Re: Small favor - anyone in the UK make me a disk?

[David Wilson <mcs6502@gmail.com>]

On Sep 20, 3:32 am, j...@magrathea.plus.com (Jim) wrote:

> C205 is 18
> C207 is 38
> C20B to C213 is 48 98 48 08 78 20 CB FF BA
> C2FE to C2FF is 00 00

OK. This tells me that your card does not have the (more modern)
Pascal 1.1 Firmware Interface, only the older BASIC Interface.
C20B.C20C would have been 01 3x if it had. So there is no point in me
writing a simple terminal emulator that uses the Pascal (aka Advanced)
firmware calls.

> The serial card is a CCS7710  - you can see a picture of the actual card
> here: <http://www.ursaminorbeta.co.uk/notSoSuperSerial.jpg>

I have found a comms program called Point To Point which lists the
CCS7710A and CCS7711 as being supported cards but not the CCS7710.

Looking at the picture of your card I can see it uses a 6850 ACIA
(relatively common before the 6551) and has its firmware in two small
ROMs so I guess it only has 256 bytes of firmware.

It should be easy to write code that talks directly to the ACIA - back
in the days of 300bps modems I wrote such a program to drive my
homemade 6850 based card. I will have a look for it on the weekend
(don't hold your breath - I have not seen it in 20 years).