Texas Instruments TM 990 / 189

This may look like a calculator - the keyboard is from a TI-59 calculator - but it's a training system for the TMS 9980A processor. 

  • 1024 bytes of RAM, expandable to 2048 bytes. 
  • 4096 bytes of ROM, expandable to 6144. 
  • 2 MHz crystal controlled clock. 
  • Audio cassette interface. 
  • 16 bit programmable I/O port and interrupt monitor (TMS 9901). 
  • 45 key alphanumeric keyboard. 
  • Ten digit, sever segment LED display. 
  • Visual and audio output. 
  • Resident system monitor and assembler. 
  • Single step instruction execution. 

This board is co-branded Radio Spares.

Manufacturer: Texas Instruments
Date: March 1982

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Texas Instruments TM 990 / 189 Manuals:

Item Manufacturer Date
Helios C40 Distributed Software Limited Unknown
TI Programmable 57 Introduction to Programming 1977
TI-5120/TI-5130 Owners Manual T I 1981

Texas Instruments TM 990 / 189 Articles:

Item Manufacturer Date
Acorn ACA42 486 Processor Card Acorn Unknown
Acorn ACA56 PC Card (Upgraded) Acorn Computers Unknown
TMS6100 Speech Emulator Upgrade Unknown
TI Silent 700 ASR Data Terminal Texas Instruments 1975
Burr-Brown TM70 Microterminal Burr-Brown 1982
TI Program Recorder PHP 2700u Texas Instruments 1983
Cheetah 125+ Joystick Cheetah Marketing Ltd 1986
Acorn ACA42 PC Card Acorn 1994
TI calculator-based ranger (CBR) Texas Instruments 1997

Other Systems Related To Texas Instruments TM 990 / 189:

Item Manufacturer Date
Texas Instruments TM 990 / U89 Texas Instruments Unknown
Texas Instruments TI-990 Computer System Texas Instruments 1975
Texas Instruments - TI-99/4 Texas Instruments 1979
Texas Instruments - TI-99/4A Texas Instruments 1st June 1981
Texas Instruments TravelMate 4000E Texas Instruments March 1994
TI PS6560i Personal Organiser Texas Instruments May 1996

This exhibit has a reference ID of CH50497. Please quote this reference ID in any communication with the Centre for Computing History.


Texas Instruments TM 990 / 189

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