Texas Instruments TI-2500 / Datamath Version 2 (Made in Spain)

Date of introduction:  Refurbished Display technology:  LED modules
New price:  3,190 pts (Oct. 1974) Display size:  8
Size:  5.5" x 3.0" x 1.7"
 139 x 76 x 42 mm3
Weight:  12 ounces Serial No:  AE 47105
Batteries:  4*AA NiCd  Date of manufacture:  wk 04 year 1975
AC-Adapter:  AC9110 Origin of manufacture:  USA
Precision:   Integrated circuits:  TMS0719
Program steps:   Courtesy of:  Philippe Leckler

This Datamath Version 2 alias TI-2500 was manufactured in Spain and refurbished in 1975. Comparing the refurbished model with an original Datamath Version 2 manufactured in Spain revealed some unusual details:

The date code reads: Refurbished in week 04 year 75 or January 1975. TI-2500V2S1_Ref.jpg (11946 Byte)

It should read:
"Vollständige Informationen sind im Handbuch angegeben" instead
"vollständige Informationen sind in der Notiz eingetragen"

TI-2500V2S1_Lab.jpg (18273 Byte)
The printed circuit board (PCB) is the standard 30367H layout used with all Datamath Version 2 calculators. 
But it was refurbished...
TI-2500V2S1_PCB.jpg (74138 Byte)
The single-chip calculator circuit of the refurbished Datamath with an unusual designation: 
TMS0719 instead TMS0119.
TMS0719.jpg (19128 Byte)

Why this odd designation? Texas Instruments expanded the TMS0100 family of sngle-chip calculators two years after its introduction in September 1971 into three different branches:

TMS0600: Increased ROM (384 Words x 11 Bits), Identical SAM (13 Digits Registers), external display drivers. Process shrink, higher functionality
TMS0700: Identical ROM (320 Words x 11 Bits), Identical SAM (13 Digits Registers), external display drivers. Process shrink, identical functionality, cost reduction of IC
TMS0800: Identical ROM (320 Words x 11 Bits), Reduced SAM (11 Digits Registers), integrated segment drivers. Process shrink, reduced functionality, higher integration

Please notice that the members of the TMS0700 family were still marketed and marked as TMS0100 but both the die and the bottom of the chip package usually sport a TMS0700 marking.

Recently fellow collector Bo Kristoffersen discovered a Datamath Version 2 (serial number 485344) sporting a 30367J PCB layout and the TMS0119 ZA0072.


Datamath™ is a trademark of Texas Instruments.

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© Joerg Woerner, July 22, 2004. No reprints without written permission.