68kMLA Classic Interface

@SuperSVGA Have you already posted your ROM dumps somewhere?

It looks like the dump might be missing four bytes somewhere in the middle, since earlier data seems to be offset by four bytes as well. It's possible it may still work, but I haven't tested that dump since it looked different than my dump.

No, I haven't. I can post them but they're on another computer so I'll have to find a time to either switch to that computer or dump them again.

Also, here's rev 2 of the enclosure. The pins were moved in .5mm on either side, the holes increased in diameter and the front pin reduced in z 1mm. They now come together well, stay put and if you're gentle and lucky you can separate them without breaking the pins.

Ok here's what I get with the AT27c010-70JU-T on my mini pro I have also added the ROM file I used.

ROM I used here is the one below, I am using Windows 11 Home FYI.

1MB is for 3 and 4 and 512k is for the [SCSI HD] tests, cpu tests 1 & 2

@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.

Vol 2 works on a AM26C512 as well and also I only tested vol 4 on a M27C512 I’m waiting to test it on a new board because all I have is the new board.

Vol 2 works on a AM26C512 as well and also I only tested vol 4 on a M27C512 I’m waiting to test it on a new board because all I have is the new board.

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

This works yes?

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 first to see if it's complete.

I agree with what you are saying about the Vol.4 ROM from @SuperSVGA. I wanted to ask is basically what you did just remove redundancy in the multiple 0's and such? Also my new boards should be here next week or maybe this weekend, I ordered 5 of each so we can test accordingly. I also wanted to say that the revision 2 ROM case fits much better but both still hold the cartridges together even if the posts are broken. I hope we can really make some new ROMs or maybe an all in one, if possible?

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 are 4 bytes missing in the middle somewhere based on what @SuperSVGA was saying in a previous post.