diff options
| author | Mike Pavone <pavone@retrodev.com> | 2013-05-06 00:54:58 -0700 |
|---|---|---|
| committer | Mike Pavone <pavone@retrodev.com> | 2013-05-06 00:54:58 -0700 |
| commit | 3eb77ade74ef4fe9f8a7e1eb59e56010a3de778e (patch) | |
| tree | db3afb7611ddbb45cd099bd867b826200a3631fb /zruntime.S | |
| parent | 8fa8eb29bee9153853949f7d9193b47911247f39 (diff) | |
Implement writes from Z80 to YM-2612
Diffstat (limited to 'zruntime.S')
| -rw-r--r-- | zruntime.S | 24 |
1 files changed, 23 insertions, 1 deletions
@@ -90,6 +90,8 @@ z80_read_byte_noinc: jb z80_read_ram cmp $0x8000, %r13w jae z80_read_bank + cmp $0x6000, %r13w + jb z80_read_ym2612 /* TODO: Bank reg, YM-2612, PSG/VDP */ mov $0xFF, %r13b ret @@ -108,6 +110,15 @@ z80_read_bank: slow_bank_read: /* TODO: Call into C to implement this */ ret +z80_read_ym2612: + call z80_save_context + mov %r13w, %di + push %rsi + call z80_read_ym + pop %rsi + mov %al, %r13b + call z80_load_context + ret .global z80_write_byte z80_write_byte: @@ -118,7 +129,9 @@ z80_write_byte_noinc: cmp $0x8000, %r14w jae z80_write_bank cmp $0x6000, %r14w - je z80_write_bank_reg + jb z80_write_ym2612 + cmp $0x6100, %r14w + jb z80_write_bank_reg /* TODO: YM-2612, PSG/VDP */ ret z80_write_ram: @@ -146,6 +159,15 @@ z80_write_bank: slow_bank_write: /* TODO: Call into C to implement this */ ret +z80_write_ym2612: + and $0x3, %r14w + call z80_save_context + mov %r14w, %di + mov %r13b, %dl + call z80_write_ym + mov %rax, %rsi + call z80_load_context + ret z80_write_bank_reg: and $1, %r13w shr %r15w |