DATAMATH CALCULATOR MUSEUM
compartment of the SR-51 gives access to the electrical
contacts used to connect the PC-100 printer cradle.
sizes found on an early SR-51 (TOP, Serial No.
and a later SR-51 (BOTTOM, Serial No. 0044521).
|The Main printed circuit
board (PCB) of a SR-51
calculator. The brain of the
calculator uses the TMC0501 and a stack of 2 SCOM (TMC0522,523) circuits.
A second PCB holds the keys, display and driver circuits.
printed circuit board PCB of an early SR-51 gives production codes
of week 42 year 1974 on the SCOM chip holding the firmware.
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© Joerg Woerner, July 14, 2002. No reprints without written permission.