Radio Shack EC-4000

Date of introduction:  1978 Display technology:  LED-stick
New price:  $79.95 Display size:  8 + 2
Size:  5.8" x 3.1" x 1.4"
 148 x 78 x 36 mm3
Weight:  6.4 ounces, 180 grams Serial No:  4864178
Batteries:  BP6, BP7 Date of manufacture:  wk 29 year 1979
AC-Adapter:  AC9131, AC9132 Origin of manufacture:  USA (ATA)
Precision:  11 Integrated circuits:  TMC1501
Logic:  AOS - 4 Pending Operations, 9 ()    
Memories:  8    
Program steps:  50 Courtesy of:  Joerg Woerner

EC-4000_BACK.jpg (492142 Byte)The Radio Shack EC-4000 does not only look like an early TI-57 Programmable, it's 100% identical. Please notice that Texas Instruments used in Italy a simple sticker instead the molded TI-logo and TEXAS INSTRUMENTS nameplate found with the US-built TI-57 Programmable.

EC-4000_PCB.jpg (155491 Byte)Dismantling this Radio Shack EC-4000 manufactured in 1979 reveals a well-known printed circuit board (PCB) with the impressive TMC1501 single-chip calculator circuit.

Find a nice collection of program listings for the TI-57 on Laurent's website.

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.