diff options
| -rw-r--r-- | vdp.c | 9 |
1 files changed, 4 insertions, 5 deletions
@@ -3755,6 +3755,10 @@ int vdp_control_port_write(vdp_context * context, uint16_t value) if ((value & 0xC000) == 0x8000) { //Register write uint8_t reg = (value >> 8) & 0x1F; + // The fact that this is needed seems to pour some cold water on my theory + // about how the address latch actually works. Needs more search to definitively confirm + context->address = (context->address & 0x1C000) | (value & 0x3FFF); + context->cd = (context->cd & 0x3C) | (value >> 14); if (reg < (mode_5 ? VDP_REGS : 0xB)) { //printf("register %d set to %X\n", reg, value & 0xFF); if (reg == REG_MODE_1 && (value & BIT_HVC_LATCH) && !(context->regs[reg] & BIT_HVC_LATCH)) { @@ -3779,11 +3783,6 @@ int vdp_control_port_write(vdp_context * context, uint16_t value) update_video_params(context); } } - // The fact that this is needed seems to pour some cold water on my theory - // about how the address latch actually works. Needs more search to definitively confirm - clear_pending(context); - context->flags &= ~FLAG_READ_FETCHED; - context->flags2 &= ~FLAG2_READ_PENDING; } else if (mode_5) { context->flags |= FLAG_PENDING; //Should these be taken care of here or after the second write? |