HP 3000/37 console

J. David Bryan jdbryan at acm.org
Tue May 8 12:50:45 CDT 2018

On Tuesday, May 8, 2018 at 0:36, Mike Loewen via cctech wrote:

>     Does anyone know if a non-HP terminal will work as the console for
> a HP 3000 Series 37?

Page 3-7 ("Minimum Requirements for Terminals") of the "Series 37 System 
Processing Unit Self-Paced Hardware Training Guide" (32450-90001 June 1984) 
begins with:

 * The system console must be connected to port 0 on the TIC installed in
   slot 1 (channel 1) of the SPU. MPE and DUS expect this configuration.

 * The ENQ/ACK handshake capability must be present.

That suggests that it won't.

> The power-on self-test uses ENQ/ACK to speed sense, but the manual also
> implies that it will sense speed from a <CR>.

Page 7-27 (functional description of the TIC) says:

   Speed sensing is accomplished by executing an ENQ/ACK handshake with
   the connected device.  [...]  If there is no response after
   transmitting at all [eight] of the baud rates, the PCC senses the
   line waiting to receive a Carriage Return.  [...]  When the Carriage
   Return is received, the PCC will configure the port for the baud rate
   of the sending device.

But perhaps this doesn't pertain to the system console, as it seems to 
contradict the requirement above.

                                      -- Dave

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