PR-40 Alphanumeric Printer
Been looking for a reasonably priced printer? The SWTPC PR-40 may be just
what you have been wanting. It is a 5 x 7 dot matrix impact printer similar in
operation to the well known Centronics printers. It prints the 64 character
upper case ASCII set with 40 characters/line at a rate of 75 lines/minute on
standard 3 7/8” wide rolls of adding machine paper. One complete line is
printed at a time from an internal forty character line buffer memory. Printing
takes place either on receipt of a carriage return or automatically whenever
the line buffer memory is filled.
The printer can accept character data as fast as one character per
micro-second or as slow as you wish to send it. The printer’s seven parallel
data lines are TTL compatible and may be enabled by a single “data ready”
control line or by separate “data ready” and “data accepted” handshake
control lines. This universal approach makes the printer compatible with all
computer and terminal systems having an eight bit parallel interface; including
of course the SWTPC 6800 computer and most “8080” based designs.
The printer mechanism is mounted on a black anodized aluminum chassis which
houses the electronic circuits and the 115/230 Volt AC 50-60 Hz power supply for
the unit. This makes the printer’s overall dimentions 9 5/8” wide x 10
1/2” deep x 8 3/4” high.
Each unit is shipped with one ribbon and one roll of paper. Extra ribbons are
available from us while the standard adding machine paper may be purchased in
office supply stores.
Note: The spelling of "dimentions" is original. I doubt most modern PC users understand how primitive the first "personal" printers really were. Well, this is a good example. Randy
When PCs Were Micros - Bits and pieces of history about the "good" old days