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Texas Instruments PC-100A 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
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
Memories:      
Program steps:   Courtesy of:  Joerg Woerner
Download leaflet:   (US: 2.3 MByte) Download manual: (US: 3.3 MByte)

The PC-100A printing 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).PC-100A_1.jpg (53058 Byte) 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 cradle also had some more features than just the printer. It functions as a power-adapter and also has a storage/charging compartment where you can charge the battery pack. The calculator (and batterypack compartment) is locked solidly to the 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 a TMC0251 single-chip micro-computer and two additional TMC0561 and TMC0569 ROM to support the SR-52 resp SR-56 calculators.

Don't miss the SR-60 using similiar 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-51's but never could get the trace mode to work, getting a "1" and a "?" on the printout.
The SR-51-II cannot be connected to the PC-100A because of a redesign of the battery compartment.
Although the SR-50A has a print cradle connector similar to the SR-51, and fits on the printer, apparantly it was 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.

Printer paper:

The thermal paper used with this printer (TP-30250 2-1/2" wide and 14 Feet length) was discontinued long time ago. In 2008 Appleton (Appleton, WI) manufactured with the Alpha 800-2.4 paper still a compatible paper.

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@datamath.org.

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