DATAMATH

DATAMATH CALCULATOR MUSEUM

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
Memories:
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]	[RM/CM]
Square root	yes	yes	n.a.

If you have additions to the above article please email: joerg@datamath.org.