DATAMATH CALCULATOR MUSEUM
With the TMC05xx building blocks Texas Instruments created a novel architecture for scalable scientific calculators. The architecture uses minimum a 2 chip design with the Arithmetic chip TMC0501E and the SCOM (scanning read only memory) but was expandable to a maximum of 8 SCOM's, additional RAM as program memory for programmable calculators, additional RAM for general purpose registers and even a chip driving a printer or a magnetic card reader.
The TMC0594 MAGNETIC I/O chip provides the interface between the four-track magnetic card read/writer and the TMC0501E.
|PHI1, PHI2||225||230||kHz||Opposite phases|
The TMC0594 uses a
standard DIP-22 package.
|1||O||Write Track 2||22||O||Write Track 3|
|2||I||Read Track 2||21||I||Read Track 3|
|3||O||Write Track 1||20||O||Write Track 4|
|4||I||Read Track 1||19||I||Read Track 4|
|5||V||Common Voltage||18||V||Motor Voltage|
|6||O||Instruction words||17||V||Common Voltage|
|7||I||Calculating status||16||I||External access|
|8||O||Keyboard emulation||15||I||Clock Input 2|
|9||O||Motor on/off||14||I||Clock Input 1|
|10||I||Card position switch||13||V||Negative Voltage VDD|
|11||I||not connected||12||V||Negative Voltage VGG|
Comments: The purpose of the KR line to the TMC0501E is not clear. It seems to be used with the Card sense switches.
If you have additions to the above datasheet please email: firstname.lastname@example.org.
© Joerg Woerner, February 02, 2001. No reprints
without written permission.