You would have to be an elite hardware technician to know how to mod a 128K to handle 800K drives, more RAM and any other additional features like SCSI.

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I could do that easily and I am lousy at "real world" electronics. The procedures are well recorded (thanks, Tom Lee and Larry Pina) for the simple stuff. For the more complicated SCSI stuff, do a search for "John Bass" & Mac & SCSI.

One of my non-elite technicians (but personable, communicative and an organisational asset) is on leave today (partially) to fix his VCR. Upgrading a 128 or 512K Mac is a much easier project.