| ID | Category [?] | Severity [?] | Reproducibility | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 06769 | Core | Major | Always | Nov 21, 2017, 16:08 | 8 hours ago |
| Tester | demotester | View Status | Public | Platform | MAME (Official Binary) |
| Assigned To | AJR | Resolution | Fixed | OS | Other |
| Status [?] | Resolved | Driver | |||
| Version | 0.191 | Fixed in Version | 0.287GIT | Build | Other |
| Fixed in Git Commit | 3ceb5aa | Github Pull Request # | |||
| Summary |
 06769: bbcm: BCD test failed on 65SC02 |
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| Description |
B-Em forum -> http://www.stardot.org.uk/forums/viewtopic.php?f=4&t=10823&start=240#p166332 The latest branch of B-Em WinBuild -> http://www.stardot.org.uk/forums/download/file.php?id=28847 The latest branch of B-Em has fixed 65SC02 BCD -> so BBC Master emu passes 65SC02 BCD test in "6502test.ssd"! Note: "6502test.ssd" find inside the disc folder! |
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| Steps To Reproduce |
How to run "6502test.ssd" on MAME bbcm driver: Mount the disc on bbcm driver and press SHIFT+F12 keys! When run the "6502test.ssd" in MAME bbcm driver, the CPU is detected as 65C02 instead of 65SC02? Also, the Basic BCD test with 6502 and 65C02 passes but fails with 65SC02! According to this, the BBC Master driver in MAME seems does not using 65SC02 CPU! (as other emus do) In MAME bbcm driver "Machine Information" it says: 65SC02 2MHz! |
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| Additional Information | |||||
| Github Commit | |||||
| Flags | |||||
| Regression Version | |||||
| Affected Sets / Systems | bbcm | ||||
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Attached Files
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 mame_bbcm_6502test.png (6,400 bytes) Nov 21, 2017, 18:35 Uploaded by demotesterMAME bbcm test detection!
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 No.14457
hap Developer
Nov 22, 2017, 17:37
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I don't know why autodetection goes wrong. But the reason the BCD test fails on 65C02 is because ADC/SBC decimal mode is slightly different on CMOS CPUs. MAME doesn't emulate this difference. I didn't look into it further (don't know the exact differences) |
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 No.24269
AJR Developer
12 hours ago
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3ceb5aaeaad1f4207baa70e2461ce64fdb90b236 makes all BCD tests pass for me. Note that the SSD I could find successfully detects 65SC02 on bbcm: https://github.com/mungre/beeb6502test/blob/master/6502test.ssd |