1.2 Fiscal Security Characteristics
The IBM POS fiscal solution is based on the concept of a
′
fiscal printer
′.
Because of the restrictions in most countries relative to the definition of a
′
fiscal machine
′,
a distributed POS
must have the fiscal electronics sealed in the printer.
The printer becomes the
′
fiscal machine
′
in a
distributed POS. This solution prevents fraud by ensuring absolutely that what is printed is recorded in the
fiscal electronics.
In this case the only fiscal dependency remaining on the POS terminal that the printer is attached to is the
ability to sense connection of the POS displays.
Our system provides that capability by having all the POS I/O wired in parallel which allows the fiscal
printer to monitor the serial I/O responses to polls from the configured displays. If a display is disconnected
or stops operating, the fiscal printer will inhibit further printing until the display resumes operation.
1.2.1 Method of Sealing
IBM seals the printer with a single screw covered by a lead plug.
The CE uses an official tool to stamp the authorized fiscal logo into the lead seal when it is inserted into the
opening over the screw.
1.2.2 Fiscal Processing
The IBM fiscal printer has a special electronics board sealed in the fiscal base which intercepts the data from
the POS terminal and processes it before sending it to the printer to be printed. The ensures that nothing is
printed that does not completely comply with the fiscal law requirements and that all data is captured in the
fiscal printer non-volatile memory.
The fiscal processor logic board has 32K bytes of static RAM and a time of day clock module both backed
up by a 10 year lithium battery. A fixed pattern in the memory is checked each time the printer is powered
on as an alternative to having a battery voltage sensor.
For 4610 SureMark RS-485, a DS80C320 microprocessor is used to process the data and perform arithmetic.
For 4610 SureMark USB, a DS80C390 microprocessor is used to process the data and perform arithmetic.
All fiscal data is calculated by the fiscal processor board and any totals sent from the POS terminal are
verified before printing is allowed.
The microprocessor has special internal circuitry which detects power down situations with enough warning
to save all fiscal data in the battery backed up memory.
There is a J4/CE jumper which is used to reset the RAM after a repair or in the event of a temporary data
error in the RAM. The J4/CE jumper can also be used to control some commands so that only the CE can
perform them.
A battery jumper is available on fiscal printer logic card to allow a certification test to verify that the
processor card would detect a low battery condition.
1.2.3 Fiscal Memory
IBM uses a 2 megabit EPROM (electronically programmable read-only memory) sealed in a tub of epoxy
on the base of the fiscal printer for the long term fiscal memory. At the end of each day the daily totals are
written to the fiscal memory. The fiscal processor logic board generates the appropriate voltages and logic to
write data to an EPROM. EPROMs are completely non-volatile and have a life span measured in decades
rather than years.
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