Re: ][+ Video card question(s)

[dempson@actrix.gen.nz (David Empson)]

In article <T8iJsc5w165w@tlp.apana.org.au>,
Peter Maloney <peterm@tlp.apana.org.au> wrote:
> David Empson sez...
> "Double hi-res graphics needs an additional 8k of RAM in the auxiliary
> bank.  The II+ has no hardware support for auxiliary memory.  Its
> video circuitry probably doesn't support double hi-res either.
> --"
> Have you read Don Lancaster's book? The first one, that is?

No.  What is it called?

> There's a hardware hack in there that, from memory, does strange and
> impossible things to a II+ display. Maybe this is what the person had
> in mind?  It was all done with bits of wire, I think...

I still find this hard to believe.  I can see that the potential is
there - the II+ does have a 14 MHz clock, for example.  It already
uses double the horizontal clock speed when drawing low resolution
grahpics.

Can anyone give me the details of the modification?  

Whatever it is may produce double resolution graphics, but it won't be
software compatible with the IIe/IIc/IIgs double resolution modes.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand