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Looking for the Q700 IIcx Power Supply schematics ...

I successfully repaired my Macintosh IIsi ... https://68kmla.org/bb/index.php?threads/iisi-fault.47209/ ... but I noticed that the computer has a problem with the PRAM, it always loses the settings it has made after switching it off and rarely but not. What could be the error and where should I...

There are relatively many Nubus monochrome graphics cards with a DB9 video output. Are these always TTL outputs or are they mostly ECL outputs? TTL outputs can simply be passively connected to a VGA connection. Is there a pinout somewhere for the different DB9 video outputs?

I have a IIsi that works before fine and now it take some time until the sound of dead sounds up. The motherboard looks good except for a little oxidation on the four 74ALS245 chips. I desoldered these all and cleaned everything up and checked connections and soldered on four new chips but the...

I would like to build a null modem cable. Does anyone have the schematics for me between Quadra700 RS422 and PC RS232 9pin serial port ...?

I have a Q700 with the fault there is no Video Signal Output. There is no sad mac sound so I think the mainboard is fine except the Video Out. The NVRAM battery wasn't leaking but the video chip has an oxidized spot on three legs and one spot was soldered. Need some tips what should I do with...