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Last modified 2026-02-02

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Texas Instruments TI-99/4

A picture of Texas Instruments TI-99/4

SPECIFICATIONS

GENERAL
Type:16-bit home computer
CPU:TMS9900 @ 3.3 MHz
Operating system(s):TI Basic and integrated equation calculator
Memory:ROM: 26 KB (Expandable)
RAM: 16 KB (Expandable)
Power supply:
Current drain / power consumption:
Dimensions (W*H*D):381*71*259 mm (15*2.79*10.2")
Weight:2.3 Kg (5.07 lb)




I/O
Keyboard:Integrated
Graphics:192*256 pixels, 16 colors
Audio:3 tones, 5 octaves plus noise
Storage:Tape recorder
External I/O ports / connectors:
Game port:   ?
Tape I/O:   ?
Peripheral port:   44-pin ?
Cartridge slot:   ?
Video out:   ? (Composite)
Audio out:   ?
Other:




MISCELLANEOUS
Manufactured:1979-1980 (Discontinued)
Additional info: Over 20000 were manufactured.
Related documents:
Modifications and fixes:
Notable "ham" software:
Reviews:
Some options / Accessories:
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A picture of Texas Instruments TI-99/4 motherboard
A picture of Texas Instruments TI-99/4 power supply board