> -Original Message-
> From: Tony Duell [mailto:ard.p850...@gmail.com]
>
> On Wed, May 5, 2021 at 8:12 AM Paul Birkel wrote:
> >
> > > -Original Message-
> > > From: Tony Duell [mailto:ard.p850...@gmail.com]
> > >
> > > > On Tue, May 4, 2021 at 10:33 AM Paul Birkel via cctalk
> >
On Wed, May 5, 2021 at 8:12 AM Paul Birkel wrote:
>
> > -Original Message-
> > From: Tony Duell [mailto:ard.p850...@gmail.com]
> >
> > > On Tue, May 4, 2021 at 10:33 AM Paul Birkel via cctalk
> > > wrote:
> > >
> > > I'm currently reverse-engineering an AMPEX keyboard that uses capacitiv
> -Original Message-
> From: Tony Duell [mailto:ard.p850...@gmail.com]
>
> > On Tue, May 4, 2021 at 10:33 AM Paul Birkel via cctalk
> > wrote:
> >
> > I'm currently reverse-engineering an AMPEX keyboard that uses capacitive key
> > switches. The basic design employs a GI encoder coupled
On Tue, May 4, 2021 at 10:33 AM Paul Birkel via cctalk
wrote:
>
> I'm currently reverse-engineering an AMPEX keyboard that uses capacitive key
> switches. The basic design employs a GI encoder coupled to an 8039 MCU
> supplemented by a 2K EPROM and 74LS373 (used to latch the ROM address set
> fro
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Al Kossow
> via cctalk
> Sent: Tuesday, May 04, 2021 9:48 AM
> To: cctalk@classiccmp.org
> Subject: Re: General Instruments Capacitive Keyboard Encoder
>
> On 5/4/21 2:33 AM
On 5/4/21 2:33 AM, Paul Birkel via cctalk wrote:
I'm currently reverse-engineering an AMPEX keyboard that uses capacitive key
switches.
did all of the square foil and foam pads disintegrate in it?
I'm currently reverse-engineering an AMPEX keyboard that uses capacitive key
switches. The basic design employs a GI encoder coupled to an 8039 MCU
supplemented by a 2K EPROM and 74LS373 (used to latch the ROM address set
from Port A while Port A is then used to read data back from the ROM). The
