Date   : Mon, 04 Feb 2002 15:50:30 -0000 
From   : Seddon Tom <TSeddon@...>
Subject: Re: Firetrack

>From memory:-

It fiddles R5 to move the screen down by 1 scanline at a time.

Note that on a real Beeb there you have to jump through hoops to do this.
However, if you just start drawing the Beeb's screen at the PC scanline
indicated by the contents of R5 you will get the desired effect.

Fiddle if it looks wrong -- the above is the basic idea.

-- 
--Tom
tseddon@...                      icq 47064827
sheffield england united kingdom planet earth

> -----Original Message-----
> From: Tom Walker [mailto:tommowalker@...        ]
> Sent: 04 February 2002 15:47
> To: bbc-micro@...         
> Subject: [BBC-Micro] Firetrack
> 
> 
> Does anyone know how Firetrack's scrolling works? I'm trying 
> to fix it in 
> B-em (it's jumpy at the moment).
> 
> Tom
> 
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