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For people who find this post, I'm not currently taking orders since I'm busy with other things. I might be able to figure out another way to make them available though and will post here if and when that happens.

I had this same issue with a IIsi. Recapped and death chimes afterwards with a known-good PSU. I ran TechStep diagnostics and sure enough: MacIIsi RAM size: 0 MB? LgcBdRAM: BAD SIMMS: | | | | The chips on this MLB are Samsung KM44C258J-8 256K x 4-bit in a SOJ-26/20 package. I had a spare...

@pgreenland yes, but shipping internationally is really expensive for what they are. I'd take up @mg.man's offer if I were you :)

I just tried the driver @BadGoldEagle posted here. On my SE with system 6.0.8 it hangs on a gray screen after Welcome to Macintosh. On system 7.1 it hangs at a black screen after Welcome to Macintosh. I have two of these cards. I tried with both and got the same results.

@Treebeard can you post the driver you're using? I'm trying to get a similar card from a MicroMac SE. I have a couple versions of the Dual Screen 2.3 Control Panel. One shows a single option to drive the Ehman Full Page display. The other has a single option to drive a generic 15" Full Page...

I have a similar board and the Mobius driver did not work. @SuperSVGA did you happen to have any ideas about recovering that archive?

Here's a reworked cartridge. The PLCC socket was a PITA to remove but did eventually let go. The main fallout was that a couple areas lost a bit of solder mask. This is what I did to get the socket off: 1) Sopped up as much solder with wick as possible. 2) Placed a hobby knife on the side with...

I was able to mod the board as @SuperSVGA instructed and it did indeed work! Here's how I went about it. 1. Cut the traces as advised above and tested for continuity 2. Scraped the mask off of the affected vias 3. Placed 40AWG enameled wire into place and secured it with kapton tape 4...

@SuperSVGA is it something we can bodge? @jajan547 this is the socket I used. It required a couple modifications. I flush cut the nubs that would normally pass through the PCB and I cut out the plastic well to make room to solder. I tried soldering with the well in place, but ended up melting...

To be clear the 512kilobit chips themselves work fine when I drop them into an original TechStep cartridge. The original tech step ROM does not work in the new 512kilobit board. So something is wrong with the board design or my build. Yes I did install the resistor. In the photo below the red...

I wasn't able to get the 512KB boards working. @SuperSVGA @jajan547 will you be building those versions too? It'd be great to know your results. I ended up building two more of the 1megabit boards and burning the 512kilobit images to AT27C010-70JU-T's. Both Vol 1 and Vol 2 worked just fine...

I finished making all the carts and labels, yay! I ended up using this laser printer sticker paper for the labels. It came out great and did not smudge at all. Unfortunately the 512 kilobit carts are not working at the moment. I could have sworn I tested them yesterday, but maybe I got...

A? :)

I got the new boards today and put a few together. Everything is working fine, including Volume 4. Yay! Thanks @SuperSVGA and @jajan547 !!

@olePigeon I have a reader/programmer and am near you as you know. Will DM you.

If you open the Vol 2 file you posted in a hex editor you’ll see everything after 65000ish bytes are all zeros. I just concatenated the file to be exactly 65,536 bytes, lopping off the other 65,536 bytes full of zeros. The volume 4 issue is different. It should be a full 131,072 bytes but there...

Yep, I wrote that truncated version to a AM27C512 and tested it in the TechStep. It booted and seems to be okay though I didn't go through all of the tests. The part I truncated was literally just zeros. I have not written a copy of Vol. 4 yet though. I think we should see @SuperSVGA 's dump...

I opened Volume 2 in a hex editor and indeed the second half of the file is empty. Here's a trimmed version.

@jajan547 one other thing. Earlier you said The Volume 2 ROM you posted is 131072 bytes, meaning that's from a 1MB ROM, right? Just want to be totally clear to avoid wasting any EPROMs. Your Volume 1 and SCSI ROM files are both 65,536 bytes though.

This is the same one I was using. It's showing 131,068 bytes (4 bytes short). Have you run through all of the tests with it? FWIW, the Vol 3 ROM you posted is exactly 131,072 bytes and wrote without issue.