30 Jan
2023
30 Jan
'23
9:59 p.m.
Paul Berger wrote:
On 2023-01-29 12:25 a.m., Chuck Guzis via cctalk
wrote:
The IBM Model B electric typewriter was used as a printer and keyboard entry device on at
least the Bendix G-15 (mid 1950s) and the IBM 1620 Model 1 (1959). On the G-15 it ran at
about 8cps (timing was determined by the drum rotation). On the 1620-1 it ran at 10cps.
And yeah, they probably took quite a beating, since many sites did not have a line
printer.
The 1620 Model 2 (1962) used a Model 731 Selectric and drove it at 15.5cps.
Paul K
On 1/28/23 20:20, Paul Berger via cctalk
wrote:
[snip]
believe it is the same
as the 029. The printer in the 1052 is a keyboardless Selectric with no
tab rack and they spaced via a cam on the OP shaft instead of taking a
cycle. The ones I saw on a couple 360s (22 and 25) the space cam was so
worn it wobbled when it took a cycle, but the customer would never let
us do anything with it as long as it worked because they could not do
anything with out the console. Was the 1052 more or less durable than the model B
adapted for the 1620?
With its movable carriage, it always seemed to be in danger of
self-destructing--the thing would shake a bit then a carriage return was
executed.
--Chuck
My experience is that they where pretty durable, I never saw a lot of
1052s by
the time I started in 1979 there was not a lot of 360s in our
branch. [snip]
I don't know how they would compare to a model B that was used as an I/O
I never saw any systems that used one. I would imagine that moving the
heavy carriage back on something that is printing steady would be a
trouble spot. I would image that kind of use would also be hard on the
power roll that drives the type hammers into the paper. I don't image
they would be very fast, a Selectric could print at 15.5 characters per
second and at that speed the cycle clutch never latched it was just one
continuous cycle. Selectric I/Os that ran at full 15.5 chars/sec
suffered way more problems than ones that printed at a lower speed.