+hardware glitch.
 
 The _Contra_ (US) NES ROM was disassembled using a NES disassembly tool. This
 provided a starting point for code investigation.  The disassembler incorrectly

build.ps1

@@ -21,11 +21,20 @@ function Set-Bytes {
     # only read baserom.nes once for speed improvements
     IF ($global:SOURCE_CONTRA -eq $null) {
         Write-Output "    Reading input file baserom.nes."
-        $global:SOURCE_CONTRA = Get-Content .\baserom.nes -AsByteStream
+        IF ($PSVersionTable.PSVersion.Major -ge 6) {
+            $global:SOURCE_CONTRA = Get-Content .\baserom.nes -AsByteStream
+        } ELSE {
+            $global:SOURCE_CONTRA = Get-Content .\baserom.nes -Raw -Encoding Byte
+        }
     }
 
     Write-Output "    Writing file $Output."
-    $global:SOURCE_CONTRA | Select-Object -Skip $Skip -First $Take | Set-Content $Output -AsByteStream
+    
+    IF ($PSVersionTable.PSVersion.Major -ge 6) {
+        $global:SOURCE_CONTRA | Select-Object -Skip $Skip -First $Take | Set-Content $Output -AsByteStream
+    } ELSE {
+        $global:SOURCE_CONTRA | Select-Object -Skip $Skip -First $Take | Set-Content $Output -Encoding Byte
+    }
 }
 
 IF (Test-Path -Path "contra.nes") {