DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Additional Pictures
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This SR-51 Prototype was manufactured in November 1974 by Texas Instruments.
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| 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.
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| The Display and Keyboard
PCB of the SR-51 Prototype with two TI SN27882 display drivers and fourteen 7-segment LED-Displays.
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| The PCB of
this SR-51 Clear-Case Prototype reveals production codes of week 44 year 1974 on the SCOM chip holding the firmware.
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If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, November 18, 2018. No reprints without written permission.
