Re: A89: Re: Re: LCD change for $1 =)
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Re: A89: Re: Re: LCD change for $1 =)
It should be perfectly safe. I almost always do it, to not have to care about
clipping in my spriteroutines. (I use my own grayscale routines though, but it
should work nice in graphlib too)
If I don't do that, I probably change the screenwith, to make the screenbuffer,
160 pixels (20 bytes) wide, instead of the 92-compatible 240 pixels (30 bytes)
wide. This VTI isn't supporting. Rusty havn't been able to give me a straight
answer on why yet. I guess he is just fed up with people asking him a lot of
stupid questions, and doesn't even care anymore.
I think (from the brief check on the code) that it maybe is a bit tricky, if he
does what I think, and initializes a bitmap-buffer at startup, for the screen.
could be problems to change this in runtime, and he probably have to rewrite a
lot of the displaysystem to support changeing it in runtime, and probabaly he
doesn't think it is worth it. almost noone is useing it, but there are actually
some quite big advantages.
//Olle
Miles Raymond wrote:
>
> Hmm... So in this case, If I would like to use greyscale also, I should just
> change the values in graphlib::plane0 and graphlib::plane1? Is this safe to
> do, or are there other implications for tampering with graphlib?
>
> -Miles Raymond EML: m_rayman@bigfoot.com
> ICQ: 13217756 IRC: Killer2 AIM: KilIer2 (kilier2)
> http://www.bigfoot.com/~m_rayman/
>
> ----- Original Message -----
> From: Niklas Brunlid <e96nbr@efd.lth.se>
> To: <assembly-89@lists.ticalc.org>
> Sent: Thursday, November 04, 1999 8:10 PM
> Subject: A89: Re: LCD change for $1 =)
>
> > > This is the first time that I've actually asked for help from the A89
> list
> > > in quite a long time. What I want to know is how to shift the address
> of
> > > the actual LCD.
> >
> > $600010 contains the address where the LCD hardware reads its data,
> divided by
> > 8. It's write-only.
> >
> > > Also, will this work w/ VTI, or is this the thing Olle complains about?
> >
> > Grayscale relies on this, and grayscale works in VTi... I haven't had any
> > problems with it.
> >
> > / Niklas Brunlid
> > Check out Prosit for the TI-89 / TI-92+ at http://prosit.ticalc.org
> > Random PQF Quote follows:
> >
> > "I can explain it in Dog, but you only listen in Human."
> > -- Gaspode the wonder dog
> > (Terry Pratchett, Moving Pictures)
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