Recent content by frontein1

The SD Card Formatter is probably worth trying. Like it says on the bluescsi.com site, use the overwrite format option to really go low level. https://www.sdcard.org/downloads/formatter/

Looks like I've identified my MARCHintosh project for this year!

I went with the GQ-4X4 from MCUMall. Also with the appropriate adapter and UV eraser. I'll report back on how that bundle works. Interestingly, I took a closer look at the board, and I noticed that the ROM sockets are actually 42-pin each even though the ICs being used are 40-pin. I pulled up...

Thank you @finkmac and @Boctor! Have the ICs and programmer in the mail. Looking forward to having some fun with the LCIII that I originally purchased from @jmacz.

Curious if anyone has tried replacing the stock LCIII ROM ICs with EPROMs? I'm thinking something along the lines of the 27C400, but I am trying to do a pin-by-pin comparison right now. Has anyone done any research on this before? And if so willing to share?

I was thinking that too. I have a 128KB that was old school kit upgraded to the Plus. That has the A revision in it. I just built a CatMac MacPlus and that has a C revision. And for good mid life crisis measure, I just found and ordered a D revision. For my existing A and C revisions, I did...

I've been able to see that there were at least four revisions of the MacPlus board (820-0174 A-D). What I am unable to find is any definitive information on what (if anything) changed between these revisions. Anyone able to shed any light on this?

Cannot wait for this! Consider me already queued up :) It might be really fun making the ROMs programmable, and building in a ROM disk and driver. I'd be happy to collab on this.

Maybe try to trace this in MacsBug to see if it consistently dies at the same address? This could help narrow it down to bad ram.

I made progress but then got distracted by other shiny objects :) I'll pull it out this week and see where I left it. I am determined to make it happen!

Wow this is pretty cool! Nice work!

Just playing the devil's advocate.... Have you tried writing to PRAM and making sure that remains persistent? You could use a tool like PRAM Doctor and write a unique value in to some byte. Power down and walk away for a couple hours, then when you power back on make sure it is there.

Glad to hear it is working well for you! Take a look at the ROM downloads on the CayMac site. The 040 ROMs are past beta now up to v1.0. Still working on finishing the 030 version. https://ko-fi.com/caymacvintage/shop

I'm trying to find the link for what I bought for my LC475/Q605. I went for the 128MB SIMM. But importantly I think I bought the one labeled "angled socket" so it would fit correctly.

Nice! I've been on the look out to buy an SE30 as well. I used to live in Salt Lake City right across from the University of Utah. I remember back in the mid/late 90's, I would often go into their surplus store. They had a LOT of SE30s on the shelves, but at the time they just weren't of any...