Date   : Mon, 24 Jan 2005 18:16:38 +0000
From   : Mike Tomlinson <mike@...>
Subject: Re: Need Help Identifying Parts Of My BBC Catalogue(LONG)

In article <000001c5022f$ce447ac0$0500a8c0@...>, Charles
Blackburn <charlesb@...> writes

>Well thnx for that jules, the z80 bord I have has got the follow ic's on
>it:
>
>Z80, mitsubishi 83160 - M5L8255AP (uart iirc) - R6522AP (PIO?) and
>various other logic chips

The Torch Z80 is remarkably simple.  All it has is the Z80, a CCCP ROM,
two VIAs are used (they did this to save money instead of buying Acorn's
Tube chip.)  The 6522 connects to the BBC's Tube and the 8255 connects
to the Z80.  The 8-bit data path between the two back-to-back VIAs
provides the Tube data path.

There's also a crystal, eight 4164 or 4864 RAM chips, and a couple of
pieces of glue TTL.  That's it.

-- 
.sigmonster on vacation