Canon Canola L1632

Date of introduction:  1977 Display technology:  Fluorescent
New price:   Display size:  16
Size:  11.4" x 10.2" x 3.8"     
Weight:  4 pounds 9 ounces Serial No:  301561
Batteries:  n.a. Date of manufacture:  year 1977
AC-Adapter:  220V Origin of manufacture:  Japan
Precision:  16  Integrated circuits:  TMS1370/ZA0543 
Memories:  3    
Program steps:   Courtesy of:  Joerg Woerner

At a first glance the Canon Canola L1632 looks very common. We know the housing from the Canola F-11 statistical desktop calculator introduced already in 1975. 
L-1632_DSP.jpg (66011 Byte)A first calculation (the common square-root of 8) reveals a display with 16-digits of precision. 

L-1632_KBD.jpg (42185 Byte)A deeper study of the keyboard gives 3 full memories ! Now we should think about this calculator. All known calculator architectures manufactured by Texas Instruments control a maximum of 12 digits (Canola L121F with
TMS0201, TMS0302).

L-1632_PCB.jpg (278227 Byte)Dismantling the Canola L1632 is a simple but surprising job: A small single-chip microcomputer on a huge printed circuit board (PCB) surrounded by dozens of discrete components.

L-1632_IC.jpg (27718 Byte)The single-chip microcomputer was manufactured by Texas Instruments and gives only two numbers:

ZA0543: This is the ROM-code used with TMS1000 microcomputer family
KAP7706: The four digits define the week and year of manufacturing.

Texas Instruments released between 1974 and 1978 about 10 different TMS1000 members. With only four pieces of information we are able to trace down to the exact type:

16-digit display capacity, 40-pin housing: TMS12xx, TMS13xx, TMS16xx
Fluorescent display: TMS127x, TMS137x, TMS167x
3 full memories plus about 4 working registers needs more than 112*4 Bits of RAM: TMS130x, TMS160x
Manufactured in 1979: TMS1370

If you have additions to the above article please email:

Joerg Woerner, July 22, 2002. No reprints without written permission.