Mac IIsi - SoG?

Jules Richardson jules.richardson99 at
Tue Oct 27 21:30:58 CDT 2015

On 10/27/2015 09:18 PM, Al Kossow wrote:
> here is a mirror of the tech note that describes the pinouts and sense codes
> The RBV ASIC in the SI only knows about the original 8 sense codes.

I just got it running a minute ago! I found a note on Herb's 
retrotechnology site:

"The newer Macintosh II Video Cards and Macintosh IIci built-in video 
require that pin 4 (SENSE0) be connected to Ground to signal the connection 
of a 640 x 480 monitor. Do not connect pins 7 or 10 as they are unused on 
original Macintosh II Video Cards and there are built-in pullup resistors 
on the newer Macintosh II Video Card and Macintosh IIci to terminate these 
pins when not in use."

... and leaving 7 & 10 nc, and grounding pin 4 has indeed kicked it into 
life (currently running on an ELO touchscreen LCD, it remains to be seen 
whether any of my other LCDs or CRTs have problems with it)



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