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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. 

Features. 
  • 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

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

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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Articles

Memories - Getting Started with the Texas Instruments TI-99/4A by Stephen Shaw

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