DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-5040 (Version 2)
|Date of introduction:||June 1978||Display technology:||Fluorescent|
|New price:|| $149.95, £109.95
|Size:||9.5" x 9.2" x 2.7"||Printer technology:||Thermal TP-20225, TP-27225|
|Weight:||3 pounds 5 ounces||Serial No:||1409135|
|Batteries:||Date of manufacture:||wk 20 year 1981|
|AC-Adapter:||120 V||Origin of manufacture:||USA (MTA)|
|Memories:||1 + 1|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 6.0M Bytes)|
The original TI-5040 desktop printing calculator received in 1978 an internal redesign to reduce manufacturing costs. The TI-5040 was a great success for Texas Instruments, it was manufactured more than 5 years before its successor, the TI-5142 was introduced. Later models like the TI-5040 II or the TI-5130 had shorter life cycles.
Dismantling this TI-5040 (Version 2) manufactured in May 1981 by Texas Instruments in Midland, Texas reveals a very clean design using one printed circuit board (PCB) and centered around a TMC0261 single-chip calculator circuit based on the TMC0980 family introduced with the TI-30 and related to the TMC0270 family used with the Speak & Spell.
The internal design of the original TI-5040 uses two PCBs and two members of the famous TMS1000 Microcomputer family. The first chip labeled TMC1115 is manufactured in PMOS (p-channel metal-oxide-semiconductor) technology similar to the original Canon Pocketronic and features 2k*8 Bits ROM plus 128*4 bits RAM in a 28-pin DIP (Dual In-line Package) housing while the second chip labeled TMS1276 combines half the memory capacity (1k*8 Bits ROM and 64*4 bits RAM) with some extra Input/Output lines and drivers for the VFD in a 40-pin DIP housing.
While the overall appearance of the TI-5040 didn't change, offers the bottom-side of the housing an easy indication of the Version of the TI-5040:
• Version 1: Printed label
with manufacturer/model info in the center of the housing.
No cut-out for the printer paper roll
• Version 2: Manufacturer/model info molded into the left side of the housing.
Cut-out for the printer paper roll on the right side of the housing
The TI-5220 printing desktop calculator with similar specifications but sporting a 12 digits display was introduced in 1977 together with its huge sibling TI-5225. Don't miss the TI-5135 introduced in 1980.
Even Texas Instruments never mentioned the rare TI-500, a printing calculator introduced already in 1974.
Offers the best of two worlds. An easy-to-read display. A printed tape.
© Texas Instruments, 1981
If you have additions to the above article please email: email@example.com.
© Joerg Woerner, December 5, 2001. No reprints without written permission.