diff options
Diffstat (limited to 'vdp.c')
| -rw-r--r-- | vdp.c | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -3953,6 +3953,20 @@ uint16_t vdp_data_port_read(vdp_context * context) } if (context->cd & 1) { warning("Read from VDP data port while writes are configured, CPU is now frozen. VDP Address: %X, CD: %X\n", context->address, context->cd); + context->system->enter_debugger = 1; + return context->prefetch; + } + switch (context->cd) + { + case VRAM_READ: + case VSRAM_READ: + case CRAM_READ: + case VRAM_READ8: + break; + default: + warning("Read from VDP data port with invalid source, CPU is now frozen. VDP Address: %X, CD: %X\n", context->address, context->cd); + context->system->enter_debugger = 1; + return context->prefetch; } while (!(context->flags & FLAG_READ_FETCHED)) { vdp_run_context_full(context, context->cycles + ((context->regs[REG_MODE_4] & BIT_H40) ? 16 : 20)); |