CD-ROM Commands With No Disc: Difference between revisions
| Revision as of 05:40, 23 October 2026 RemmyLee (Hardware tests: 15 more test pages (CPU, DMA, SPU, GPU, MDEC, CD-ROM, bus), each with See also links to the pages that measure the same parts) | Revision as of 05:41, 23 October 2026 RemmyLee (Hardware tests: See also links back from 37 existing pages to the new ones) | ||
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| 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. | 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. | ||
| + | See also: | ||
| + | |||
| + | - [CD-ROM Audio and Data Commands](/tests/cd-rom-audio-data-commands/) | ||
| + | |||
| ## Results | ## Results | ||