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From: wei@tiger.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: question about the response of HP plotter
Message-ID: <188@tiger.Princeton.EDU>
Date: Thu, 28-May-87 21:42:08 EDT
Article-I.D.: tiger.188
Posted: Thu May 28 21:42:08 1987
Date-Received: Sat, 30-May-87 08:03:22 EDT
Organization: EE, Princeton University
Lines: 12
Keywords: plotter

I tried to send a string 'IN;SP 1;PA 500,1000;' to a HP plotter (7470)
using assembly language and using BIOS call 14H with ah=1.
The string is a HP-GL command asking the plotter to be initialized and
select pen 1 and then goto position 500,1000.
The plotter has no reponse at all if I send the string characters one
by one succesively.
However, it reponds correctly if I put a delay loop ( for about 1ms )
after each character.
Is this situation normal? The HP plotter needs some time to put the
coming character into its buffer before it can receive the next one !
Or I am doing something wrong ?!
HP Wei     wei@princeton.UUCP