DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Royal LCB 830
| Date of introduction: | 1983 | Display technology: | LCD |
| New price: | $22.95 (SRP September 1983) | Display size: | 8 |
| Size: | 2.6" x 6.0" x
0.25" 65 x 153 x 6 mm3 |
||
| Weight: | 2.9 ounces, 81 grams | Serial No: | |
| Batteries: | LR54 | Date of manufacture: | mth 05 year 1983 |
| AC-Adapter: | Origin of manufacture: | Taiwan | |
| Precision: | 8 | Integrated circuits: | NEC uPD1832G |
| Memories: | 3 | ||
| Program steps: | Courtesy of: | Joerg Woerner | |
| 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:
| • 1980:
Royal
LCB 841, 3 Memories • 1983: This Royal LCB 830, 1 Memory, Wallet • 1983: 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 830 Checkbook Calculator manufactured in May 1983 in Taiwan reveals a
clean design centered around a NEC uPD1832G 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 uPD1832G a
variation of the original uPD1833G design sporting just on memory. We located
this calculator chip in a "regular" calculator, too. Don't miss the
Toshiba LC-827 manufactured already in 1980.
Inspecting the PCB of the LCB 830 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 830 manufactured in
May 1983 a small mark reading
830-10,
most likely a reference to Type 830 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 830 sporting a 830-10 mark and a LCB 835
with a 830A-10 mark
manufactured a few month later, reveals some interesting differences:
PCB Mark |
Rev. |
Calculator Chip |
Date Code |
PCB Jumper |
PCB Technology |
| 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.
This
Royal LCB 830 and its twin LCB 835 are obviously based on an OEM design shared with other manufacturers. Compare the Aurora
CB-900.
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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, February 27, 2020. No reprints without written permission.