[GreenKeys] [External] Kleinschmidt 7302 ?

[Jones, Douglas W]

From: David I. Emery [die at dieconsulting.com] -- Friday, July 29, 2022 5:53 PM

On Fri, Jul 29, 2022 at 08:47:56PM +0000, Jones, Douglas W wrote:
>         As someone around computers back then (70s) I'd say in my
> experience it was considerably more than half of the really seriously
> high speed high volume LPRs.   These were not table top units... more
> things the size of a Cooper Mini  ...

They weren't that big, but I really do like using the Mini as a unit of volume for comparison purposes.  The drum printer that left me (50 years later) with minor hearing loss was about the size of the slant-front desk I'm sitting at right now.  That one was from DEC, attached to a PDP-11.

>         I was aware of IBM chain printing, but actually used and even owned
medium size Data Products drum printers and one or two larger ones at
work... and I'm not particularly aware they ever made chain printers
then (or maybe later) 

I think Data Products made the printer we got for our Modcomp IV super-mini computer back in 1974 at the U of Illinois.  It was a chain printer, and we went out of our way to get a printer that handled the full 96 characters of ASCII, Upper and Lower case.  My only print sample for that printer is my MS thesis:
-- http://homepage.cs.uiowa.edu/~dwjones/plato/JonesMS.pdf

I had to overprint each line 5 times (using a new ribbon) to get print quality high enough to submit as a thesis.  Unlike drum printers, this one never had jitter problems (they'd be horizontal jitter on a chain printer, not vertical like a drum printer).  We used the printer fairly regularly for 6 years before I left the U of Illinois Medical Computing Lab.  This printer was also about the size of the desk I'm now sitting at.

           Doug Jones
           jones at cs.uiowa.edu