Re: A92: PROPOSAL: TI-89/92 Screen Library
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Re: A92: PROPOSAL: TI-89/92 Screen Library
As I already mentioned, because the row on a 92 is 30 bytes wide, and a row
on 89 is probably 20 or so, this wouldn't work. Also, when programming
calculators, you almost always write to video memory when you want something
other than text to show up on display. (Text is handed by ROM)
Daniel S Plaisetd wrote:
> I suggested a solution to the problem... make the screen buffer on the
> 89 the same size as the one on the 92... but only display 100x160
> pixels of it or whatever the size of the screen is. This would greatly
> help programmers... Another idea is if we use a PutSprite routine,
> which is different on both calculators. I _think_ that sprites are about
> the only time when you write directly to the memory... I dunno.
> Daniel Plaisted
> -dsplaisted@bigfoot.com
>
> On Fri, 20 Mar 1998 16:44:49 EST NDStein <NDStein@aol.com> writes:
> >
> >I have said this several times so far, but thank you for saying it
> again.
> >Assembly-92 members: Please just think about it, stop with the ideas
> like
> >that, it would be unreadable. I don't know how many people have
> suggested
> >things along those lines so far, but it wouldn't work. A full screen
> TI-92
> >program just would not work on the 89, that's all there is to it. Think
> about
> >this for a second. Say the ratio of the number of vertical pixels on
> the 89
> >to the number of vertical pixels on the 92 was 3:4. Then a 92 program
> would
> >have to take four pixels and squish them into the space of three. Say
> the
> >pixels on the 92 screen were alternating black, white, black, white.
> What
> >would you change this to on the 89? The only possibility I can think of
> is
> >programs that are written for the 89 and displayed as centered in the
> 92's
> >screen. This would require a library and many library calls, hence very
> slow.
> >Most programs use direct memory access for graphics (on the calcs
> anyway). On
> >the 92, a row is 30 bytes. On the 89 I think it would be 20 bytes. So
> you
> >can not just change the address. I don't like having to put down
> everybody's
> >ideas, but I'd rather do that than have some kid go off and work on a
> >graphics
> >library that is very slow and no one uses.
> >
>
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