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Mac II with Turbo 040 - Unimplemented Trap

esselfortium

esselfortium

6502
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!
 
Last edited:
esselfortium said:
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!
Click to expand...
Wild idea, but possibly try installing this :

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 68kmla.org
 
Basically, in this sort of situation, it usually means that code is trying to call ROM routines that were added in newer ROMs.

Do you have the original II ROMs installed, or the IIx versions? Switching to IIx ROMs might help.

@Bolle

Any thoughts?
 
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?
 
zigzagjoe said:
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?
Click to expand...
I've tried it both ways, to no avail. Just did a new 7.5.3 install, making sure to set it to a universal version, and I get the same error.
 
@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.
 
macuserman said:
Hmmm have you considered trying with something besides the scsi2sd? I know it might sound dumb but I feel like it’s worth trying.
Click to expand...
Hopefully it’s not a rev A vs Rev B thing that would stink. I was hoping that would get you unstuck as it’s the exact image I used with that setup on my machine.
 
I have both an internal and external scsi2sd, and I'm getting the same results with both, so I don't think it's an issue with the scsi2sd. And super-minimal prebuilt installs of 7.1 and 7.5 do manage to boot successfully from either of them, just nothing else does.

There is a rust drive that came with this II, but I've never hooked it up. I'm not certain if I even have the necessary cables for it.
 
David Cook said:
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?
Click to expand...
The adapter to install the Turbo 040 eliminates both the original CPU and MMU.


esselfortium said:
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!
Click to expand...
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?

On some random googling around, I see notes that suggest that 7.5.x isn't supported without a potential ROM (of the card) upgrade. I think Disk Tools 7.5 (which that utils image is based on) is closer to 7.1 than it is 7.5, so that might explain why it works.
 
zigzagjoe said:
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?
Click to expand...
I got them both together, yes.

I'd take pictures but I've got things put away for now and might be taking it to a local Mac shop tomorrow, if they'll take on the project.
 
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