Errors with Krikzz's Mega-CD Verificator

ekeeke commented 2 years ago

When being run in Genesis Plus GX, Krikzz's Mega-CD Verificator Test ROM reports several errors:

This test ROM has been reported (by Krikzz) to run without errors on CDX/Multimega hardware.

ekeeke commented 2 years ago

Following tests have been fixed by https://github.com/ekeeke/Genesis-Plus-GX/commit/58accf068963e3dbf2d94a49256d334c3548e571: COLOR CALC : TEST 0x05 REG X002: TEST 0x29 REG 8030: TEST 0x02

ekeeke commented 2 years ago

REG 2006 TEST 0x02 fixed by https://github.com/ekeeke/Genesis-Plus-GX/commit/ee5b917c328186fc4680cca97a51339c8570b6e1 and https://github.com/ekeeke/Genesis-Plus-GX/commit/7fe8d95ca179485e53b94d45f315125e6f131f0d

DevsArchive commented 2 years ago

Just a heads up: I had a friend run the verificator on his European Model 1 MCD, and it reported this:

I do know that only NTSC seems to have been tested on krikzz's end, so the timing stuff probably is no surprise, but the CDC register thing is kind of interesting. Notably, it doesn't report back the same behavior with the supposed "RS" flag that the verificator's source code mentions. Originally, I had a PR that addressed this along with a couple other things, but this kinda complicates this a bit, in my opinion.

ekeeke commented 2 years ago

Yes, this test was confirmed as not working on most Sega CD / Mega CD models by Blastem author (see http://gendev.spritesmind.net/forum/viewtopic.php?f=5&t=3166&start=25) so I suspect it only works on the specific CDC model (LC8913) used in CDX/Multimega and X-Eye/Wondermega M2. If you look at the (very limited) LC8913 datasheet, it seems there are some additional configuration (double/quad speed playback, configurable CD input stream format,...) that are not mentionned in the other chips of same family (LC89510 and LC89515) used in Model 1 / Model 2 hardware so it is quite possible this particular chip model extends the number of available registers and use 5 bits for Address Register.

DevsArchive commented 2 years ago

Ah, I didn't see that thread before, completely flew under my radar somehow. Glad to know.

ekeeke commented 10 months ago

REG X002 test 0x03 and WORD RAM test 0x20 fixed by https://github.com/ekeeke/Genesis-Plus-GX/commit/6cc8bbc2776dfbe62411fc1e8fbc5807c8e3558d (intially fixing issue #482)

ekeeke commented 10 months ago

REG X002 test 0x2B fixed by https://github.com/ekeeke/Genesis-Plus-GX/commit/6669d259480bd686b388a313c50e6d43733f2e4e

ekeeke commented 10 months ago

CDC INIT test 0x04 and CDC DMA3 test 0x02 fixed by https://github.com/ekeeke/Genesis-Plus-GX/commit/b330eb85cfd5b8afea6c2609438151a60e399334

ekeeke commented 10 months ago

all CDC REGS tests fixed by https://github.com/ekeeke/Genesis-Plus-GX/commit/fcb66202025662a35bda6772d1dac2105e3f0b96

Note: Wondermega M2, X'Eye, CDX or Multi-Mega BIOS is needed for these tests to run OK (with real hardware, these tests only pass on these models, cf comments above)