DATAMATH CALCULATOR MUSEUM
Royal CBC 70 Checkbook Calculator
|Date of introduction:||May 1987||Display technology:||LCD|
|New price:||$11.95 (SRP May 1987)||Display size:||8|
|Size:|| 2.8" x 6.1" x
70 x 154 x 7 mm3
|Weight:||2.5 ounces, 72 grams||Serial No:|
|Batteries:||LR54||Date of manufacture:||mth 11 year 1988|
|AC-Adapter:||Origin of manufacture:||Taiwan|
|Precision:||8||Integrated circuits:||Sharp LI3330MT|
|Program steps:||Courtesy of:||Ken H. Meine|
Royal Typewriters and its sister company Triumph-Adler, part of Litton Industries, were sold in 1986 to Olivetti and is since September 2004 a private American company again and is today known as Royal Consumer Information Products Inc.
Royal entered the market of Checkbook Calculators with the LCB 841 in August 1980. It features Account Manager functionality with three permanent (till you remove the batteries) Memories and started a very successful product line. We discovered as of now eleven different family members:
LCB 841, 3 Memories
• 1983: Royal LCB 830, 1 Memory, Wallet
• 1983: Royal LCB 835, 1 Memory, Purse
• 1986: Royal CBC 80NT, Solar cells, Taiwan, 3 Memories
• 1987: This Royal CBC 70, Taiwan, 1 Memory
• 1988: Royal CBC 80, Solar cells, Thailand, 3 Memories, US market
• 1988: Royal/Olivetti CBC 80, Solar cells, Thailand, 3 Memories, Canadian market
• 1988: Olivetti DII, Solar cells, Thailand, 3 Memories, European market
• 1989: Royal CBC 70, Thailand, 1 Memory
• 1993: Royal CBC 95, Solar cells, Thailand, 3 Memories
• 1998: Royal CBC 2000, Solar cells, China, 3 Memories
the featured CBC 70 Checkbook Calculator manufactured in November 1988 in Taiwan reveals a
clean design centered around a Sharp LI3330MT single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by two small LR54 (LR1130) batteries.
Inspecting the PCB of this CBC 70 manufactured in November 1988 brought our attention to a small mark reading 307-10, most likely a reference to Type 307 and Revision 1.0 of the design (schematics and layout).
Please find an overview of the
PCB-Marks we discovered
so far on Account Manager calculators.
Learn more about single-chip calculator circuits used in Account Manager Calculators.
Don't miss the Corvus CheckMaster introduced by Mostek already in 1975. This rare product retains the balance of your memory even when shut off but uses power-hungry electronics.
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© Joerg Woerner, February 27, 2020. No reprints without written permission.