Because it is covered with epoxy the EPROM data cannot be erased.
(Although EPROMs start at all
′
ones
′,
so if the fiscal seal is breached any
′
one
′
bits could be programmed to
′
zero
′
even in previously
recorded data.)
The IBM fiscal printer can store 3840 days of data at 64 bytes of data per day.
The IBM fiscal printer provides electronic readout of the fiscal data (if allowed by law) to allow a tax
inspector to readout the data electronically, possibly from the store controller/server, as opposed to having to
printout the data from each cash register on the register tape.
1.2.4 Fiscal Memory - A5 pattern
The fiscal microcode writes the pattern
″
A5
″
in address 82 (hexa) in the fiscal memory to be able to detect
the eprom connection.
It is read for all fiscal commands. If it isn
′
t found, the fiscal microcode returns the error code 109.
1.2.5 Fiscal Label
The fiscal label is attached to the base of the fiscal printer and contains the same serial number that is
electronically written in the fiscal memory.
Since the label is part of the same field replaceable unit as the fiscal base with epoxied fiscal memory there is
no danger of having a serial number mismatch.
In accordance with many of the fiscal laws, the integrated mounting hardware for the IBM 469X POS
terminals has been modified to allow visibility of the fiscal label and fiscal seal to a person walking around
the POS terminal without requiring any disassembly.
Fiscal Hardware Technical Specification — Page 17 of 183
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