| ID | Category [?] | Severity [?] | Reproducibility | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 08464 | Core | Critical (emulation) | Always | Oct 23, 2022, 04:47 | Oct 25, 2022, 14:43 |
| Tester | pnp2084 | View Status | Public | Platform | MAME (Official Binary) |
| Assigned To | pnp2084 | Resolution | Fixed | OS | Windows 10/11 (64-bit) |
| Status [?] | Resolved | Driver | |||
| Version | 0.248 | Fixed in Version | 0.250 | Build | 64-bit |
| Fixed in Git Commit | 99b3304 | Github Pull Request # | #10464 | ||
| Summary | 08464: trs80l2: Game boot loader fails due to overlapping FDC commands | ||||
| Description |
The two attached graphic adventures have a custom boot loader which does not work on the TRS-80 Model I emulation. The games fail to start. (It does work for the Model 3 emulation but that different boot code) |
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| Steps To Reproduce |
Try to boot any of the two games. DISK ERROR will appear instead of a splash screen.mame trs80l2 -flop1 spook_house.mfiOr: mame trs80l2 -flop1 sledge.mfi |
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| Additional Information |
The ROM boot loader immediately jumps to $4200 but the read sector command is not finished. The boot sector code issues a step command. The FDC emulation accepts the command (with a delay) and sets the busy bit. But when the previous read command finishes, BSY is cleared before the delayed step command starts. As a result, the boot code sees the STEP command finish, putting the boot code in an inconsistent state. |
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| Github Commit | |||||
| Flags | |||||
| Regression Version | |||||
| Affected Sets / Systems | trs80l2 | ||||
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Attached Files
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 graphic_adventure.zip (112,253 bytes) Oct 23, 2022, 04:47 Uploaded by pnp2084MFI disk images for Sledge of Rahmul and Spook House | ||||
 No.20660
pnp2084 Tester
Oct 23, 2022, 05:27
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I've created a pull request with a proposed fix: https://github.com/mamedev/mame/pull/10464 |
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