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18887Re: WTD-serial terminal

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  • Mike
    Nov 7, 2010
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      Hi Richard,

      There are several issues with producing an encoded ASCII to PS2 keyboard interface converter, so I'd be surprised to see one made.

      1) You may have a couple of encoded ASCII keyboards, but the keyboards are rather scarce, which limits the market. Quite a few Apple-1 clone builders end up scrounging them from complete Apple II plus computers.
      2) Sequences like control-alt-delete being held down on a PS/2 keyboard would be tricky to replicate, because a typical parallel ASCII keyboard interface doesn't present state information about a key being currently up or down.

      I have made a batch of adapter kits that go the other way, PS/2 keyboard to parallel ASCII, but that was done primarily because of 1) above. I think Vince put a PS/2 interface on his replica-1 for the same reason.

      Regards,
      Mike Willegal

      --- In midatlanticretro@yahoogroups.com, Richard Cini <rich.cini@...> wrote:
      >
      > Ok, one more thought. Does anyone know of a reasonable parallel-to-PS/2
      > converter? I have an ASCII keyboard or two laying around and with the proper
      > encoding could be used with the PS/2 interface on the Pocketerm. I did some
      > searching and there are quite a few for MAME arcade build-outs (I have one),
      > but they use discrete switch inputs to ground and convert it to a keyboard
      > character.
      >
      > More Googling ahead...
      >
      >
      > On 11/2/10 7:45 PM, "Richard Cini" <rich.cini@...> wrote:
      >
      > > On 11/2/10 8:17 AM, "Gene Buckle" <geneb@...> wrote:
      > > On Mon, 1 Nov 2010, Richard Cini wrote:
      > >>
      > >>> > Gene --
      > >>> >
      > >>> > Actually I looked into it after I saw this email. It¹s a great item but
      > >>> > unless ³packaged² correctly, it looses something in the look and feel
      > >>> area.
      > >>> > I guess with the right keyboard (like an IBM ³clicky² keyboard) and a
      > >>> custom
      > >>> > case (like the MAME arcade kind of thing, but desktop), it could result in
      > a
      > >>> > good reproduction. The second serial port is a bonus, as you can use that
      > >>> > (hopefully) as a paper tape input.
      > >>> >
      > >> It almost begs a nice wooden enclosure that would replace the Model M
      > >> keyboard case as well as provide a housing for the PCB and maybe a 14"
      > >> LCD. :)
      > >>
      > >
      > > Look at this: eBay item 150514710557. It¹s a Heath H9 terminal. Not being a
      > > Heath guy, I didn¹t know this existed. It¹s about the right form factor,
      > > approximately, for a hacked together Pocketerm and 14² LCD monitor. The case
      > > could be wood and metal like the SOL or maybe something else. Hmmmm....
      > >
      > >
      > > Rich
      >
      > --
      > Rich Cini
      > Collector of Classic Computers
      > Build Master and lead engineer, Altair32 Emulator
      > http://www.altair32.com
      > http://www.classiccmp.org/cini
      >
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