68kMLA Classic Interface

I recently installed a Turbo 040 in my Mac II, and was immediately greeted with an "unimplemented trap" system error when trying to boot from my existing OS (7.5.3 I believe?). I've since tried a number of different images on it, with mixed success. It boots from a small premade 7.1 image via Disk Jockey, and it boots from 7.5 Utils via 68kmla IRC (thank you @zigzagjoe !), but I haven't been able to get it to boot with the originally-working system, a 7.5.3 install CD image, with a clean install of 7.5.3 made on the II using said image (while booted from 7.5 Utils), or from a prebuilt 7.5.5 image downloaded elsewhere. At this point I'm running out of ideas.

At first I thought it could be a MODE32-related issue, but the Turbo 040 manual makes no reference to a 32-bit requirement (and even mentions the ability to swap between 32 and 24-bit addressing modes), and it doesn't seem to want to boot from most systems regardless of what I've done with MODE32 and the 32-bit addressing setting, anyway.

Any clues what this might possibly be? Thanks for reading!

TokaMac 040 memory manager patch INIT

For those of you still using or trying to use the old TokaMac 040 accelerator in a IIci (maybe this works for the IIfx as well), this will patch the memory manager to properly handle bus errors. I created it back in the day after disassembling the memory manager in a 68040 ROM and seeing what...

68kmla.org

When installing the new system, did you do universal system for any macintosh (or any 68k, can't remember exact term) rather than the default system for mac ii only?

@esselfortium Are you using a spinning disk drive, or something else? I can send you a 2GB 7.1 that I used with my Rev B Mac II if you want to try that. Doesn't get you to 7.5.X though.

Thank you very much! I'm using SCSI2SD, so I can dd an image to it.

.hda is perfect, I can use dd to write it directly to the card. Not as convenient as Zulu, but it gets the job done.

Thank you. Alas, it still errors. I might be out of luck, then.

Hmmm have you considered trying with something besides the scsi2sd? I know it might sound dumb but I feel like it’s worth trying.

I have the original II ROM.

There are five versions of the ROM. Which one do you have?
View attachment 61281
Also do you have the 68851 PMMU installed or the original black Apple AMU?

I recently installed a Turbo 040 in my Mac II, and was immediately greeted with an "unimplemented trap" system error when trying to boot from my existing OS (7.5.3 I believe?). I've since tried a number of different images on it, with mixed success. It boots from a small premade 7.1 image via Disk Jockey, and it boots from 7.5 Utils via 68kmla IRC (thank you @zigzagjoe !), but I haven't been able to get it to boot with the originally-working system, a 7.5.3 install CD image, with a clean install of 7.5.3 made on the II using said image (while booted from 7.5 Utils), or from a prebuilt 7.5.5 image downloaded elsewhere. At this point I'm running out of ideas.

At first I thought it could be a MODE32-related issue, but the Turbo 040 manual makes no reference to a 32-bit requirement (and even mentions the ability to swap between 32 and 24-bit addressing modes), and it doesn't seem to want to boot from most systems regardless of what I've done with MODE32 and the 32-bit addressing setting, anyway.

I've also tried removing the NuBus ethernet card that was in there, but that also didn't help anything.

Any clues what this might possibly be? Thanks for reading!

The turbo 040, did you get it with the Mac II adapter at the same time? If not, I suppose it's possible that it's an older version of the accelerator that doesn't support Mac II? Mind uploading some pics?