mirror of
https://github.com/MiSTer-devel/CDi_MiSTer.git
synced 2026-04-19 03:04:19 +00:00
22cb55b4f7
Extended the available memory by 1.5MB According to memory map of MAME Allows playing "The Apprentice" with SFX
90 lines
1.6 KiB
NASM
90 lines
1.6 KiB
NASM
section .text
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org $400000
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vector:
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dc.l $301000 ; Use CDIC memory for stack
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dc.l main
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dc.l 0,0
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main:
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;DRAM Bank 0 Lower 256kB -> 0x000000 to 0x03ffff
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;DRAM Bank 1 Lower 256kB -> 0x040000 to 0x07FFFF
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move.l #0,a0
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move.l #(1024*512/4),d1
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move.b #'a',$80002019
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jsr memwrite
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;DRAM Bank 0 Upper 256kB -> 0x080000 to 0x0BFFFF
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;DRAM Bank 1 Upper 256kB -> 0x0C0000 to 0x0FFFFF
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move.l #$200000,a0
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move.l #(1024*512/4),d1
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move.b #'b',$80002019
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jsr memwrite
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;DVC RAM block 1 (according to mame) 1MB
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move.l #$d00000,a0
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move.l #(1024*1024/4),d1
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move.b #'c',$80002019
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jsr memwrite
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;DVC RAM block 2 (according to mame) 512kB
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move.l #$e80000,a0
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move.l #(1024*512/4),d1
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move.b #'d',$80002019
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jsr memwrite
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;DRAM Bank 0 Lower 256kB -> 0x000000 to 0x03ffff
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;DRAM Bank 1 Lower 256kB -> 0x040000 to 0x07FFFF
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move.l #0,a0
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move.l #(1024*512/4),d1
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move.b #'A',$80002019
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jsr memcmp
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;DRAM Bank 0 Upper 256kB -> 0x080000 to 0x0BFFFF
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;DRAM Bank 1 Upper 256kB -> 0x0C0000 to 0x0FFFFF
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move.l #$200000,a0
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move.l #(1024*512/4),d1
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move.b #'B',$80002019
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jsr memcmp
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;DVC RAM block 1 (according to mame) 1MB
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move.l #$d00000,a0
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move.l #(1024*1024/4),d1
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move.b #'C',$80002019
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jsr memcmp
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;DVC RAM block 2 (according to mame) 512kB
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move.l #$e80000,a0
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move.l #(1024*512/4),d1
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move.b #'D',$80002019
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jsr memcmp
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move.b #'G',$80002019
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endless:
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bra endless
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memwrite:
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move.l a0,d0
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move.l d0,(a0)
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add.l #4,a0
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add.l #-1,d1
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bne memwrite
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rts
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memcmp:
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move.l a0,d0
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cmp.l (a0),d0
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bne error
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add.l #4,a0
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add.l #-1,d1
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bne memcmp
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rts
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error:
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move.b #'Z',$80002019
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bra endless
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