[comp.os.cpm] Kaypro II needs help!

rzh@LLL-LCC.LLNL.GOV (Roger Hanscom) (08/29/90)

Hello All --
Any Kaypro II users out there??  I've got one that acts like someone's
leaning on the three key.  When I power it on, the "A>" prompt comes up,
but then a line and a half of threes follows.  CP/M tries to interpret
that as a command line, echoes it back (followed by a "?"), and then the
whole thing starts again.  It does this with the keyboard disconnected
also.  Once I got CP/M to come up clean, but then the first key I pressed
filled the screen ("D" from "dir").  I've got no schematic, so I haven't
much of a clue where to start to look.  Anybody seen this before??  Does
the keyboard (serial) go in via a PIO, SIO, or a TTL 8-bit serial shift
register (74LS164 ??) ?  Any comments would be appreciated.

              roger           rzh@lll-lcc.llnl.gov
                              rzh@icf.llnl.gov

mwilson@crash.cts.com (Marc Wilson) (08/30/90)

In article <9008281713.AA29044@lll-lcc.llnl.gov> rzh@LLL-LCC.LLNL.GOV (Roger Hanscom) writes:
>
>Hello All --
>Any Kaypro II users out there??  I've got one that acts like someone's
>leaning on the three key.  When I power it on, the "A>" prompt comes up,
>but then a line and a half of threes follows.

Sounds like a similar problem I had with another SBC...

>Does the keyboard (serial) go in via a PIO, SIO, or a TTL 8-bit serial shift
>register (74LS164 ??) ?  Any comments would be appreciated.

The keyboard is served by one of the two SIO chips you see on the motherboard
of the machine.  For the II-83, it's the chip at U70.  For the 2/84, it's the
chip at U11.  Replace it, and see if your problem goes away.  Mine did.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Marc Wilson
     ARPA: ...!crash!mwilson@nosc.mil
           ...!crash!pnet01!pro-sol!mwilson@nosc.mil
     UUCP: [ cbosgd | hp-sdd!hplabs | sdcsvax | nosc ]!crash!mwilson
     INET: mwilson@crash.CTS.COM
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Marc Wilson
     ARPA: ...!crash!mwilson@nosc.mil
           ...!crash!pnet01!pro-sol!mwilson@nosc.mil
     UUCP: [ cbosgd | hp-sdd!hplabs | sdcsvax | nosc ]!crash!mwilson
     INET: mwilson@crash.CTS.COM
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

etrmg@levels.sait.edu.au (09/01/90)

> the keyboard (serial) go in via a PIO, SIO, or a TTL 8-bit serial shift
> register (74LS164 ??) ?  Any comments would be appreciated.
> 
>               roger           rzh@lll-lcc.llnl.gov
>                               rzh@icf.llnl.gov


Hi:  In the 84 model I have there are 2 SIO's.  The keyboard uses half of one.
I'm not relly sure of the old units, but I have a schematic & I'll get back to
you on it.  As I recall, the 83 units only have one serial on the back panel
and no internal modem. So, I'd assume that one half of the SIO is for the port
and the other half is the keyboard.  That might get you going.  Catch up with
you soon. . .   Ronn