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Additional Pictures 

 

 The printed circuit board (PCB) of the PC-100A. The main electronics is centered around the TMC0251 single-chip microcomputer.
Please notice the two additional TMC0561 and TMC0569 ROM in the small 8-pin packages to support the SR-52 resp. SR-56.

 The printed circuit board (PCB) of the PC-100C. The main electronics is centered around the TMC0251 single-chip microcomputer.
The two additional TMC0561 and TMC0569 ROM to support the SR-52 resp. SR-56 are obviously missing.


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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, June 3, 2009. No reprints without written permission.