Jerrold 400 Series Full Service Modification
by 4x of Group 42
Introduction
This information is good for most Non-Addressable Jerrold 400 Series units.
Instructions
- Remove existing PROM, if any.
- Short wire-wrap posts 1 and 2 togeather. (#1 has yellow wire on it.)
- Connect pin 6 of the 4081 IC to pin 10 of the 4011 IC.