diff options
| -rw-r--r-- | blastem.c | 6 |
1 files changed, 4 insertions, 2 deletions
@@ -253,8 +253,8 @@ m68k_context * vdp_port_write(uint32_t vdp_port, m68k_context * context, uint16_ vdp_context * v_context = context->video_context; if (vdp_port < 0x10) { int blocked; + uint32_t before_cycle = v_context->cycles; if (vdp_port < 4) { - uint32_t before_cycle = v_context->cycles; while (vdp_data_port_write(v_context, value) < 0) { while(v_context->flags & FLAG_DMA_RUN) { vdp_run_dma_done(v_context, mclks_per_frame); @@ -314,7 +314,9 @@ m68k_context * vdp_port_write(uint32_t vdp_port, m68k_context * context, uint16_ printf("Illegal write to HV Counter port %X\n", vdp_port); exit(1); } - context->current_cycle = v_context->cycles/MCLKS_PER_68K; + if (v_context->cycles != before_cycle) { + context->current_cycle = v_context->cycles / MCLKS_PER_68K; + } } else if (vdp_port < 0x18) { //TODO: Implement PSG } else { |