Created
January 27, 2023 10:50
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Template for Mattel Aquarius extension ROM (with header signature)
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| ; Basic template of a Mattel Aquarius extension ROM | |
| ; build: z80asm -o aq_romext.bin aq_romext.asm | |
| ; run: mame aquariusp -bp . -cart1 aq_romext.bin | |
| ; uncomment the following block to create a 16K ROM | |
| ;org 0xc000 | |
| ; ... | |
| ; ### lower part of a 16K ROM ### | |
| ; ... | |
| ; ds 0xe000 - $ | |
| ; ### Header ### | |
| ; can be customized | |
| H0: equ 0 | |
| H1: equ 0 | |
| H2: equ 0 | |
| H3: equ 0 | |
| H4: equ 0 | |
| H6: equ 0 | |
| H8: equ 0 | |
| HA: equ 0 | |
| HC: equ 0 | |
| ; signature: fixed values | |
| H5: equ 0x9c | |
| H7: equ 0xb0 | |
| H9: equ 0x6c | |
| HB: equ 0x64 | |
| HD: equ 0xA8 | |
| HF: equ 0x70 | |
| HE: equ (HF - 0x4e - (H3 + H4 + H5 + H6 + H7 + H8 + H9 + HA + HB + HC + HD)) & 0xff | |
| if H3 == 0xf7 | |
| error | |
| endif | |
| org 0xe000 | |
| ; ROM signature | |
| db H0 | |
| db H1 | |
| db H2 | |
| db H3 | |
| db H4 | |
| db H5 | |
| db H6 | |
| db H7 | |
| db H8 | |
| db H9 | |
| db HA | |
| db HB | |
| db HC | |
| db HD | |
| db HE | |
| db HF | |
| ; ### high part of the ROM ### | |
| PRNCHR: equ 0x1d94 | |
| start: | |
| ld a,'@' | |
| call PRNCHR | |
| hang: | |
| jp hang | |
| ds 0x10000 - $ ; pad to the ROM size |
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Thanks. Makes so much more sense.