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Repairing and modchip a PS One?
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<blockquote data-quote="KleinesSinchen" data-source="post: 10156275" data-attributes="member: 445180"><p>Always hard to troubleshoot something when there are multiple possible causes of error… resulting in the same outcome/error.</p><p></p><p>Detecting games as audio:</p><p>The PS1 (unmodded) does the following on power on (assuming lid is closed and CD inserted)</p><p></p><p>Read TOC</p><p>Search for SCEx wobble</p><p>If correct wobble code found → boot game <span style="font-size: 10px">(after checking wobble one more time)</span></p><p>Else if CDDA present → boot audio player</p><p>Else → "Please insert PlayStation format disc"<span style="font-size: 10px"> (you dirty pirate!)</span></p><p></p><p>Backup CDs of games with audio tracks are considered normal audio CDs and will boot into the player</p><p>Backup CDs of games without audio tracks trigger the red screen.</p><p>========</p><p></p><p>Of course a bad drive (and/or bad CDs) can mess with these things. In case reading the TOC needs retries, the timings for getting SCEx might not be correct and the original CD will not be authenticated. Got one disc from the flea market where the PS1 reads overly long in the TOC area before accepting. This disc had some white fungus all over which I was able to remove with car polish, but it nevertheless isn't of 100% quality. Since the wobble code is repeated lots of times, eventually a good one is found.</p><p></p><p>The authentication can be heard when listening carefully. Example with a good disc:</p><p><span style="font-size: 10px">(I have to repeat the recording with a properly lubricated drive reducing background noise from the spindle.)</span></p><p><img src="https://gbatemp.net/attachments/waveform-png.334256/" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>===========</p><p>===========</p><p></p><p>So we have the following possible sources of error for backup loading:</p><ul> <li data-xf-list-type="ul">Bad drive</li> <li data-xf-list-type="ul">Bad modchip (wrong flash, bad chip)</li> <li data-xf-list-type="ul">Bad installation</li> </ul><p>The most puzzling part here is Spyro being detected as CDDA. There are no audio tracks.</p><p></p><p></p><p></p><p>The only idea I have is starting from Memory Card (FreePSXBoot) and trying to load a backup from there. If this works, the modchip is probably the problem. If you can't load backups with softmod, I guess the drive is toast.</p></blockquote><p></p>
[QUOTE="KleinesSinchen, post: 10156275, member: 445180"] Always hard to troubleshoot something when there are multiple possible causes of error… resulting in the same outcome/error. Detecting games as audio: The PS1 (unmodded) does the following on power on (assuming lid is closed and CD inserted) Read TOC Search for SCEx wobble If correct wobble code found → boot game [SIZE=2](after checking wobble one more time)[/SIZE] Else if CDDA present → boot audio player Else → "Please insert PlayStation format disc"[SIZE=2] (you dirty pirate!)[/SIZE] Backup CDs of games with audio tracks are considered normal audio CDs and will boot into the player Backup CDs of games without audio tracks trigger the red screen. ======== Of course a bad drive (and/or bad CDs) can mess with these things. In case reading the TOC needs retries, the timings for getting SCEx might not be correct and the original CD will not be authenticated. Got one disc from the flea market where the PS1 reads overly long in the TOC area before accepting. This disc had some white fungus all over which I was able to remove with car polish, but it nevertheless isn't of 100% quality. Since the wobble code is repeated lots of times, eventually a good one is found. The authentication can be heard when listening carefully. Example with a good disc: [SIZE=2](I have to repeat the recording with a properly lubricated drive reducing background noise from the spindle.)[/SIZE] [IMG]https://gbatemp.net/attachments/waveform-png.334256/[/IMG] =========== =========== So we have the following possible sources of error for backup loading: [LIST] [*]Bad drive [*]Bad modchip (wrong flash, bad chip) [*]Bad installation [/LIST] The most puzzling part here is Spyro being detected as CDDA. There are no audio tracks. The only idea I have is starting from Memory Card (FreePSXBoot) and trying to load a backup from there. If this works, the modchip is probably the problem. If you can't load backups with softmod, I guess the drive is toast. [/QUOTE]
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