SGI Personal Iris 4D/35

Kyle Owen kylevowen at
Sat Feb 9 12:52:53 CST 2019

I've got a graphics issue in my 4D/35, and I suspect it's a VRAM chip. I've
got vertical lines appearing on the screen, but not everywhere on the
screen; that seems to hint at an issue with one buffer having bad memory.
It was especially evident in the flight simulator demo, where alternating
frames flashed with and without lines.

The ever helpful self test says, "ERROR: Failure detected in the
Electronics Module (graphics). press <Enter> to continue".

The system is equipped with the ZB3 and BP4 on a GR1.2.

How can I better diagnose this issue? There are so many RAM chips soldered
on these three boards. Tracking it down to a single chip sure would be



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