first commit

make_adf.ps1

@@ -0,0 +1,63 @@
+$bootFile = "boot.bin"
+$gameFile = "game.bin"
+$adfFile = "giochino.adf"
+
+# Read Bootblock
+$bootBytes = [System.IO.File]::ReadAllBytes($bootFile)
+if ($bootBytes.Length -lt 1024) {
+    $padding = New-Object byte[] (1024 - $bootBytes.Length)
+    $bootBytes = $bootBytes + $padding
+}
+$bootBytes = [byte[]]$bootBytes
+
+# Calculate Checksum
+# Checksum is at offset 4 (4 bytes)
+# Clear it first
+$bootBytes[4] = 0
+$bootBytes[5] = 0
+$bootBytes[6] = 0
+$bootBytes[7] = 0
+
+$chk = [uint32]0
+for ($i = 0; $i -lt 1024; $i += 4) {
+    # Big Endian ULONG
+    [uint32]$val = ([uint32]$bootBytes[$i] -shl 24) -bor ([uint32]$bootBytes[$i + 1] -shl 16) -bor ([uint32]$bootBytes[$i + 2] -shl 8) -bor [uint32]$bootBytes[$i + 3]
+    
+    # Add with carry handling
+    [uint64]$temp = [uint64]$chk + [uint64]$val
+    if ($temp -gt 4294967295) {
+        $chk = [uint32](($temp -band 4294967295) + 1)
+    }
+    else {
+        $chk = [uint32]$temp
+    }
+}
+
+# NOT operation
+$chk = $chk -bxor 4294967295
+
+Write-Host "Checksum: $("0x{0:X}" -f $chk)"
+
+# Write Checksum back (Big Endian)
+$bootBytes[4] = ($chk -shr 24) -band 0xFF
+$bootBytes[5] = ($chk -shr 16) -band 0xFF
+$bootBytes[6] = ($chk -shr 8) -band 0xFF
+$bootBytes[7] = $chk -band 0xFF
+
+# Read Game
+$gameBytes = [System.IO.File]::ReadAllBytes($gameFile)
+Write-Host "Game Size: $($gameBytes.Length) bytes"
+
+# Create ADF (880KB)
+$adfSize = 880 * 1024
+$adfBytes = New-Object byte[] $adfSize
+
+# Copy Bootblock
+[System.Array]::Copy($bootBytes, 0, $adfBytes, 0, 1024)
+
+# Copy Game (Offset 1024)
+[System.Array]::Copy($gameBytes, 0, $adfBytes, 1024, $gameBytes.Length)
+
+# Save ADF
+[System.IO.File]::WriteAllBytes($adfFile, $adfBytes)
+Write-Host "Created $adfFile"