Date   : Mon, 23 Jan 2012 16:44:33 +0000
From   : afra@... (Phill Harvey-Smith)
Subject: Help figuring out ICs and ROMs for BBC (B or Master)

On 23/01/2012 16:24, stuart wrote:
> I am not sure but IIRC the HD486A21P is a video ULA.

You mean HD468A21P ?

This is a 6821 PIA as used in lots of things including the Dragon 32/64 
and Tandy Colour computer.

I think some of the early Acorn System machines' cards may have used it 
also.

Cheers.

Phill.