Recent content by Kai Robinson

Just wanted to weigh in here, with regards to anyone thinking of posting here as an alternative, please see our infrastructure overview to get an idea of how TD is setup as a site and what we have in place on the back end. https://tinkerdifferent.com/threads/infrastructure-overview-2021.670/

Looks to be an MFM drive. I'd bet that you're right @JDW in that the drive needs to be low level formatted first.

I'd love to see the end results!

The pdf is in the resource section.

DosFox on the TD discord reverse engineered the SND chip, check there, the schematics and gerbers may be open source.

Would help to know where you're based - due to tarriffs putting the kibosh on international shipping right now, makes sense to recommend services as local as possible.

IIRC @This Does Not Compute tried this with a 540c and....no luck.

If CPU wasn't working you wouldn't be getting a chime, likewise with the GLU - honestly i think it's either RAM MUX/resistor packs, something to do with the PAL logic.

I'd imagine the ROM is fine, given the death chime. When my Iifx went wonky, turned out to be poor oscillator connection and clock signal.

Hi Steve - hope you don't mind me undeleting this - it's a valid question that others might find useful to leave up and around. Also the IIx and IIcx GLUE is the same, iirc, as the SE/30 is a IIcx in a compact chassis with 1-bit video.

As long as you can see the waveform shape and aren't measuring high clock rates, for basic stuff, that should be OK.

Go for it!

Hi - I merely posted the link, i've not used the tools - check the link itself in the initial post, which will send you to GitHub and explain more than this thread.

Checkerboard like that indicates that the CPU is running, it's not being held in RESET and the ROM is working - you're experiencing a RAM issue. Check all the RAM SIMM's are installed correctly, and the jumper is left OPEN unless you're using 256k SIMM's

At this point I'd order replacement chips and transistors, they're pennies each.