Computer Closet Collection

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Texas Instruments 99/4A

See below for specifications and information on this system.

Specifications and information

Key Dates: Announced June, 1979
Ships November, 1979
Peripheral Expansion Box (PEB) announced January, 1982
Original Price: $1500
CPU: Texas Instruments TMS9900
Memory: 16K RAM, 26K ROM
Display: 32 characters by 24 lines text, 152x192 16 color graphics
Operating System: ROM BASIC, assisted by Enhanced BASIC in a cartridge, and a disk management cartridge
Input/Output: Built-in keyboard, cartridge port, expansion port for Peripheral Expansion Box (PEB), composite video monitor output
Bus: Proprietary
Cards Installed in PEB: 32K RAM, floppy disk controller, serial port, flex cable interface
Other Items in Collection: Peripheral Expansion Box, pair of joysticks, various cartridges
Items Needed: Floppy disk software

Here's a shot of the Computer Closet's complete TI 99/4A system with Peripheral Expansion Box (PEB) with one 5 1/4" floppy disk drive, 32K RAM expansion, RS-232 card, Flex Cable Interface, and Disk Manager 2 cartridge.

Here's the TI 99/4A original color display box:

Texas Instruments Advertisements

Here are some classic advertisements from TI. Click a thumbnail to see a larger version of the picture.

"Two Bytes Are Better Than One" in this silly ad for the TMS 9900 microprocessor circa May 1977.
TI994A-CosbyAdThumbnail.jpg (1679 bytes) By late 1982, the IBM PC was out, the Apple II was king of the home market, and even Bill Cosby couldn't save the 99/4A system, despite the recent announcement of the Peripheral Expansion Box pictured here.

Texas Instruments 99/4A FAQ


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