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DATAMATH CALCULATOR MUSEUM |
Radio Shack statesman EC-455
Date of introduction: | October 1996 | Display technology: | LCD |
New price: | $15.99 (SRP October 1996) | Display size: | 8 |
Size: | 2.8" x 6.1" x
0.25" 70 x 154 x 7 mm3 |
||
Weight: | 2.5 ounces, 72 grams | Serial No: | |
Batteries: | LR54 | Date of manufacture: | mth 04 year 1998 |
AC-Adapter: | Origin of manufacture: | Malaysia | |
Precision: | 8 | Integrated circuits: | Sharp LI3154 |
Memories: | 1 | ||
Program steps: | Courtesy of: | Joerg Woerner |
Radio Shack, acquired by Tandy Corporation in
1963, entered the market of Checkbook Calculators in November with this EC-306. 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 seven (w/o counting Tandy versions) different family members:
• 1982: Radio Shack
EC-306 / 65-696, 3 Memories • 1982: Tandy EC-306 / 65-696, 3 Memories • 1987: Radio Shack EC-308 / 65-996, 3 Memories • 1987: Radio Shack EC-430 / 65-570, 3 Memories, Taiwan • 1988: Radio Shack EC-430 / 65-570A, 3 Memories, Thailand • 1996: Radio Shack EC-455 / 65-569, 1 Memory, TAX • 2000: Radio Shack 65-504, 3 Memories, TAX, violet CC keys • 2002: Radio Shack 65-504A, 3 Memories, TAX, blue CC keys |
Dismantling the featured
Radio Shack statesman EC-455 calculator manufactured in April 1998
in Malaysia reveals a
clean design centered around a Sharp LI3154 single-chip calculator circuit
soldered on a double-sided printed circuit board (PCB) and powered by one LR54
battery and 4 solar cells. Learn how to decipher the
4A8
date code on the pictured
calculator. We located this calculator chip in "regular" calculator, too. Don't
miss the TI-1795+ and
TI-1706SV.
Inspecting the PCB of the EC-455 calculator brought our attention to a small jumper to select between:
• (---) 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 EC-455 manufactured in
April 1998 a small mark reading
0158-0810.
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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 3, 2004 and February 25, 2020. No reprints without written permission.