DATAMATH CALCULATOR MUSEUM
Royal LCB 835
|Date of introduction:||1983||Display technology:||LCD|
|New price:||$22.95 (SRP September 1983)||Display size:||8|
|Size:|| 2.6" x 6.0" x
65 x 153 x 6 mm3
|Weight:||2.9 ounces, 81 grams||Serial No:|
|Batteries:||LR54||Date of manufacture:||mth 07 year 1983|
|AC-Adapter:||Origin of manufacture:||Taiwan|
|Precision:||8||Integrated circuits:||NEC uPD1831G|
|Program steps:||Courtesy of:||Ken H. Meine|
|Download manual:||(US: 1.7 MByte)|
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: This Royal LCB 835, 1 Memory, Purse
• 1986: Royal CBC 80NT, Solar cells, Taiwan, 3 Memories
• 1987: 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
Dismantling the featured LCB 835 Checkbook Calculator manufactured in July 1983 in Taiwan reveals a clean design centered around a NEC uPD1831G single-chip calculator circuit soldered on a one-sided printed circuit board (PCB) and powered by two small LR54 (LR1130) batteries. NEC introduced with the uPD1831G a variation of the original uPD1833G design sporting just on memory. We located this calculator chip in "regular" calculators, too. Don't miss the TI-1744 and learn about the full feature set of the uPD1831G with the Canon card F-32 Mathematic Calculator.
Inspecting the PCB of the LCB 835 calculator brought our attention to a small jumper to select between:
|• (MR) Checkbook Calculator: [BAL/MR] doesn't clear the Memory
• (MRC) Standard Calculator: [MRC] does clear the Memory
In addition did we notice on the PCB of this LCB 835 manufactured in July 1983 a small mark reading 830A-10, most likely a reference to Type 830, Alternate design 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.
Comparing this LCB 835 sporting a 830A-10 mark and a LCB 830 with a 830-10 mark manufactured a few month earlier, reveals some interesting differences:
|830||10||NEC uPD1832G||8316||(MR), (MRC), (N)||single-sided, wire jumpers in 3 different length|
|830A||10||NEC uPD1831G||8327||(MR), (MRC), 4*(A)||single-sided, conductive print over PCB traces|
The NSC Novus Electronics NS 101A (First Design) and NS 101A (Second Design) went through the same changes in PCB technology.
Royal LCB 835 and its twin LCB 830 are obviously based on an OEM design shared with other manufacturers. Compare the Aurora
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. Interested in Purse Calculators? Don't miss the Arizona CB82 Check Tronic.
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© Joerg Woerner, February 5, 2020. No reprints without written permission.