first commit

boot_debug.s

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+; Debug Bootblock - Green Screen Loop
+    MACHINE 68000
+    ORG 0
+
+    dc.b    'D','O','S',0       ; DOS magic
+    dc.l    0                   ; Checksum
+    dc.l    880                 ; Rootblock
+
+; Boot code
+DMACON  EQU $096
+COLOR00 EQU $180
+
+boot_start:
+    ; Direct hardware access to set color
+    lea     $dff000,a6          ; Custom Chips Base
+    
+    ; Disable DMA to be safe
+    move.w  #$7FFF,DMACON(a6)
+    
+    ; Set Background Color to GREEN
+    move.w  #$0F0,COLOR00(a6)
+    
+.loop:
+    ; Infinite loop
+    bra.s   .loop
+
+; Pad to 1024 bytes
+    dcb.b   1024-(*-0),0