diff options
| -rw-r--r-- | blastem.c | 15 |
1 files changed, 11 insertions, 4 deletions
@@ -666,12 +666,15 @@ uint8_t z80_read_ym(uint32_t location, void * vcontext) uint8_t z80_read_bank(uint32_t location, void * vcontext) { z80_context * context = vcontext; + genesis_context *gen = context->system; + if (gen->bus_busy) { + context->current_cycle = context->sync_cycle; + } //typical delay from bus arbitration context->current_cycle += 3 * MCLKS_PER_Z80; + //TODO: add cycle for an access right after a previous one location &= 0x7FFF; - //TODO: add cycle for an access right after a previous one - //TODO: block Z80 if VDP has the bus or the 68K is blocked on a VDP access if (context->mem_pointers[1]) { return context->mem_pointers[1][location ^ 1]; } @@ -687,11 +690,15 @@ uint8_t z80_read_bank(uint32_t location, void * vcontext) void *z80_write_bank(uint32_t location, void * vcontext, uint8_t value) { z80_context * context = vcontext; + genesis_context *gen = context->system; + if (gen->bus_busy) { + context->current_cycle = context->sync_cycle; + } //typical delay from bus arbitration context->current_cycle += 3 * MCLKS_PER_Z80; - location &= 0x7FFF; //TODO: add cycle for an access right after a previous one - //TODO: block Z80 if VDP has the bus or the 68K is blocked on a VDP access + + location &= 0x7FFF; uint32_t address = context->bank_reg << 15 | location; if (address >= 0xE00000) { address &= 0xFFFF; |