PET problem SOLVED!

From: Gordon JC Pearce <gordon_at_gjcp.net>
Date: Sat Aug 14 04:23:25 2004

Dave Dunfield said:

> Checking the Schematic, bit 1 of the low memory bank is U17 - pulled it,
> put in a
> socket (always!) and stuffed another 4116 - voila!!! it came right up!

Ah... 4116es! How much money did I make at school, fixing ZX Spectrums
that had weird black-and-white stripey stuff on the screen..? Almost
always, you'd find that one of the eight 4116es had failed, and was
(coincidentally) pulling the +12V line from the dinky little chopper PSU
down, which also fed the chroma modulator... Hence the black and white
screen.

Gordon.
Received on Sat Aug 14 2004 - 04:23:25 BST