Date   : Thu, 25 Oct 2007 00:30:48 +0100
From   : pete@... (Pete Turnbull)
Subject: Teletext adaptor ROM?

On 24/10/2007 23:59, Adam Sampson wrote:

> By comparison with the other one, I assume IC51/101 are BASIC and DFS
> 1.20. The owner's apparently got an Acorn teletext wedge around
> somewhere but doesn't know if he's got the ROM for it; does anyone know
> if IC88 is one of the teletext filing system ROMs -- or, if not, what it
> might be?

PB04 is the MOS and PB05 is BASIC-II.  HN613128 is just the root Hitachi 
part number for a 128Kbit mask ROM, and 8322 and 8308 are the date 
codes, 1983 weeks 22 and 8 respectively.

201666 is the DNFS ROM.  It contains DFS 1.20 for the 8271 disc 
controller,and NFS 3.60 for Econet, along with the Tube code for second 
processors.  If either the 8271 or Econet are not fitted to the machine, 
the relevant filing system will not show up.

> *TELETEXT produces "Bad name" (whereas on my DFS 0.90 machine it
> produces "Bad filename"). *HELP just lists "DFS 1.20 / DFS / UTILS / OS
> 1.20".

The different error message is probably just due to the different 
versions of DFS that are trying to interpret the command.

The TFS ROM for the Teletext adapter, also known as the PD93 ROM, is 
part number 201,609.  I've got a binary dump of it if that helps (I can 
convert it to an Intel hex file).

-- 
Pete                                           Peter Turnbull
                                               Network Manager
                                               University of York