Figure 3 Summary of USPS Equipment Upgrades
Multi-position Letter Sorting Machine (MPLSM)
Engineering Data Isolation Technique (EDIT) - An electronic modification to the ZMT which allowed keyed data to be monitored for accuracy.
Automatic Density Analysis Profile Technique (ADPT) -- An Upgrade that enabled automatic tabulation of MPLSM sweepside BIN densities.
Electronic Sort Processor (ESP) - A modification to MPLSMs which replaced mechanical code setting with electronic code setting to provide more accuracy, reduce maintenance costs, and reduce noise.
Micro-Key - An upgrade to the ZMT which allowed the first digit of a carrier route number to be locked in each time an operator keyed an incoming secondary distribution.
1981 - 1982 -
ZIP Data Logger (ZDL)
Electronic ZIP Retrofit (EZR)-- A modification to MPLSMs to allow four digit keying of ZIP+4 Codes.
ZIP Mail Translator
(ZMT) - Converted MPLSMs from simultaneous
keying (cordal) to sequential then could be translated by
ZIP Codes keyed by
ZMT into BIN
Micro Mark - A modification to Mark II Facer Cancelers to upgrade the electronics to Solid State circuitry.
Single Position Letter Sorting Machine (SPLSM)
Automated Business Mail Processing System (ABMPS) - A modification to the Universal Business Machine (UBM) SPLSM to allow automated distribution of destinating Bar Coded Business Mail.
Flat Sorting Machine (FSM 775)
Software Modification - An upgrade to provide Micro key capability on the FSM 775.
United States Postal Service