apple Lisa2. One working!! - one to go?

Tony Duell ard at
Sat Dec 11 15:37:28 CST 2010

> The guys that designed this machine knew how to make it human friendly.
> I don't know of any other machine of that era that did this, or even had
> a software controlled power supply.

THe PERQ 1/1a have software-controlled power swithces. You turn them off 
by a suitable OS command which flushes the disk buffers (if necesary), 
parks the hard disk heads, and then turns off the machine. These machines 
pre-date the Lisa.

Probably a bit later, but the Torch XXX and Whitechapen MG1 have software 
controlled power siwches too. In the case of the former you touch the 
power swithc (atually touch contacts) on the front of the case, it sends 
an interrupt to the servcice processaor which tells the main 68K to flush 
the buffers and then turns the machine off. The MG1, I think, is similar 
to the PERQ i nthat you shut it down with an OS command.


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