Monroe made several type of programmable calculators
most of them were
Based on the Compucorp HTL-chipset (a very sophistycated bit-slice design),
memory is mostly static ram i2102.
? Several types are displayed the oldcalculator
website from Rick Bensene.
The 1700-series Monroe/Compucorp calculators is one that I don't have a lot of
information about, but I know that they did use a very sophisticated microprocessor-like
(not bit-slice) architecture, based on the later ACL chipset, which was an improvement
over the earlier HTL chipset.
The machines used IC-ROM-based microcode, and dynamic RAM (not static like the 2102) for
main memory. The microcode determined the various functions available in the machine.
Programmable and non-programmable models were available. Functionality depended on the
ROM board which contained the microcode, the keyboard, and whether or not the machine
contained expanded RAM.
The Compucorp-designed machines of this timeframe were very advanced, and had it not been
for Hewlett Packard coming out with even more advanced (albeit larger) calculators like
the 9810, 9820-series, and the 9830, then later the handheld units like the HP-35, 45, and
65, Compucorp had, for a time, a good share of the high-end calculator marketplace along
with HP's earlier machines (9100A, 9100B), and Wang's calculators.
For the story of Compucorp and its machines, see my website essay at
The Old Calculator Museum