DATAMATH CALCULATOR MUSEUM
|Date of introduction:||1983||Display technology:||LCD dot matrix|
|New price:||$279.00 (MSRP 1982)||Display size:||16 characters|
|Size:|| 2.8" x 7.7" x 0.45"
72 x 170 x 11 mm3
|Weight:||4.2 ounces, 120 grams||Serial No:||47028106|
|Batteries:||2*CR2032||Date of manufacture:||mth 07 year 1985|
|AC-Adapter:||Origin of manufacture:||Japan|
|Precision:||12||Integrated circuits:|| CPU: SC61860S
|Memories:||4.2k RAM, 40k ROM|
|Program steps:||Courtesy of:||Ken H. Meine|
Sharp Corporation introduced in June 1980 with the PC-1210 (and its sibling PC-1211) the World's first Pocket Computer with BASIC programmability. It took only about three months and Matsushita defined with their Panasonic HHC a new category of Hand-held Computers or Portable Computers. Casio, having a long history of Programmable Pocket Calculators, entered the arena in November 1981 with their FX-702P, combining a scientific calculator with BASIC programmability in the new "landscape" form factor with wide LC-Displays and an alphanumeric keyboard.
With the three cornerstones of the emerging market defined, Sharp consequently split their portfolio into two different directions:
|• PC-1500 (1982): Portable Computer as a center of a
Computer System with many peripherals
• PC-1401 (1983): Hybrid of a Pocket Computer with BASIC
Programmability and a Scientific Calculator
While Casio labeled the FX-702P only as a "Programmable Calculator", chose Sharp with their combination of a scientific calculator and BASIC programmability a different approach and sold the same product under different names. We know five different pairings:
|PC-1401||EL-5500 II||Scientific calculator, 4k Bytes RAM, 16 character display|
|PC-1402||Scientific calculator, 10k Bytes RAM, 16 character display|
|PC-1403||Scientific calculator, 8k Bytes RAM, 24 character display|
|PC-1403H||EL-5500 III||Scientific calculator, 32k Bytes RAM, 24 character display|
|PC-1421||EL-5510||Financial calculator, 4k Bytes RAM, 16 character display|
|PC-1430||Scientific calculator, 2k Bytes RAM, 16 character display|
|PC-1431||EL-5400||Scientific calculator, 4k Bytes RAM, 16 character display|
|PC-1450||Scientific calculator, RAM Card, 16 character display|
|PC-1460||EL-5520||Scientific calculator, RAM Card, 24 character display|
The PC-1401 series of Pocket Computers features an 11-pin connector for peripherals on its left side:
|CE-126P||Thermal Printer & Cassette Interface,
up to 24 characters per line
Dismantling a Sharp PC-1401 manufactured in July 1985 by Sharp
Corporation in Japan reveals a efficient design centered
around a Sharp SC61860 8-bit microcontroller.
The printed circuit board (PCB of the Sharp PC-1401 hosts a total five Integrated Circuits (ICs):
|• SC61860: 8-bit microcontroller with 8k Bytes ROM manufactured by Sharp
in a CMOS process and using a 80-pin QFP (Quad Flat Pack) package
• SC613256: 32k Bytes ROM manufactured by Sharp in a CMOS process and using a 54-pin or 44-pin QFP (Quad Flat Pack) package
• 2*HM6116 or HM6264: 2k Bytes manufactured by Hitachi in a CMOS process and using an 24-pin SOP (Small Outline Package) encapsulation
• SC43536: Display driver with built in RAM (128*4 Bits), manufactured by Sharp in a CMOS process and using a 62-pin QFP (Quad Flat Pack) package
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© Joerg Woerner, January 23, 2021. No reprints without written permission.