There's also a scan of GA27-2749-5 "IBM 3270 Information Display System
Component Description" (Nov. 1975) at bitsavers.org.
Bob
Alan Altmark wrote:
The 3278-1 had a primary screen size of 12x40 (480 bytes) and an alternate
screen size of 12x80 (960 bytes).
I am shocked that no one bothered looking in their handy 3276 Description
and Programmer's Guide, GA18-2081. :-)
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