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DosFox came up with a way to program replacements, but finding the blank chips is difficult and the programmer is special. I don’t know about the 520, but the 575 CUDA can be replaced with ones from 630/5200/6200 type machines. Sometimes you can find battery-bombed boards from those pretty cheap...

I believe David is correct about looking at the EGRET/CUDA. In my experience from boards of this general era, no power = bad CUDA. Check to make sure the 5v standby voltage and 32KHz clock are getting there. If they are good, I’d wager dead CUDA.

Some info that I've accumulated that might be relevant to this thread and awesome guide. I socketed most of the chips on a good SE/30 and checked what happened to the boot process when each was removed. These are the results. UL11 / ADB- chime, hangs at 50% gray (square corners), no cursor UK11...

I'm working on a battery-bombed Laser 128 EX/2. Gate Array 1 (G/A1) is supposed to generate clocks off of the 14MHz crystal. The voltages and 14MHz crystal going into G/A1 are good, but none of the clocks are coming out. I fear that the chip is dead due to the battery leakage, but I'm hoping...

I recently did a refurbishment of a Fujitsu FM Towns II UG20. These are super cool little not-quite-DOS-compatible x86 all-in-one machines. It seems like the information is disbursed all over the place on the web, so I thought I'd do a post of the most useful things I found and the resources I...

Sorry to dig up an old thread, but I just wanted to post somewhere about some compatibility testing I did on EGRETs in a IIsi. I came across two different chips in my IIsi systems: 341S0850 and 343S0100-01 The chip from a IIvx worked: 341S0851 The chip from an LC475 did not work: 341S0788

I, as a biomedical scientist, *should probably not* be doing such a thing 🤣

I'm really sorry about this, but I'm new to the whole PCB world. I realized that I was missing a couple of files. I just updated the github with all of the required files and zip file that should have all of the required files already added to it, so you should just be able to send the PCB...

It’s a 3 layer board. One of the layers is an internal ground plane.

I designed a little PCB to use a 50 pin SCSI internally in a Mac Plus so that you can have devices like the BlueSCSI installed internally all stealthily. The files for the PCB are all available here: https://github.com/BigBadBiologist/Mac-Plus-Internal-SCSI The installation process (not...