----------------------<snip>-------------------------
I just acquired what I believe to be an early 'green card'.
It's actually a white booklet, GX20-1727-5, 20 pages (back cover is page
20).
Title is IBM System/360 Reference Card - System/360 Model 20
I remember hearing/reading some trivia that the original 'green card'
was white.
Looks like the same format as more recent cards.
List of instructions much shorter that the GX20-1703 cards.
Can anyone confirm/deny that this is a predecessor to the more familiar
foldout cards GX20-1703 series?
------------------------<unsnip>--------------------------
The two are roughly concurrent in origin. The 360/20 instruction set
really was much smaller than the higher-model 360 machines. IIRC, the
360/30 was the first that (could) have the full instruction set. IIRC,
the 360/20 didn't appear until mid-1966, as a very small-scale machine
for the 1401 replacement market. Ditto the model 29.
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