Date   : Fri, 12 Jun 1992 09:27:30 BST
From   : RWF Whitehand <R.W.F.Whitehand1@...>
Subject: Re: Screen memory

>  >      
>  >      Which reminds me... how many of you out there realised that there
is some
>  >      hidden memory *after* the screen memory and *before* the ROM starts, in
>  >      modes 3, 6 and 7? I haven't seen this in a magazine before, and I don't
>  >      believe it is documented as such in the Advanced User Guide.
>  >      
>  >      Mode 7 is allocated exactly 1024 bytes for display but needs only 1000
>  >      at a time (ie. 40*25 characters), so there are 24 bytes free from
>  >      &7FE8-&7FFF.
>  >      
> 
>   I thought that mode 7 used those 24 bytes. Didnt Richard (challenger) mention
> this on Monochrome?
> 

Erm, it won't be used if you use software scrolly, etc. as he suggests
later on in his message...however, I'm not into arcade games in Mode 7 :-)
Its use is a little restricted...esp. as it probably gets cleared after a
CLS (quicker for the OS to clear in sensible junks, I'm sure) and is 'miles'
away from other useful RAM, etc. anyway.

Regards,

Richard.

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