General Category > LisaList2

Lisa 1 to 2 upgrade instructions addendum

(1/1)

ried:
Here's a copy of the Level 1 Lisa Technical Procedures #072-0085 manual dated September, 1984. There's an interesting loose page floating in the back, which provides an update on the Lisa 1 to 2 upgrade procedure.

First, the CPU ROMs were no longer included in the upgrade kit. This is surprising, because I thought some later versions of LOS were not supported by C or D ROMs.

Second, installers are instructed to remove a second resistor (R41) from the I/O board. Apparently, for some period of time R47 was the only one removed during the upgrade process. That also seems a bit odd.

sigma7:

--- Quote from: ried on October 16, 2025, 10:01:13 pm ---Installers are instructed to remove a second resistor (R41) from the I/O board.
Apparently, for some period of time R47 was the only one removed during the upgrade process.

--- End quote ---

Removing R47 is associated with switching from the Twiggy to 3.5" floppy drive.

Removing R41 was a tweak to address ProFile issues.

Navigation

[0] Message Index