diff options
| -rw-r--r-- | genesis.c | 6 | ||||
| -rw-r--r-- | vdp.c | 6 | ||||
| -rw-r--r-- | vdp.h | 1 |
3 files changed, 5 insertions, 8 deletions
@@ -648,7 +648,7 @@ static uint16_t vdp_port_read(uint32_t vdp_port, m68k_context * context) } else if (vdp_port < 0x18){ fatal_error("Illegal read from PSG port %X\n", vdp_port); } else { - value = vdp_test_port_read(v_context); + value = get_open_bus_value(&gen->header); } if (v_context->cycles != before_cycle) { //printf("68K paused for %d (%d) cycles at cycle %d (%d) for read\n", v_context->cycles - context->current_cycle, v_context->cycles - before_cycle, context->current_cycle, before_cycle); @@ -1012,6 +1012,10 @@ static uint8_t z80_read_bank(uint32_t location, void * vcontext) uint32_t address = gen->z80_bank_reg << 15 | location; if (address >= 0xC00000 && address < 0xE00000) { return z80_vdp_port_read(location & 0xFF, context); + } else if (address >= 0xA10000 && address <= 0xA10001) { + //Apparently version reg can be read through Z80 banked area + //TODO: Check rest of IO region addresses + return gen->version_reg; } else { fprintf(stderr, "Unhandled read by Z80 from address %X through banked memory area (%X)\n", address, gen->z80_bank_reg << 15); } @@ -3631,12 +3631,6 @@ uint8_t vdp_data_port_read_pbc(vdp_context * context) return context->prefetch; } -uint16_t vdp_test_port_read(vdp_context * context) -{ - //TODO: Find out what actually gets returned here - return context->test_port; -} - void vdp_adjust_cycles(vdp_context * context, uint32_t deduction) { context->cycles -= deduction; @@ -254,7 +254,6 @@ uint16_t vdp_data_port_read(vdp_context * context); uint8_t vdp_data_port_read_pbc(vdp_context * context); void vdp_latch_hv(vdp_context *context); uint16_t vdp_hv_counter_read(vdp_context * context); -uint16_t vdp_test_port_read(vdp_context * context); void vdp_adjust_cycles(vdp_context * context, uint32_t deduction); uint32_t vdp_next_hint(vdp_context * context); uint32_t vdp_next_vint(vdp_context * context); |