Mercurial > repos > blastem
comparison blastem.c @ 357:fa7ea48be9a9
Allow VDP/PSG writes from Z80
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Fri, 24 May 2013 00:26:27 -0700 |
| parents | 79e4b466e7d0 |
| children | 9498cfa7f7c8 |
comparison
equal
deleted
inserted
replaced
| 356:79e4b466e7d0 | 357:fa7ea48be9a9 |
|---|---|
| 331 return context; | 331 return context; |
| 332 } | 332 } |
| 333 | 333 |
| 334 m68k_context * vdp_port_write_b(uint32_t vdp_port, m68k_context * context, uint8_t value) | 334 m68k_context * vdp_port_write_b(uint32_t vdp_port, m68k_context * context, uint8_t value) |
| 335 { | 335 { |
| 336 return vdp_port_write(vdp_port, context, vdp_port < 0x10 ? value | value << 8 : value); | 336 return vdp_port_write(vdp_port, context, vdp_port < 0x10 ? value | value << 8 : ((vdp_port & 1) ? value : 0)); |
| 337 } | |
| 338 | |
| 339 z80_context * z80_vdp_port_write(uint16_t vdp_port, z80_context * context, uint8_t value) | |
| 340 { | |
| 341 genesis_context * gen = context->system; | |
| 342 vdp_port_write_b(vdp_port, gen->m68k, value); | |
| 343 return context; | |
| 337 } | 344 } |
| 338 | 345 |
| 339 uint16_t vdp_port_read(uint32_t vdp_port, m68k_context * context) | 346 uint16_t vdp_port_read(uint32_t vdp_port, m68k_context * context) |
| 340 { | 347 { |
| 341 if (vdp_port & 0x2700E0) { | 348 if (vdp_port & 0x2700E0) { |