One more interesting tidbit. On startup, the program sends ETX,ETX,"PJ",0dh to
the serial channel. Does this seem DEC-like? I'm wondering if the development
machine was connected to a pass-through serial port on a terminal (VT-100??)
which sat on the DECSYSTEM-20.
On 9/27/20, 8:30 PM, "cctalk on behalf of Richard Cini via cctalk"
<cctalk-boun...@classiccmp.org on behalf of cctalk@classiccmp.org> wrote:
Excellent! That’s a great piece of info. Not sure why a TOPS-10 command
would be embedded in a program like this. The notion of filtering/delay itself
makes sense but that command would make sense only if IBM had a DECSYSYEM too,
no?
http://www.classiccmp.org/cini
Long Island S100 User’s Group
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________________________________
From: cctalk <cctalk-boun...@classiccmp.org> on behalf of Dennis Boone via
cctalk <cctalk@classiccmp.org>
Sent: Sunday, September 27, 2020 8:22:00 PM
To: cctalk@classiccmp.org <cctalk@classiccmp.org>
Subject: Re: SCP/Microsoft 20HAL uploader
> Partially related to that is a program called “20HAL” which was a
> code uploader Microsoft used in the late stages to get code from
> Microsoft in Bellevue to IBM in Boca Raton, FL.
The TOPS-10 manual says that:
(SET) TTY FILL n
sets delay characteristics for the line to class `n`. There's a table
of the number of filler characters sent after each of a number of
different control characters. Class 3 uses the most fillters. The
filler characters used are CR after a CR, and DEL after all the others.
It could make sense to do this during a file transfer, depending on the
assorted endpoints, etc.
De
