General TI-99/4A Info:

CPU:       16-bit TMS9900 @ 3 MHz 64-pin DIP
Memory	   16 KB Base RAM and Expandable to 16MB 
Graphics:  TMS9918A S-Video out
Sound	   TMS9919, later SN94624 - 3 voices, 2 noise - 110 Hz to 115 kHz

Programming

- TI BASIC and Extended BASIC manual - Part I

- TI BASIC and Extended BASIC manual - Part II with ASCII chart

- TI-99/4A Editor Assembler manual

Code:

- TI BASIC and TI Extended BASIC Code
- - Games [text and audio] Code
- - Utility Code

Hardware:

- How can I use 16-bit computer hardware that was from 1981? "There is a hack for that"

- Want to make a drive or a 32k RAM expansion? Here is the pin out of the 44 pin side port for external memory and disk control.

Creating your own game adapter is cheaper than purchasing and easy!
- Creating an game adapter for the Atari CX-30 Joystick, Sega Genesis game pad, ColecoVision Flashback Controller, and Atari Video Touch pad.

Here is a cassette tape drive replacement option.
- Using a modern computer as a WAV file server for the TI-99/4A (instead of cassette drive)

- Connecting a TI-99/4A to a HDMI or RCA S-Video TV/monitor

- Here is the Ti-99/4A cart pinout

Photos of my two current TI-99/4As. I no longer have my original TI computer.

Side by side TI-99/4As with output on one of the HDMI monitors

TI-99/4A #2

TI with manual - TI with my artificial PEB (WAV and File server)

TI-99/4A #3

This TI is in very good condition.

See how the TI-99/4A fits in the TI computer history timeline.