RS232 Communications HP9000 Series 320

Paul Berger phb.hfx at
Sun Jul 7 00:05:25 CDT 2019

When you say it is a DB9 I am guessing that you are using the serial 
port on the 320's interface card, the port is supposed to be the 
equivalent of a 98644 serial card.  In the manual 
98561-90020_series300configRef_Aug85 I found a pinout of the RS-232 
connector on what is reputed to be the 320 human interface card.  I have 
had a little experience with HPL and wonder what software you are using 
on the 9000 side to send the data.

You may also want to ask for advice on the VintHPcom group on 
for advise as that group specializes in early HP computers up until the 
68K 9000s like the 320.


On 2019-07-07 12:18 a.m., Roger Addy via cctech wrote:
> Hi All,
> First post here.  I have a HP9000 Series 320 computer with a HP Drive 
> system.  It uses the HPL 2.1 (I think) operating system. I'm trying to 
> get some ASCII files out of the system using the RS232 port.  The port 
> is female DB9, so I'm assuming it's DCE.  I got an HP cable DB9 to 
> DB25 which reorients the pins to PC standard RS232 DTE.  I can get a 
> connection with the HP. but when I try to send a file it just shows 
> the word "PROMPT" on the PC. I'm not sure what to do at this point.  
> I'm currently using Tera Term.  Any advice is appreciated.
> Roger Addy
> ---
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