Date   : Thu, 01 Sep 1994 15:44:27 +0100 (BST)
From   : Mark Cooke <ee2015@...>
Subject: Re: BBC Mailing List

> Okeydokey; consider yourself on it! I have a copy of all of the mail sent 
> to it; I'll post you it if you like but I'd better warn you that it's 
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^     
> >600Kb. This also includes any mail sent to me personally on the subject 
> but it might be of use anyway.
> 
It would probably be useful.  I've been doing some more work
on my code.  I now have working modes 0-7, system via, keyboard.

I had quite a major breakthough on IRQ code - it appears that an IRQ
forces the break flag off.  This caused me a couple of hours headache
trying to work out why the keyboard/screen IRQs were being lost...(the
beeb indirects via the same vector, and then checks break - which was
still set from the last error...sigh).

Also, I have been running Citadel/Starship Command and most other fairly
basic bits of software.  Anything which uses split screens will not work
with my current graphics software.  However, I think rather than trying to
emulate the 6845 properly, I'll write some custom screen modes for the
emulator...

Have you managed to fix your 2^2 error yet?  I also suffered from this a
couple of weeks ago.  It was caused by PLA not setting C and Z (i think).

I have a friend who has been writing an Arc version of a beeb emulator. 
We have been working in tandem on his kernel, and his emulator now
supports just about all the features of the original beeb - except ADC. 
Jammy git can just pass most of the calls straight to the Arc O/S.

Hope your resits go OK.

Mark C