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April 2021, Week 3

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Subject:
Re: [EXT]: HP3000 print spooler comminication protocol
From:
Frank McConnell <[log in to unmask]>
Reply To:
Frank McConnell <[log in to unmask]>
Date:
Fri, 16 Apr 2021 12:52:41 -0700
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On Apr 16, 2021, at 12:22, James B. Byrne wrote:
> What protocol does the HP3000 use to talk to network printers?

I was wondering if MPE/iX ever got LPR support.  If not, and based on Keven’s example, I am guessing it is using “port 9100” protocol as popularized by LaserJets, which basically replaces the serial or parallel port with a TCP connection to port 9100.  There’s not a lot of protocol, you just send text or PCL or PostScript down the socket and shutdown() and close() it when you’re done.

-Frank McConnell

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