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Identifying a Plus 68030 upgrade?


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I'm restoring a Plus that has a 25mHz 68030 / 25mHz 6888 math co-processor upgrade, but there are no identifying marks on it, on either side (well, it's soldered on so I can't see 100% of the underside, but from what I can see there's no labels/writing) - is there a way to tell who made it? There were quite a few upgrade options, so it's not easy to narrow it down that way.

 

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Oh wow thanks everyone! I got this 1986 beige for a song because the display had lost horizontal sweep (10 minute fix) I had no idea what was inside, so this was a pleasant surprise. Now I have that lucky / guilty feeling... haha

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On 10/7/2020 at 11:44 AM, desertrout said:

I'm restoring a Plus that has a 25mHz 68030 / 25mHz 6888 math co-processor upgrade, but there are no identifying marks on it, on either side (well, it's soldered on so I can't see 100% of the underside, but from what I can see there's no labels/writing) - is there a way to tell who made it? There were quite a few upgrade options, so it's not easy to narrow it down that way.

 

 

Nice score! I have one I found in a $5 Plus I bought back in the late '90's.

I made an over-long thread about mine.

 

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9 hours ago, MOS8_030 said:

Nice score! I have one I found in a $5 Plus I bought back in the late '90's.

I made an over-long thread about mine.

 

Sweet. Good info. This Plus doesn't have the extra PS... Do I need it? It did have the fan installed, but I removed it... it was exceptionally noisy, and I live in a cold environment... I can add another later if I need to, I just terminated the wires.

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Ha - so I bought three Pluses from the same lot sale, dirt cheap - two 1986's, one 1988. This mobo is from 1986 #1. I finally opened up 1986 #2 tonight and - surprise - same upgrade. It has some more serious issues, potentially, but I haven't started troubleshooting yet. Crazy.

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I believe that side connector is for SCSI, but I have no documentation to that affect and I have never tried connecting anything to it.

A lot (most) of these boards were powered by tapping into the Mac's analog board.

Some connected directly to board with clips and some, like mine, tapped into the pig tail.

Personally I think this may put unnecessary stress on the Mac's power circuit so installed the extra power supply and a new fan.

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  • 2 weeks later...
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On 10/9/2020 at 4:39 PM, MOS8_030 said:

I believe that side connector is for SCSI, but I have no documentation to that affect and I have never tried connecting anything to it.

A lot (most) of these boards were powered by tapping into the Mac's analog board.

Some connected directly to board with clips and some, like mine, tapped into the pig tail.

Personally I think this may put unnecessary stress on the Mac's power circuit so installed the extra power supply and a new fan.

What did you use for the extra PSU?

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2 hours ago, techknight said:

Interesting. Mine didnt have an external power supply. the card was hard-wired into the Plus existing harness. 

That's how mine are currently as well, for both the fan and upgrade, but for $25 and some wire, an additional PSU seems to make good sense. I haven't booted with the drivers yet to see what the actual comparative draw is, but I have read elsewhere that you normally have to boost the voltage pot, and that some boards can be cranked higher than others making them better candidates for upgrades, so an additional PSU is probably prudent for longevity.

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Wondering if I can get pointed in the right direction with Compact Virtual 3.0... It keeps crashing on boot, complaining the math coprocessor is not installed. I'm running RailGun 5.42 (which should be compatible with CV3 according to the readme) on System 6.0.8. There's definitely a FPU there, RailGun sees it. No matter the settings I change, it bombs. What gives?

 

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Posted (edited)

Oh yeah for some reason the accelerator drivers and CV are really hard to set up together without breaking things.  I spent a lot of time trying to figure this setup out a couple years ago.  I since sold mine, but from my notes, I got it to work (Compact Virtual + RailGun drivers) only by installing CV from the Installer and telling it I had a Mercury accelerator (even though I didn’t).  That was the only installer config option that got things to work — but once I did that, it worked perfectly under both 6.0.8 and 7.0.1.

 

Let us know if you have any luck, or find a better way.

Edited by Crutch
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Thank you kindly! I tried what you suggested, but sadly the same result... except that I could use the mouse... I also tried a couple other card choices from the installer, and tried both restarts and cold boots, but no luck. Weird. Anyway, I'll spend some more time with this on the weekend and take a more methodical approach.

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