Date   : Mon, 08 Sep 2003 10:18:43
From   : "Bob Devries" <bdevries@...>
Subject: Re: newbie question

Mike wrote:

> >10 *TV 0,1
> >20 mode 2
> >30 repeat
> >40 gcol 0,rnd(15)
> >50 plot 85,rnd(1279),rnd(1024)
> >60 until 0
>
> That looks familiar :)  It's my "Beeb soak test" program.

Yeah, I think it was.

> It should draw random triangles all over the screen in different
> colours, some flashing.  To more comprehensively test the video, add a
> line 55 P. "ON TEST".  This will cause the screen to scroll upwards too,
> forcing the hardware to deal with differing "start of screen memory"
> addresses.

Mmmm, I can see that it draws *something* but triangles it aint. It is
broken up by bars of solid colour, and sometimes black.

> It might.  Can you stick it on a website instead of mailing it?

I'll see what I can do.

My biggest worry is... The *exact* same fault was described by Andrew Davie
back in Feb'98 here:
http://nelsonit.net/~jon/BBCMicro/1998/02/25/214355.html

Andrew is (or was) also an Aussie. I wonder if I've somehow ended up with
his (unrepaired) BBC-B?

I'll continue bashing at this 'til I get it working.

Regards, Bob Devries; Ipswich, Qld, Australia