Re: Apple II Ext 80 column and RGB manual and disks

[pitz <pitz.wong@gmail.com>]

On Aug 18, 9:59 pm, A2Aviator <a2avia...@gmail.com> wrote:
> It's the same card - Apple simply sold a slightly different card in
> the end, but if you look at the manual cover you can see where the
> "Apple Computer" is a sticker - placed over where it said "VIDEO-7" in
> the square italic style logo.
>
> All that stuff was done by Walt Broedner and marketed by Video 7
> mostly, except the AppleColor 100 card and monitor.

Reviving this old thread a little bit -- how does the video part of
the Ext 80 Column RGB card work?  Does it have its own video circuitry
(including the char generator) and does it read the video memory on
its own, independent of that from the main board video circuitry?

Reason I asked is I've been playing with this Teknika RGB card (which
I think is also licensed from Video7 like the Amdek RGB cards).  It
seems to behave the same way as the video part of the Ext 80 Column
RGB card.  However, it sits in slot #7, which frees up my AUX slot for
other kinds of memory cards (RamWorks III, for example) or even
another Ext 80 Column RGB card.

If the video circuitry for these cards are independent, can the cards
be somehow modded to ALWAYS read from page 2 of video memory?  That
is, ignoring the PAGE2 softswitch setting?  Then with a couple of
cards -- I can have a multi-monitor setup (one displays from page 1,
and the other displays from page 2).  Of course, no existing software
can make use of it; and certain software that use page switching for
scrolling and such will break.  But still...

/pitz