Re: A86: FindPixel in 84 cycles and 19 bytes!
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Re: A86: FindPixel in 84 cycles and 19 bytes!
I was the writer of that document. Logic would say that it's not used for
anything. TI has more than enough space for system variables from
$C000-$D748 because the TI-85 only had system variables from $8000-$8BF7.
That's 2897 more bytes! However, it is unofficial information, so don't be
sure about it.
I haven't seen any side affects from writing on it, just as long as you ret
from your program with that page there.
>
>On ticalc.org is a file called "86ports.txt". It contains (among other
>things) the following information:
>
>...
>---------------------------------------------------------------------------
---
>port 5 - Page change at $4000-$7FFF
>---------------------------------------------------------------------------
---
>port 6 - Page change at $8000-$BFFF
>---------------------------------------------------------------------------
---
>These two ports are very similar, the only thing to remember is this:
> port 5 memory area = $4000-$7FFF (second 16K of memory)
> port 6 memory area = $8000-$BFFF (third 16K of memory)
>
>...
>
>RAM page info - description
> $00 - The page permanently at $B000-$FFFF, this contains all of the
>system
> - variables, I think, and then space for running asm programs,
>then
> - the stack, then video memory
> $01 - page in use when asm program is called, I think most of it is
>not - used, so that us people making asm programs won't mess
>up things ;)
> $02 - The start of user memory, starts with xStat, and all those
> $03 - More user memory
> $04 - More user memory
> $05 - More user memory
> ...
>
>
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Alan Bailey mailto:bailela@charlie.cns.iit.edu
IRC:Abalone Web:nowhere at the moment
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