I have a Lisa 1 and have advertised on 68kmla before about my enthusiasm for helping people back up old disks. I will gladly do this for free for anyone with a disk in a condition that's unlikely to damage my drives.
Unless there's something unique about the geometry of Mac prototype Twiggy drives, which I suspect is unlikely (but have no idea either way), backup via BLU is likely to work for a disk in fair condition.
That said, I live in the UK and any overseas shipping would have to be considered very carefully! There are probably other recovery options to consider first. Still, my Lisa 1 is at your service.
Thus far Twiggy drive belts appear to be fairly robust. (At least something about the drive is robust!) Mine are the originals as well, and I've heard at least one other Lisa 1 owner reporting the same.
I have heard rumours that you can stick a Macintosh Twiggy disk into a Lisa 1 and dump it using Basic Lisa Utility (BLU), but that's only a rumor/speculation. The Twiggy drives were notoriously unreliable though, so perhaps your drive has some sort of f ault - especially if the original belt is still on.
Any chance of dumping the ROM? That's something that also needs to be preserved.
I do not see this posted elsewhere, so thought I would share. Too rich for my blood, and current bid of $6k doesn't meet reserve. This is a very respectable collection for sure.
I've got a Macintosh IIvx that I'm repairing. I replaced the battery and all the caps, can't see any PCB damage. It turns on as soon as it gets mains power, and if you try to shut it down, it boots right back up again. Machine works perfectly fine in every other way except for the automatic turning on. Pin 26 of the EGRET chip that goes to the PSU ON wire on the power supply. That seems to always be high and looks like it's the reason the power supply is always on.
EGRET chip has (Motorola logo) 341S0851 (c) 1990 APPLE 0C25TLLNG9230 on it.
Things I have done (with testing between steps):
- replaced all caps and battery and cleaned up motherboard with 99.9% ispropyl
- cleaned in distilled soapy water (and dried with compressed and and heat gun)
- removed EGRET chip, cleaned underneath and reinstalled (with leg 26 lifted/disconnected for testing)
Things I have tested:
- computer turns itself on with and without keyboard/mouse connected to ADB ports
- computer turns itself on with and without new battery
- power supply doesn't turn itself on when not connected to motherboard
- shorting pin 26 of EGRET chip to ground turns computer off, ungrounding turns it back on
After lifting leg 26 of EGRET chip, it no longer turns itself on, but the lifted leg is still high. Shorting the leg to the pad it's supposed to be soldered to turns the computer on, removing short turns it off again.
I can't find schematics for the IIvx or any spec sheet or pinout for the EGRET chip.
Any suggestions? Thanks.