CD-ROM Commands With No Disc: Difference between revisions
| Revision as of 05:18, 23 October 2026 RemmyLee (Hardware tests: nine DMA, MDEC and BIOS test pages with part names for titles; join one-sentence paragraphs per voice.md) | Revision as of 05:26, 23 October 2026 RemmyLee (Hardware tests: cross-link the two CD-ROM no-disc pages and the two GTE input timing pages, with the measured step sizes) | ||
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| ## Overview | ## Overview | ||
| − | With the lid open and no disc in the drive, the program sends each [CD-ROM command](/hardware/cd-rom/commands/) in turn and records the interrupt type and the response bytes. It times each answer from the command write in cycles at 33.8688 MHz, counted on root counter 2 at one eighth of that clock. After the commands it reads the controller's RAM with Test 19h,60h.[^run] | + | With the lid open and no disc in the drive, the program sends each [CD-ROM command](/hardware/cd-rom/commands/) in turn and records the interrupt type and the response bytes. It times each answer from the command write in cycles at 33.8688 MHz, counted on root counter 2 at one eighth of that clock. After the commands it reads the controller's RAM with Test 19h,60h.[^run] [CD-ROM Controller With No Disc](/tests/cd-rom-no-disc/) sends the same commands with 0 to 3 parameters each and also tests the FIFOs, the registers and Reset. The two programs got the same answers. |
| ## Results | ## Results | ||