Texas Instruments PC-100A Printer Cradle

Date of introduction:  1976 Display technology:  
New price:  $199.95 (SRP 1977), 209.00 Display size:  
Size:  10.4" x 11.3" x 4.1" Printer technology:  Thermal TP-30250
Weight:  5 pounds 9 ounces Serial No:  8033070
Batteries:   Date of manufacture:  wk 19 year 1977
AC-Adapter:  120 V or 240 V Origin of manufacture:  Netherland
Precision:   Integrated circuits:  TMC0251, TMC0561, TMC0569, 4*SN96912
Program steps:   Courtesy of:  Joerg Woerner
Download leaflet:   (US: 2.3M Bytes) Download manual: (US: 3.3M Bytes)

PC-100A_1.jpg (53058 Byte)The PC-100A Printer Cradle followed the PC-100 within a few months. It can be used with the SR-52, SR-56, TI-58 and TI-59 (not the TI-57). Its thermal printer has 64 alphabetic, numeric and special characters which can be printed at the rate of 60 characters per second. Up to 20 characters can be printed per line on 2.5 inch wide thermal paper. 

The PC-100A can also be used to print, list or trace program steps as an aid to debugging. 

The PC-100A Printer Cradle in addition offers some extra features: It functions as a power-adapter and also has a storage/charging compartment where you can charge the battery pack. The calculator (and battery pack compartment) is locked solidly to the Printer Cradle with the use of a key. 

PC-100A_PCB.jpg (638906 Byte)Dismantling the PC-100A printing cradle reveals a rather complex printed circuit board (PCB) based on the TMC0250 Printer/Display Chip from the TMS0200 Chipset for 12-digit Desktop Calculators and two additional TMC0561 and TMC0569 BROM (Bare Read Only Memories) Chips to support the SR-52 respectively SR-56 calculators.

Don't miss the SR-60 using similar components.

American Micro Products introduced with the Module Selector a very interesting product fitting into the charging bay of the PC-100A Printer Cradle.

Using the PC-100A with the SR-51/51A

PC-100A_2.jpg (8734 Byte)Although not officially supported by TI, several people were able to use the PC-100A with SR-51 and SR-51A calculators by putting the PC-100A in SR-52 mode. Some people found that the print mode worked fine with their SR-51s but never could get the trace mode to work, getting an "1" and a "?" on the printout. Learn more about Printing with the SR-51 / SR-51A.
The SR-51-II cannot be connected to the PC-100A because of a redesign of the battery compartment.
Although some SR-50A have a Printer Cradle connector similar to the SR-51 and it fits mechanically on the printer, was it apparently not preprogrammed for printout.

The successor of the PC-100A is the PC-100C which lacks the switch that makes it compatible with the SR-52 and SR-56. The PC-100B was only a short time available, it was a mixture of the old and new cradle.

The PC-100A is featured in the Texas Instruments Incorporated bulletins CB-276 and CL-283 dated 1977.

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If you have additions to the above article please email:

Joerg Woerner, January 3, 2002. No reprints without written permission.