Re: Rarest Card

[Ralph <rwhyre@gmail.com>]

e p chandler wrote:
> On Oct 19, 3:03 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:
> > rhohler wrote:
> > > The NuMustang discussion got me thinking.  What is the rarest Apple II
> > > card today?  Of course, prototype cards are limited and rare but what
> > > production card.  I would bet on the Transwarp II card or something.
> >
> > I have some 128K bubble memory cards that emulate a Disk ][ with
> > somewhat less capacity.  They were made by Helix Labs, and were
> > intended to provide non-volatile storage for Apple II's used in
> > harsh industrial environments.
>
> I once considered using one of these in a project which buffered data
> from a multi-channel analyzer. The problem with the disk 2 is that it
> disables interrupts ([perhaps it was DOS 3.3....) The commercial
> solution to the problem used a clock card which itself generated
> interrupts. My idea was to write the data to bubble memory instead of
> to disk.
>
> As far as rare cards go, I did see a demo at a club meeting of an
> modem card that had a number of special abilities (no I don't live in
> silicon valley). It was never produced because it had a tone generator
> built in which would have turned the Apple into a blue box (yes I know
> the guys at MIT did it first!).
>
> ---- e