There's a question - since I can't get to the FAQs ATM can anyone tell me
which Mac monitor I can use with the ][GS? And the ][c+ for that
matter......
-----Original Message-----
From: Paul R. Santa-Maria [mailto:paulrsm@ameritech.net]
Sent: 06 August 2000 18:28
To: classiccmp(a)classiccmp.org
Subject: Re: Apple IIc+ boot disk for DOS3.3
> There are, of course, many other features in
the ROM; it's just a
matter of
> digging up the programming info. And (since
you have such a late
member of
> the ][ series) there are also features in
the hardware,
such as double-
> resolution text, low-res, and high-res
modes, that the
ROM was never
updated
to
handle.
How do you get at these modes? Are they in the IIgs, also?
Speaking of which, can you drive the IIgs graphics chip and
sound chip,
whatever they're called, from Applesoft?
The double-resolution text mode is 80-column mode, and can be
turned on
with PR#3. This mode is supported by the ROM.
The double low-res (twice as wide, not half as wide!) and
double hi-res
modes are not supported by the ROM. You can write BASIC
routines to use
them, but it is much faster to use assembly language routines
called by
BASIC. These modes are also in the Apple IIe and IIc.
The IIgs has super-res modes with hardware color fill
available. I am not
a IIgs programmer (I use mine as a IIe) but there may be ROM
routines in
the toolbox to support those modes. The same may be true for the IIgs
sound chip. I have seen a BASIC program that used the sound
chip, but all
it did was POKE the data into memory.
No Apple II has real support for even the built-in speaker in the ROM,
except for the Programmer's Aid #1 option for Integer BASIC
which had tone
routines.
Paul R. Santa-Maria
Ann Arbor, Michigan USA
paulrsm(a)ameritech.net