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Re: What GSE-Reactive Really Needs to Make

mspangler wrote:

VGA would be nice, but I wonder if s-video would be good enough for
clear 80 column text.


It certainly could be for text where the primary contrast is in
luminance.  If the contrast is in hue, then S-video still limits
the chroma bandwidth too much.

So white-on-dark blue text would be OK, white-on-black would be
perfect, and green-on-red would be almost unusable.


As for keyboards, there seems to be no shortage of ADB keyboards still
available. I think you can even get new ones.  So the GS is covered.
GSE already sells replacement Apple IIe keyboards.

USB might be nice for key drives, but the various CFFA cards have that
functionality covered too. The two widgets I need for personal projects
are;


I agree.  Both of these functions are well covered, and anything
more is just a convenience factor (for KVM switches, for example).


First, an adapter to get from the oddball 28 pin 128 k PROM on a ROM 0
GS to either a standard 32 pin eprom or a pair of 64k eproms (I have
lots of those) and I assume an inverter to choose between the chips.
Then I can upgrade it.

Second, a clone of the IO32 card Applied Engineering once made. I
probably can wire-wrap a 6821 and get it to work (I have lots of them
too), but having two of them and some easy to use ampersand routines to
run the things would be nice.


Interestingly, the Mockingboard has two 6522s and so is already a
fine IO32 card if provided with connectors (if you pull the sound
chips ;-).


 Analog Input I have running using the voltage input box from the
better mousetrap book (www.vernier.com) which I modified to use the
cassette input port on a IIe. The Chaos book from vernier shows how to
use a serial ADC chip, and a DAC chip from the annunciators, but there
are only four of them, after all. And only the three or four
pushbuttons for the digital inputs.


If bandwidth is not an issue, there are simple serial "expander"
chips available that can multiply the number of inputs and outputs
at the expense of some bit-banging.


While I'm wishing, a Mac version of Ciderpress would be nice too. :-)

Mike S.


omashi...@yahoo.com wrote:


What we really need GSE-Reactive to make is some sort of VGA output for
the GS and also some adapter so we can use USB keyboards.

We can now use modern disk drives with the various CFFA cards, now we
just need to be able to use modern video and input devices. The VGA is
probably the most important as then we don't have to have dedicated RGB
monitors for our machines.

-Adam






--

-michael

Music synthesis for 8-bit Apple II's!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
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