DATAMATH CALCULATOR MUSEUM |
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 | |
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 January 1975. | |
It should read: |
|
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? 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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, July 22, 2004. No reprints without written permission.