Mercurial > repos > blastem
diff lc8951.c @ 2419:0871f555eff6
Fix some CD-ROM emulation issues and make timing better match my MCD2. Seems to fix or at least improve video playback in Iron Helix and Power Rangers
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Thu, 18 Jan 2024 23:03:58 -0800 |
| parents | f8b5142c06aa |
| children | 0775f5e0c468 |
line wrap: on
line diff
--- a/lc8951.c Wed Jan 17 23:51:37 2024 -0800 +++ b/lc8951.c Thu Jan 18 23:03:58 2024 -0800 @@ -56,6 +56,7 @@ //CTRL0 #define BIT_DECEN 0x80 +#define BIT_EDCRQ 0x40 #define BIT_WRRQ 0x04 #define BIT_ORQ 0x02 #define BIT_PRQ 0x01 @@ -240,11 +241,12 @@ uint16_t block_start = (context->regs[PTL] | (context->regs[PTH] << 8)) & (sizeof(context->buffer)-1); for (int reg = HEAD0; reg < PTL; reg++) { + printf("Setting header reg %X to %X: %X\n", reg, block_start, context->buffer[block_start]); context->regs[reg] =context->buffer[block_start++]; block_start &= (sizeof(context->buffer)-1); } } - printf("Decode done %X:%X:%X mode %X\n", context->regs[HEAD0], context->regs[HEAD1], context->regs[HEAD2], context->regs[HEAD3]); + printf("Decode done %X:%X:%X mode %X @ %u\n", context->regs[HEAD0], context->regs[HEAD1], context->regs[HEAD2], context->regs[HEAD3], context->cycle); // This check is a hack until I properly implement error detection if (context->regs[HEAD0] < 0x74 && (context->regs[HEAD0] & 0xF) < 0xA && context->regs[HEAD1] < 0x60 && (context->regs[HEAD1] & 0xF) < 0xA @@ -258,7 +260,7 @@ context->regs[STAT1] = 0; context->regs[STAT2] = 0x10; } else { - if (context->ctrl0 & (BIT_WRRQ|BIT_ORQ|BIT_PRQ)) { + if (context->ctrl0 & (BIT_EDCRQ|BIT_ORQ|BIT_PRQ)) { context->regs[STAT0] |= BIT_UCEBLK; } context->regs[STAT1] = 0xFF; @@ -341,7 +343,19 @@ if ((context->ctrl0 & (BIT_DECEN|BIT_WRRQ)) == (BIT_DECEN)) { //monitor only mode context->regs[HEAD0 + context->sector_counter] = byte; + if (context->sector_counter == 3) { + printf("Monitoring sector %02d:%02d:%02d\n", context->regs[HEAD0], context->regs[HEAD1], context->regs[HEAD2]); + } + } else { + if (context->sector_counter == 3) { + printf("Writing sector %02d:%02d:%02d @ %u\n", + context->buffer[(current_write_addr - 3) & (sizeof(context->buffer)-1)], + context->buffer[(current_write_addr - 2) & (sizeof(context->buffer)-1)], + context->buffer[(current_write_addr - 1) & (sizeof(context->buffer)-1)], + context->cycle); + } } + } if (sync_detected || sync_inserted) { @@ -369,9 +383,10 @@ context->regs[PTL] = block_start; context->regs[PTH] = block_start >> 8; } - printf("Decoding block starting at %X (WRRQ: %d, sector_offset: %X)\n", context->regs[PTL] | (context->regs[PTH] << 8), !!(context->ctrl0 & BIT_WRRQ), sector_offset); - //Based on measurements of a Wondermega M1 (LC8951) with SYDEN, SYIEN and DECEN only - context->decode_end = context->cycle + 22030 * context->clock_step; + printf("Decoding block starting at %X (WRRQ: %d, sector_offset: %X), current write address: %X @ %u\n", context->regs[PTL] | (context->regs[PTH] << 8), !!(context->ctrl0 & BIT_WRRQ), sector_offset, current_write_addr, context->cycle); + //Based on mcd-verificator results on an MCD2 with LC89515 + //value seems to be between ~132500 and ~133500 + context->decode_end = context->cycle + 133000 * context->clock_step; } } else { context->sector_counter++;