[rescue] Use of old Sun VME framebuffer boards...

Josh Dersch derschjo at gmail.com
Sat Feb 13 20:32:53 CST 2016

Hi all --

I have a cgthree (9U VME framebuffer) I'm attempting to get running as 
the system console and I'm not having much luck.  I've tried it in both 
a Sun-3/150 and a Sun-4/110 with the same results -- no output on the 
display (not even a sync, as far as I can tell).

Having never really dealt with these framebuffers before (in these 
machines previously I've either used the built-in mono framebuffer or 
the serial consoles) I wanted to make sure I'm not missing anything 
obvious.  I've set the appropriate EPROM values (set 0x1f to 0x12 which 
if I'm reading things right should set the console to a VME framebuffer) 
and I've jumpered the backplane properly for the slot.  I've also 
checked the jumpers on the cgthree against the hardware reference and 
everything looks good.  If there's anything else I need to to do, let me 

I've no idea if this board even works as I've never used it before, so 
it's fairly possible that that's my problem, but I wanted to rule out 
operator error first.


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