Testing Needed: Apple CD/DVD Driver 1.4.8 Universal For 7.1 - 9.2.2 (SCSI Drives)

[rdmark]

Yep, I can put it up on Macintosh Garden. I'll do it right now.

Edit: Ok, I have it uploaded to Macintosh Garden.

Apple CD/DVD Driver 1.48 - Edited For Universal SCSI Compatibility - *Beta Test* - Macintosh Garden

This is the Apple CD/DVD Driver 1.4.8 extension, which was the last one released by Apple for the classic Mac OS. Editing less than 10 bytes changed this from an extension that only works with Apple SCSI CD-ROM or DVD-ROM drives to one that works with both Apple & 3rd party SCSI CD-ROM or...

macintoshgarden.org

Please respond in this thread with any information regarding success or failure rather than on the Macintosh Garden page, since I will probably forget to check the Macintosh Garden page.

Do you think it would make sense to merge this Mac Garden page with the below? It has a collection of three other variants of hacked Apple optical drivers.

https://macintoshgarden.org/apps/apple-cd-rom-extension-patched

BTW, you may have seen this already but there's this classic article lifted from a magazine in 1998 that describes a very similar hack (which was adapted for the patched extensions hosted above.) I'd be curious how this hack compares with yours!

 

[Paralel]

Do you think it would make sense to merge this Mac Garden page with the below? It has a collection of three other variants of hacked Apple optical drivers.

https://macintoshgarden.org/apps/apple-cd-rom-extension-patched

BTW, you may have seen this already but there's this classic article lifted from a magazine in 1998 that describes a very similar hack (which was adapted for the patched extensions hosted above.) I'd be curious how this hack compares with yours!

I think its makes sense to merge it with that page once the bugs are worked out. Since this one isn't working 100% yet I'd hate for someone to download it thinking it will work for them at this point.

The edit to the 1.4.8 extension is substantially similar. If one compares the modified extension in the first post, with the original extension attached to one of my posts further down, you can see that the differences are very small. But, something isn't quite right since it should have worked correctly for Nixontheknight, instead of triggering an exception, since the original extension worked without issue.

I'm still trying to figure out what isn't quite right. I went over the editing I did, and it should have worked. I'm not quite sure what is causing the issue.

 

[Nixontheknight]

I think its makes sense to merge it with that page once the bugs are worked out. Since this one isn't working 100% yet I'd hate for someone to download it thinking it will work for them at this point.

The edit to the 1.4.8 extension is substantially similar. If one compares the modified extension in the first post, with the original extension attached to one of my posts further down, you can see that the differences are very small. But, something isn't quite right since it should have worked correctly for Nixontheknight, instead of triggering an exception, since the original extension worked without issue.

I'm still trying to figure out what isn't quite right. I went over the editing I did, and it should have worked. I'm not quite sure what is causing the issue.

It might just be pickyness with my LC III, I did overclock it from 25MHz to 33MHz, though that might not be the case

 

[Windoze]

I had the same problem (Illegal Instruction) when testing with OS 7.6.1 and OS 8.6.
Then I compared the patched driver with the original and noticed that one value was set to 0x4E 0x17 instead of 0x4E 0x71.
The former is an illegal instruction the latter is a nop.

So I changed the 0x17 to 0x71 and now it works perfectly for me. Attached is my modified version.
Only thing I don't understand is how it could work for anyone with the wrong byte in there...