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Check that all of the ground clips on the motherboard are present and clean. They are the little rounded tabs that clip onto the motherboard.

Greatest retro computing quote ever: "like some sort of retro-computing Turducken."

It looks like the reduced speed was related to the FPU not being recognized. I went back over my soldering and the FPU is now being recognized and the accelerator is working and benchmarking at full speed. I can only assume the driver is making use of the FPU to speed up regular operations...

That looks like the screen you get before the computer resets. It's weird that it booted the first time and stayed on but then wouldn't boot the second time. I wonder if the CPU is getting the reset signal to kick things off. Not sure how that looks on the IIgs but if you have a scope I'd start...

That is interesting. I'm looking into options to see if I can buy an updated TW1340 in hopes that I can clone the CPLD and EEPROM. In other news, I received the full 68030 chips (thanks for the source @zigzagjoe. I am a pretty proficient solderer but wow, that QFP package was a pain. I need...

Thanks @zigzagjoe. I ordered a few of those 030's and should have them in a couple of days. That being said, the purpose of this exercise was to see if I could coerce my TW2340 accelerator to show more than 4MB of RAM. I have now found somebody with the same accelerator (well, the SE version)...

I'm not sure if there have been further updates but an article I read before on the sun-only retro bright method showed a significant and detrimental impact regarding the brittleness of the plastics. I would prefer to do a retro bright bath for 4 hours than 3+ days of high UV exposure on these...

Interesting - Is J5 just a pass through for the floppy disk? I wonder if that is partially to provide another support point for the card? It looks like it has some cache onboard - I wonder how much faster this board is versus the more simplified cache-less boards. Nice card!

I am still thinking about swapping the processor for a full 030 to (likely) be able to use Connectix Virtual. As far as I can tell though, the regular 68030 in QFP was not made in speeds greater than 33mhz. Is this correct? Do I take my changes running a 33mhz part clocked to 40mhz?

I didn't see any place in Compact Virtual to get information on installed RAM. When I open the control panel, it immediately complains about the lack of an MMU or 040 - after I click OK, the control pan does show a slider that goes up to 16MB, but my assumption is that it would show that...

I tried installing the Gemstart drivers (Universal installer, trying multiple different accelerator options). In all cases, the control panel didn't recognize any of the onboard RAM on the Transwarp. (For certainty though, the accelerator is undoubtedly using the accelerator RAM and not the...

Thanks. I had read that thread when doing my research. The key difference though is the recognized physical RAM. In that thread you had noted: Yup, Mobius driver (without Virtual) mentions 16MB of onboard RAM. My card only shows 4MB as being physically installed on the accelerator card even...

The accelerator is already using the onboard RAM (not the motherboard RAM) so it's already running at top speed. This is evident as I can run with only 1MB on the motherboard but it still reports 4MB (ie the accelerator RAM) plus I can tell just from the speed it's running at it is using the RAM...

Thanks for this - For clarity, when you say you could use Compact Virtual after swapping to a full 030, does that mean that: a) You could then use Virtual to create a swap file on your hard disk to use (slow) virtual memory; or b) Your accelerator began to report > 4MB of physically installed...

I did. When opening the CDEV it it says no MMU or 68040 and it doesn’t load at boot (has an X through it)

I am curious to know what would happen if I did replace the EC with a full 030. My gut is that I would then be able to use Connectix virtual to use disk based virtual memory but that the accelerator still wouldn’t see the any more physical memory, so I wouldn’t be much further ahead than I am...

As an update, I tried the TW2340 in a different Mac Classic, and tried different 4x4MB SIMMs. Same issue, it only shows 4MB of RAM installed. It would be very interesting to read the manual for this card (TW1340 or TW2340) if anybody has a copy

Thanks. The current issue im having is it never reports more than 4mb even though there is 16mb installed on the accelerator. So potentially a different issue. It seems like your accelerator actually showed 16mb as being physically installed just not usable (ie in the control panel info screen)?

I recently acquired an Applied Engineering TW2340 accelerator for the Macintosh Classic (40mhz 68EC030 with FPU and SIMM sockets). Sales materials on the accelerator available here (https://www.savagetaylor.com/2022/06/07/68k-accelerators-fpus-and-other-cpus/) indicate it does NOT support...

Ha! You can ignore this. I subsequently found your sale post and see you sold the accelerator.