[A83] Re: Enhanced Basic


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[A83] Re: Enhanced Basic




> Mixing BASIC and assembly isn't very common on any of the Ti calcs, it has
> been done now and then. More like things that would 'backup' the
> screenbuffer in the APD-buffer and recall it again, shift the screen x (or
> y) pixels, etc.
> 
> For example (old style, Ti83, using Aurora API):
> PROGRAM:BLAH
> :1->V
> :8->A
> :15->B
> :80->C
> :40->D
> :prgmZAPI
>  => Draws a 'window' from (8,15) to (80,40)

New style, 83+:

:8->L      ;Left
:15->T     ;Top
:80->R     ;Right
:40->U     ;Under
:Asm(prgmWINDOW

does probably the same...

> Since it is possible to read from certain memory areas where exactly the
> TIOS has stopped processing the BASIC program that did a send(9prgm..
> [Ti83] or asm(prgm. [Ti83+]. you can let your program interact with the
> data in the BASIC program.
> 
> Now we can do (Ti83):
> PROGRAM:BLAH
> :Send(9prgmAPI:(8,15,80,40)
> 
> prgmAPI now reads from BASIC_cursor ($9146) where the BASIC program has
> ended, then reads from there what it should do:

That's cool!

> $10, ah! the opening parenteses
> $38,$2B, First number => 8
> $31,$35,$2B, Second number => 15
> $38,$30,$2B, Third number => 80
> $34,$30,$11, Fourth number + closing parenteses => 40
> 
> Now store new BASIC_cursor, and draw the 'window'.
> 
> Of coarse there needs to be error-checking, maybe if we don't read past
> the
> end of the BASIC prog. But this is basicaly what needs to be done.
> 
> > Adriaan Coosemans
> 
> Anywhere related to Tijl Coosemans?

brother, he said

> 	Henk Poley <><
> 
> 

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    Ronald Teune @School
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    http://ti.zeekoe.cjb.net
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