DATAMATH CALCULATOR MUSEUM |
Additional Pictures
This SR-51 (Second Design) was manufactured
in May 1975 by |
The battery
compartment of the SR-51 gives access to the electrical contacts used to connect the PC-100 printer cradle. |
The Main printed circuit
board (PCB) of the 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. |
The Display and Keyboard
PCB of the SR-51 with two Texas Instruments SN27882 display drivers and fourteen 7-segment LED-Displays. |
Close-up
view of the TMC0501 Arithmetic Chip.
|
Close-up
view of the TMC0522/TMC0523 Scanning and Read-Only Memory Chips.
|
Close-up view of the SN74LS74 Chip from the Clock Generator. |
Close-up view of the SN74LS02 Chip from the Clock Generator. |
Close-up
view of one of the two SN27882 Display Driver Chips.
|
Close-up of the 14-digit LED Display with magnifying
lens. |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, January 21, 2024. No reprints without written permission.