Date   : Thu, 11 Mar 1999 09:29:40 +0100
From   : "Mark Usher" <marku@...>
Subject: Re: Parity on Master ?

Hi

> Since I have only just joined, I missed Mark's tip.  Please
> can someone
> forward this to me.
Quite simple really - you have to slow the machine down due to a bug in the
Pascal compiler.
Here is the description as by Borland.com

----snip-----

Runtime Error 200 - 'Divide by 0'
Applications that use the CRT unit may generate this error message when
running on very fast machines (i.e. Pentium Pro 180 and above). The cause of
this error is a timing loop that occurs as part of the initialization of the
CRT unit. This timing loop counts how many clock ticks occur within the loop
and then that number is divided by 55. The result of this division is a
value that is too large to fit into an integer value. The 'Divide by 0'
error message is the catch-all error that is displayed when this overflow
occurs.

There are currently no Inprise endorsed patches for this problem. There are
several user provided patches available on the internet that patch both the
CRT unit as well as existing EXE files. The easiest way to obtain these
patches is to go to www.altavista.digital.com and search on '+ bp7patch.zip
+ tppatch.zip' without the quotes.

These patches are not endorsed or supported by Inprise and are used at your
own risk.

----end of snip----

Alternatively you can use a program to slow down the computer just got to
www.simtel.com and search the MSDOS archive for "slow" or similar.

> I have two other queries:
>
> 1) Does anyone have any experience of using a VGA monitor
> with a BBC, and
> if so can they spill the beans on how to connect it.
Very difficult to do and as yet I know of no-one who has acheived it.

> 2) I have acquired a BBC teletext adapter, but alas no
> software or manuals.
>  Can anybody help me on what else I may required to get this
> up and running  with my model B.
As far as I know you just need the Teletext ROM in your BBC. You can
download an image of this from
http://www.fortunecity.com/skyscraper/hirez/422/roms/acorn/fs/TFS-2.50.rom
You will then need to burn this into an Eprom to fit in the BBC, unless you
have sideways RAM to load it in. If you don't have Eprom facilities then
contact Chris Richardson http://www.karoo.net/8bs/ - I'm sure he'll be able
to help you out with a ROM.


Mark Usher