The first generation of the L Series included the L2000, L3000, L4000 and
L5000. The L2000 and L3000 had 15 inch wide platens (the hard rubber device that
roll paper was carried on for printing with a print ball similar to an IBM
Selectric typewriter), while the L4000 and L5000 models had 26 inch wide
platens. The L5000 series also used a magnetic strip read/write head which
allowed it to store data on individual ledger cards. All these models used a
mechanical keyboard and paper tape reader that was used to load programs into
memory and/or onto the small hard disc drive. Separate paper tape punches and
readers could be used to store and retrieve accounting data.

The second generation was called the L6000 series and had equivalent models of
6200, 6300, 6400 and 6500. This series used an electronic keyboard (using
individual keyswitches) and an optical paper tape reader.

The third and final generation was the L9000 series with equivalent model
numbers of 9200, 9300, 9400 and 9500. This series used a dot-matrix print head
instead of a print ball.

Machines that had the capability of connecting to a modem and being used as a
terminal as well as a stand alone machine were called TC (Terminal Computer.)
The TC500 was an built on a horizontal platform much like an office desk. The
TC700 model was built on a vertical platform and was used by tellers at banks
and savings and loan institutions.