27 Sep
2020
27 Sep
'20
8:12 p.m.
On Sun, Sep 27, 2020, 8:12 PM Richard Cini via cctalk <cctalk at classiccmp.org>
wrote:
Great point. Does a VT100 have a pass-through serial
port?
It's how printers were connected...
Warner
Maybe the development machine was connected to a pass through serial port
on a terminal and then sent command to the DEC-20 to
send the files. So
there would have been some sort of connection from the DEC-20 to IBM.
Leased line? Packet switched?
A great puzzle.
http://www.classiccmp.org/cini
Long Island S100 User?s Group
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________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Dennis Boone
via cctalk <cctalk at classiccmp.org>
Sent: Sunday, September 27, 2020 10:03:23 PM
To: cctalk at classiccmp.org <cctalk at classiccmp.org>
Subject: Re: SCP/Microsoft 20HAL uploader
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?
That part's a puzzler. Perhaps the link was from the PC to the MS
DEC-10 and thence out to IBM?
De