Alternative Monitor for VAXmate

Rob Jarratt robert.jarratt at
Sat May 23 08:45:45 CDT 2020

As it looks like I am not going to be able to repair the monitor board for
my VAXmate I am wondering if I can do anything with the outputs from the I/O
board to drive an external monitor instead.


The connector to the monitor board has RGB+Intensity outputs at TTL levels.
The horizontal sync has a frequency of 26.6KHz, active low with the high
voltage 3.7V, Vertical sync is 60Hz. I don't believe that corresponds to any
known standard, does it?


I had a go at building this
adapter.jpg feeding its output to a composite to VGA device to see if it
would convert it to VGA, but no luck.


Any ideas?





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