DATAMATH

DATAMATH CALCULATOR MUSEUM

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

Date of introduction:	Refurbished	Display technology:	LED modules
New price:	$119.95	Display size:	8
Size:	5.5" x 3.0" x 1.7"
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
Memories:
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.
It should read: "Vollständige Informationen sind im Handbuch angegeben" instead "vollständige Informationen sind in der Notiz eingetragen"
The printed circuit board (PCB) is the standard 30367H layout used with all Datamath Version 2 calculators. But it was refurbished...
The single-chip calculator circuit of the refurbished Datamath with an unusual designation: TMS0719 instead TMS0119.

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.

If you have additions to the above article please email: joerg@datamath.org.