Date   : Fri, 16 Aug 2002 09:48:26 +0100
From   : Seddon Tom <TSeddon@...>
Subject: Re: Firetrack emulation again

> -----Original Message-----
> From: Michael Foot [mailto:mjfoot@...] 
> Sent: 15 August 2002 22:33
> To: james@...
> Cc: bbc-micro@...
> Subject: Re: [BBC-Micro] Firetrack emulation again
> 
> Do you know how the CRTC is told there is only 8 lines of 
> data? I'll like to be able to emulate this properly.

It's one of the 6845 registers. R7 or R6, I vaguely remember, and it's
called scanlines per character line or something similar. It is set to the
number of scanlines in a character row less one, and if it is greater than 7
then the extra lines come out black.

--Tom