Unknown 1986 Apple Macintosh Plus Portable / Luggable Industrial Vintage Computer

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Unknown 1986 Apple Macintosh Plus Portable / Luggable Industrial Vintage Computer
I bought this unusual computer recently and was wondering if anyone knew anything about it. From the sellers description below:

Not much is known about this machine other than it’s based on a 1Mb Macintosh Plus machine, it’s completely custom made in around 1986 and it does not work.

It is built to a really high finish with injection moulded plastic and really finely cut steel and aluminium, but it doesn’t have a single label on it - nothing to be able to tell who made it and why.

Inside there is a Macintosh Plus motherboard and analog board, with a custom adapted SCSI hard drive, floppy drive and some controls such as reset and either volume or brightness. There is also a serial output on the back, which suggests this had some kind of industrial use.

The previous owner was given this about 5 years ago and was told it didn’t not work.

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Interesting...  I would start

Interesting...  I would start where I'd start troubleshooting a Mac Plus...  Check the power supply voltages, make sure the SIMMs are seated.  Check everything obvious like that.

 

Next I might buy a working Mac Plus.  They're common and fairly cheap.  See if swapping the analog board and/or motherboard from that into this makes it functional.  Mac Plus are kind of a dime a dozen, Apple made a LOT of them.  This is rare and interesting.

 

 

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