Texas Instruments CC 40 Compact Computer

Date of introduction:  March 1983 Display technology:  LCD dot matrix
New price:   Display size:  31 (10 + 3)
Size:  5.8" x 9.3" x 1.0"
 148 x 236 x 25 mm3
Weight:  19.8 ounces, 560 grams Serial No:  4734905
Batteries:  4*AA Date of manufacture:  wk 28 year 1983
AC-Adapter:  AC9201, AC9201/E Origin of manufacture:  USA (ATA)
Precision:  13/14 Integrated circuits:  CPU: TMC70C20
 ASIC: AMI 1041036
 ROM: HN61256
 RAM: 3*HM6116LP
Memories:  18kB RAM, 34kB ROM    
Program steps:   Courtesy of:  Anders Persson
    Download manual:   (US: 2.0 MByte)

With the CC 40 Texas Instruments introduced in the year 1983 a powerful and yet portable computer. Within 3 years the CC 40 was replaced with the TI-74 BASICALC.

The CC 40 uses the HEX-BUS for expansion, different products like printers, plotters and even a serial interface were available:




SS-1000 Memory Expansion 16k RAM
SS-2000 Memory Expansion with Li-Backup Battery 8k RAM
HX-1000 Plotter 4 colors  
HX-1010 Printer (Thermal ribbon)  
HX-3000 RS-232 Interface  
HX-3100 Modem  
HX-3200 Centronics Printer Interface  
SS-1001 Pascal module  
SS-3004 Memo Processor module  
SS-3006 Finance module  
SS-3007 Electrical Engineering module  
SS-3008 Statistics module  
SS-3009 Mathematics module  
SS-3024 Games module  

Dismantling the featured CC 40 COMPACT COMPUTER manufactured in July 1983 reveals a neat design with just one printed circuit boards (PCB). It makes use of just four different main components:

CPU (Central processing Unit): The Texas Instruments TMC70C20 microcontroller is a member of the TMS7000 family manufactured in CMOS technology. The original design of the TMS7000 series was introduced in 1981 as an 8-bit extension of the TMS1000 Familiy to compete with the Intel i8051, Motorola M6801, and Zilog Z8 parts. The first chips sported 128 bytes of on-chip RAM (Random Access Memory) and either 2k Bytes or 4k Bytes of ROM (Read Only Memory). The featured CC 40 sports with the TMX70C20 a very early prototyp of the TMC70C20, both equipped with 2k Byes of ROM.

ROM (Read Only Memory): The ROM contains the operating system of the calculator or computer. The first products on the market used mask-programmable ROM, the program was strored already during the production of the Integrated Circuit. Later calculators changed to Flash ROM, a technology allowing the programming of the software during the final production stage of the calculator. With the TI-83 Plus and all later graphing calculators from Texas Instruments even the user was able to reprogram the operating system.

The HN61256 ROM of this CC 40 COMPACT COMPUTER was manufactured by Hitachi and offers a capacity of 32k Bytes for the BASIC interpreter.

(Random Access Memory): The RAM is used as data memory and is used to store both variables, user programs and intermediate results. This CC 40 COMPACT COMPUTER makes use of three HM6116 manufactured by Hitachi, Japan
. The total capacity of the memory is 6k Bytes using three HP6116 chips, later versions of the CC 40 featured 18k Bytes of memory using one HM6116 and two HM6264 (8k Bytes) chips.

: The CC 40 COMPACT COMPUTER uses an AMI 1041036 application-specific integrated circuit (ASIC), its function is not yet discovered.

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If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.