Texas Instruments TI-58C IMCO MudMod

Date of introduction:  1982 Display technology:  LED-stick
New price:   Display size:  10 (8 + 2)
Size:  6.4" x 3.2" x 1.5"
 162 x 81 x 37 mm3
Weight:  8.5 ounces, 240 grams Serial No:  1046453
Batteries:  BP1A Date of manufacture:  wk 07 year 1981
AC-Adapter:  AC9131 Origin of manufacture:  USA (ATA)
Precision:  13 Integrated circuits:  TMC0501E, TMC0580 (CD2400), TMC0580 (CD2401), TMC0573, TMC0591, Toshiba TC5047AP
 TMC0540 (CD5691)
Logic:  AOS - 8 Pending Operations, 9 ()    
Memories:  0-60    
Program steps:  480-0 Courtesy of:  Joerg Woerner
    Download manual:   (US: 8.9M Bytes)

The innovative TI-58C was the perfect base for a lot of customized calculators. The idea behind these products was the novelty of the Solid State Software Modules™ with up to 5000 program steps.

The IMCO "MudMod" application was developed in 1982 by IMCO Services, a division of Halliburton Co., Houston for internal use only. IMCO's first module ("DrilMod") with applications in the areas of well control, annular and bit hydraulics, directional design, d-exponents, cost/ft, and drilling mud, a total of 16 programs in all, and second module (“BossMod”) for well-control operations were sold to customers.

Don't miss the Optimum Mud Hydraulics application, developed later in 1979 by Magnet Cove Barium Corporation - better known as Magcobar.

We know five different approaches of the module expansion:

• Standard modules like the Master Library use only the small sticker
   above the A,B,C,D, and E keys.
• Other modules like the Pool Water Analysis developed by Olin Corporation
   make use of a colorful keyboard mask.
• Customized calculators like the USMC AV-8C calculator or insurance calculators
   sold by Allianz and others use special keyboard arrangements.
• The CAL-Q-TAX calculator uses an extender instead the usual drop-in modules.
• The Kodak Q-700 Program Adapter makes use of a snap-on cover with
   an individualized printing.

Information about the DrilMod, BossMod and MudMod applications provided by Mario Zamora. Thanks!

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© Joerg Woerner, AApril 3, 2021. No reprints without written permission.