Date   : Wed, 21 Feb 1996 11:03:05 GMT
From   : lamcw <lamcw@...>
Subject: Re: Filing systems & Repton problems

Tom seddon wrote:

;I've now got my BBC emulator working pretty well. By skipping every other 
;frame I get about 550,000 instructions per second on my 486-80, which is 
;very slighly slower than a real BBC.

Is yours DOS or Windows? 



; 1. Write my own filing system
; 2. Write an 8271 emulation
; 3. Use DOS files as BBC files (With an additional header/catalogue file)

I trap certain OS calls to give a high speed 'cassette' system. All files
have a 10 byte header.

Anyone any ideas how to implement the disk FS easily? :)


;2. Repton--this is rather odd. Even when rendering every frame the game 
;jerks and flickers something awful.

Repton probably scrolls the screen during VBI. Try drawing the screen
at other points during the frame, i.e. before or after the scroll but
not during.


Chris Lam,
MacBeebEm Keeper.