Installation

Installation of ReTuLa in your (Acorn) Second Processor proceeds as follows.

1) Disconnect your Second Processor from both the mains and your BBC, and open it up.

2) Locate the Tube ULA, and replace it with ReTuLa. Note the correct orientation (see below).

The equivalent orientation of the Tube ULA and ReTuLa is as follows :

In both cases, pin 1 is located in the upper left corner of the picture.