ncoplin_at_orbeng.com
Date: 2004-05-21 08:12:09
Hi Jim,
Sent some reference material to you as an attachment in a private email.
Normal protocol is as per the basic example, but keep in mind that some
programmers do strange things such as sent multiple LISTENs and UNLISTENs
etc The EF is close channel 0x0F, the opposite of FF which is open channel
0x0F
- Nick
-----Original Message-----
From: owner-cbm-hackers@cling.gu.se
[mailto:owner-cbm-hackers@cling.gu.se]On Behalf Of Jim Brain
Sent: Friday, 21 May 2004 1:21 PM
To: CBM Hackers
Subject: IEC codes
Two questions:
Does anyone have additional information on the TALK ATN turnaround part
of the IEC protocol? The PRG doesn;t really explain it to me (it looks
like it must occur after a cmd byte, but is it always TALK? Can it be
TKSA?)
As for codes, I see
x24 to x32 is LISTEN
x44 to x52 is TALK
x5F is UNTALK
x3F is UNLISTEN
xFX is SECOND (LISTEN)
Not sure what TKSA is (04 - 12?) Anyone know?
When I do open15,8,15,"i":close 15
I get:
c28 cFF d49 c3F c28 cEF c3F
I understand the TALK 8, SECOND 15 'I', and the followup TALK 8, but
what is EF? The 3F I get, but does EF mean END or something?
Jim
--
Jim Brain, Brain Innovations
brain@jbrain.com http://www.jbrain.com
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times!
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