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 Januaray, 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  Probably made Texas in 1973 a small mistake: The original Datamath Version 2 sported the TMS0119 calculator chip with a ROM-Code ZA0052. With the introduction of the Datamath Version 3 the ROM-Code was changed to ZA0072 but the chip designation was kept TMS0119. 
Two different software versions and one part name - problems are pre-programmed. We assume that Texas Instruments manufactured for repairs of the early Datamath Version 2 a batch of TMS0119 with the "old" ROM-Code ZA0052 and used the odd designation TMS0719 to avoid misunderstandings.

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.