The System360 Model 20 Wasn't As Bad As All That 3885
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1403 was from 1401 comptuer and adopted for 360. there were several 1403 models. 3211 printer followed the 1403 ... before the 3800 came along in the mid-70s. part of the issue was that datacenters sometimes only loaded TN train for special print jobs ... since the non-lower-case chain would print much faster (i.e. the characters were repeated more often ... so the latency for specific character slug to come under hammer was less).
following from old posting mentioning 3800
My first student job was to port a 1401 MPIO program to 360-30. MPIO did the unit record (cards) to tape and tape to unit...
note that this was much more "personal" laser printer. from the mid-70s, there had been the 3800 datacenter laser printer ... which had paper feed rates measured in feet per second. some datacenters bypbutted the boxed paper feed ... and had huge paper rolls feeding directly into 3800 (4-5 ft in diameter). this shouldn't be confused with the later 3820 laser printer ... which was desktop unit.
minor ref:
from above:
The IBM 3800 laser-electrophotographic printer of 1975 had a speed of 20,000 lines a minute in preparing bank statements, premium notices and other high-volume documents. Laser beam paths were altered millions of times a second and were reflected from an 18-sided mirror that spun at 12,000 revolutions per minute. (VV3103)
... snip ...
I think the character set would have been called pica type (12 pt). I never dealt with the ALA until the 90s, but...
some pictures: