Canon Palmtronic LD-8Rs a.k.a. Palmtronic 8Rs

Date of introduction:  October 1976 Display technology:  Fluorescent
New price:   Display size:  8
Size:  4.6" x 2.7" x 0.55"  
Weight:  2.5 ounces Serial No:  522554
Batteries:  2*AAA or NiCd Pack-4 Date of manufacture:  year 1976
AC-Adapter:  AD-2 Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  TMS1042
Program steps:   Courtesy of:  Joerg Woerner

The Canon Palmtronic 8Rs, also known as LD-8Rs, followed the LD-84 and uses a much smaller housing similar to the LC-8M with a yellow LC-Display.

The engineers at Canon used some tricks to achieve an overall thickness of only 0.55". The calculator chip, a TMS1042 based on the TMS1000 Microcomputer family, is soldered with bended pins on the printed circuit board and the green VF-Display uses straight pins. 

Interesting to know that even the Palmtronic 8s and Palmtronic 8Ms make use of the the TMS1042 calculator chip, despite their different specifications: 

 Feature LD-8s LD-8Ms LD-8Rs
No. of Keys 20 24 20
Memory n.a. [M+], [M-]
[RM}, [CM]
Square root yes yes n.a.

If you have additions to the above article please email:

Joerg Woerner, November 16, 2008. No reprints without written permission.