On Saturday, December 18, 2021 at 2:31:06 PM UTC-5, IBMMuseum wrote:
As documented by John Elliott at http://www.seasip.info/VintagePC/5271.html
And of course John Elliott did a very nice job with the overview. Speaking as someone who used the 3720 PC, 3270 AT, 3270 PC/G, 3270 AT/G, 3720 PC/GX and 3270 AT/GX, in my opinion only the 3270 AT/GX with the 5379-C01 display is truly "interesting".
The 5378 box is slightly smaller than a 5150/5160 case and about as heavy, the cable between the AT/GX display adapter and the 5378 was almost as big as the 5161 expansion connection cable (might be the same cable, I forget). The 5379-C01 was a Sony
Trinitron, very nice for its day and quite heavy. The 3720 AT/GX Graphics Control Program software set was pretty large (5 diskettes, if my fuzzy memory is firing properly today), the other 3270 PC or AT models had more modest software needs. Using GCP
with a DOS level higher than 3.30 was... challenging.
The "best" way to use the 3270 AT/GX hardware (in my view) was to run MYTE (the IBM internal Migratable Yorktown Terminal Emulator) in the 80x50 (columns/lines) text mode, use one (or more) 3270-B ISA coax adapters (MYTE supported up to four, I think)
and/or a ISA 16/4 Token-Ring adapter for additional terminal sessions. I generally ran 8 terminal sessions on my machine back in the late 80s/early 90s in the Glendale Lab, as I was productive as all get-out. My eventual move to a 8580 running OS/2 and
a 8514/A video adapter was a big step backward from a productivity view.
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