Date   : Mon, 24 Jan 2005 15:27:03 +0000
From   : Jules Richardson <julesrichardsonuk@...>
Subject: Re: Need Help Identifying Parts Of My BBC Catalogue

On Mon, 2005-01-24 at 14:34 +0000, Charles Blackburn wrote:
> Also A Whole Heap of schematics

Hmm, define 'heap' :-) Seriously, it's worth seeing what you has as
there might be something useful (I've got the ones for the Torch 68k
board for instance, but I'm still looking for the Z80 ones)


> Other Chips
> These are various chips I have too, I'm not sure what some of these are,
> mayb you can tell me:

Going from memory here!:

> Hitachi 8313 - HN613128PB05 (c) Acorn
> Hitachi 8322 - HN613128PB04 (c) Acorn
> Hitachi 8317 - HM613128PB04 (c) Acorn

I think one of those is the beeb OS, the other BASIC, but I can't
remember which way around... 

> Hitachi 8627 - HM6264LP-15 - UO422880 (2 off)

Sounds like memory - large or small chips? Smaller ones are *usually*
DRAMs and larger SRAM found in old 80's micros.

> SAA 5050

Teletext I believe.

> F68B54P - 8313 - Phillipines

Econet IIRC

> Various TI TMS4164-15NL, hitachi HM 4864P-2 (I am assuming these are
> SRAM chips)

DRAM I think - 64k x 1 bit and 64k x 8 bit

> Hitachi 3D1 - HD46505SP - HD6845SP

CRTC chip (i.e. video)

> R6522POI (6522-31)
> 8325 - SY6522 (same as above I assume just a diff make)

dual-port interface ICs I think.

> Numerous Hitachi HM6116P-3's

More SRAM memory

http://www.datasheetarchive.com is a very good (free) resource for
datasheets by the way.

> I would love to get the Z80 co processor working and I am assuming it's
> a torch version as per the eproms, but I have no other software for it.
> I know  I can prolly get it from 8bs, but does any1 have a spare disk
> drive etc that they no longer require and are willing to part with?

Torch ones were usually mounted inside the BBC itself, whilst Acorn ones
sat in a typical second processor box. I've definitely got floppies, but
not disk images - I'm not sure if they're a standard BBC format either
(i.e. transferrable via Xfer).

There are two versions of the Torch copro - standard with just a Z80
CPU, and then the 'Tosca' board that has a high speed serial interface
local to the Z80's bus. The latter seem to be horribly rare (it's
possible they were only sold with Torch machines that used the BBC as
I/O, rather than being sold as an addition to the BBC)

cheers

Jules