DATAMATH CALCULATOR MUSEUM |
Additional Pictures
The battery
compartment of the SR-51 gives access to the electrical contacts used to connect the PC-100 printer cradle. |
Different font
sizes found on an early SR-51 (TOP, Serial No.
0001589) 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 keyboard
contacts, display and driver circuits. |
The
printed circuit board PCB of an early SR-51 reveals production codes of week 42 year 1974 on the SCOM chip holding the firmware. |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, July 14, 2002. No reprints without written permission.