Mac II with Turbo 040 - Unimplemented Trap

[Phipli]

D

might be taking it to a local Mac shop tomorrow, if they'll take on the project.

Do they specialise in 35 year old machines?

 

[esselfortium]

They have a large collection of classic Macs and they do work on them for people, yeah. This might be beyond what they're willing to tackle but we'll see.

 

[Phipli]

Try this first...

SCSI2SD Quickstart

SCSI2SD Quickstart (Draft) The following guide is designed to get up and running quickly with a SCSI2SD when you don’t have any installed OS on your antique Macintosh. The following are requi…

stuffandnonsense.elephantandchicken.co.uk

This is a setup that is known to work in a IIx... Because I made it using a IIx.

The IIx is almost a Mac II

 

[esselfortium]

I've had luck with some minimal partitions like that one, just not with any full OS installs, including the exact install from the Mac II this was pulled out of before it was sold to me.

 

[Phipli]

I've had luck with some minimal partitions like that one, just not with any full OS installs, including the exact install from the Mac II this was pulled out of before it was sold to me.

That isn't a minimal install. It includes multiple partitions and the full installer for 7.5.3 so you can install everything you need.

I suggest trying it, and doing exactly what it says, step for step.

 

[macuserman]

I've had luck with some minimal partitions like that one, just not with any full OS installs, including the exact install from the Mac II this was pulled out of before it was sold to me.

Might be worth snagging a Zulu just to try, they aren't super expensive, if you do I'd recommend the earlier version, I've had better success with the rev 1 blue boards in 68k machines vs the newer ones which seem to give me fits and throw errors even just with swapping over the sd cards which in theory should be identical. https://store.rabbitholecomputing.com/ZuluSCSI-V1-1-p/zuluscsi-v1.1-rev-2022c.htm

 

[esselfortium]

That isn't a minimal install. It includes multiple partitions and the full installer for 7.5.3 so you can install everything you need.

I suggest trying it, and doing exactly what it says, step for step.

I did a 7.5.3 install on the II a few times yesterday using the full installer, no luck. When I reboot with the new OS it just dies. I can only assume there's something in the System file that it's choking on, that it should not be choking on. I can try this again following your steps, though. Thanks.

Might be worth snagging a Zulu just to try, they aren't super expensive, if you do I'd recommend the earlier version, I've had better success with the rev 1 blue boards in 68k machines vs the newer ones which seem to give me fits and throw errors even just with swapping over the sd cards which in theory should be identical.

Thanks for the info on those! Would definitely be more convenient than the SCSI2SD.

 

[Phipli]

I can only assume there's something in the System file that it's choking on,

Not with a clean install. Did you format the disk first from the II?

The issue feels like either a SCSI2SD setting, or a hardware issue. 7.5.3 works on the Mac II and older machines.

I do remember that some versions of the SCSI2SD played up with certain computers. I forget which, but I know the first of the green ones wouldn't work in an SE. I was lucky that I got a red one at the time. That said, I have a green one of some description that works fine in my IIx and the SCSI on the IIx should be the same as on a II.

 

[Phipli]

Another thing, have you got a multimeter? Measure the voltage between the black and red pins where the power supply connects to the board (any black, any red) when the computer is running. What does it read?

 

[Phipli]

Not with a clean install. Did you format the disk first from the II?

The issue feels like either a SCSI2SD setting, or a hardware issue. 7.5.3 works on the Mac II and older machines.

I do remember that some versions of the SCSI2SD played up with certain computers. I forget which, but I know the first of the green ones wouldn't work in an SE. I was lucky that I got a red one at the time. That said, I have a green one of some description that works fine in my IIx and the SCSI on the IIx should be the same as on a II.

Don't actually worry about this too much. I'd overlooked that you had it working before the upgrade.

Do check the voltage though. The addition of the accelerator can cause voltage issues.

 

[esselfortium]

Ok I just sent you a link to it on my dropbox. Sorry it's so large I didn't want to risk messing it up by compressing it.

Just got this image to boot after zapping the PRAM. I feel extremely silly now for not trying that sooner.

 

[macuserman]

Just got this image to boot after zapping the PRAM. I feel extremely silly now for not trying that sooner.

That's great news! I'm glad you were able to get that working! You're making progress!

 

[esselfortium]

Thanks again for all the help!

Now, the saga continues. Getting unimplemented trap again when starting a game in Doom 2. Tried again with MacsBug installed and got this output:

 

[esselfortium]

Does the above suggest that something could be wrong with the ROM? I'm not sure how to diagnose this.

 

[zigzagjoe]

Does the above suggest that something could be wrong with the ROM? I'm not sure how to diagnose this.

Type the command 'ip' at the prompt and take a pic of the output - it will include the failing trap

 

[esselfortium]

Thanks for the suggestion!

(Phone screenshot instead of regular photo from phone because this way manages to do a better job of displaying the CRT, somehow...)

 

[esselfortium]

Hmm, running Ultimate Doom (or loading Doom II via the Ultimate Doom application) actually works fine, more or less. (Manages to usually get into the game, at least.) No clue why it's not getting along with the version of Doom II that's on Macintosh Garden.

 

[esselfortium]

Still getting some crashes, so I'm still curious what's going on with it.

 

[cheesestraws]

Is this with 7.1?

 

[David Cook]

Attached is Alessandro Levi Montalcini's Trap Check 1.1.1 report tool. Prior to crashing, run this and post the output file. I'm curious to see if you actually have unimplemented traps or have a memory issue.