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I also think you have a good enough board to migrate the working parts. Try and clean it up as best you can, the RTC looks like it might be saveable.

This totally isn't to make @Mac84 jealous and hungry, I promise 😂 This wasn't made by me, but by my wife, @boopbox123 So, it's a gluten free sponge, using xanthan gum, cut into squares - each square has the centre cut out, filled with seedless raspberry jam and then the centre put back in...

I do have a spare LC475 you can use...

They work quite well for lifting PLCC chips after you hit them with hot air - stick them under when the solder is solid, then the weight of the tool will ping the chip clear once the hot air melts the solder enough, and the chip stands less chance of getting stuck to other pads.

I'm jelly of myself with this one - it's like the holy grail of rare-ass accelerators...and I GOT ONE! :D I am never, ever parting with this machine...

The mythical beast that is the PPC601 Upgrade card, and the LC475, smashed together! This started life as a Japanese LC475 (no different to any other 475, but it's from Japan and therefore, cooler than yours). It actually came already with a 32MB SIMM in it and 2 x 512kb VRAM SIMM's, but no...

*sneaks this onto his wife's eBay basket* :p

Haha - i'll finish the order of the QS32X348's and send it along with those - I just need to find the right diodes.

You could always make a USB Key with FreeDOS on it: http://wiki.freedos.org/wiki/index.php/USB

Can someone check me on this - i've found some parts that might work, and match at least some specs. I've included the original ZC834 datasheet, but also linking on digikey to the other parts: https://www.digikey.co.uk/en/products/detail/macom-technology-solutions/MAVR-000401-0287AT/12627541...

...Passives on, but i've lost two of the diodes and a resistor in the kitchen somewhere - no biggie, right? Well, the diodes are marked J5 which equates to a ZC834 single diode. Which are obsolete. And i can't find a suitable replacement as they're variable capacitance... 🤦‍♂️ The other issue...

IT WORKED! Full heat on the cast iron helped the socket just pull right out - however, in the process, the PCB lifted about 1cm and dropped...and then flung off the bus switches and a few passives - all are intact, no bent legs, just means i have to solder some TSSOP-48 parts! No trace damage...

I've spent 4 hours so far trying to remove it with little success so far. I've currently got it on a cast iron hotplate in the kitchen. I fluxed the crap out of the pins and methodically went over each one with the iron set to 380*c and some 2.0mm GootWick, and have cleared each individual hole...

Paging @techknight :p

Some of you may not be aware, but we do indeed have a Discord server, ideal for chatting with fellow tinkerers - come and join in! :) https://discord.gg/CM3JqTSTNF

http://www.merlintec.com/download/unitron1.pdf http://www.merlintec.com/download/unitron2.pdf I uncovered these a while ago, it may help to reverse engineer the PAL's used on the 128k, 512k and potentially, the Plus. All of this is courtesy of a genius by the name of Jecel Mattos de Assumpcao...

The following is courtesy of Wouters page on the Macintosh PAL's, here: http://www.retro.co.za/ccc/mac/ReverseEngineering/PALs.html /TSEN0 /CS 11 10 GND /CASL O 12 9 I /LDS /CASR O 13 8 I /UDS /RAS R 14 7 I /AS TC R 15 6 I /ROM C1M R 16 5 I /RAM...

Want to sacrifice one to me to reverse engineer? ;)

Get yourself a Meanwell RT-65B Power Supply, some wire and a 14-pin Molex Mini-Fit Jr plug & crimp tool - you can make a really simple bench power supply for these :)

@Ron's Computer Videos That looks simple enough to replicate, the PAL/GAL on it could potentially be reverse engineered by @Bolle