838 Designs
838-32K-X1 Memory Expansion Card (838-32K-X1)
SRAM 32K memory expansion card for the TI-99/4A Expansion box.
838-Serial Adapter (838-SerialAdapter)
Serial Adapter to align DCE/DTE pins with standards.
838-MX99 Replacement Keyboard (MX99)
MX99 Keyboard — A Modern Mechanical Upgrade for the TI‑99/4A
838-TI Audio Breakout Adapter (838-TIAudioBrkOut)
Cleanly breaks out TI‑99/4A audio for F18A and Pico9918 users. Plugs into the DIN‑5 port and delivers a dedicated audio + ground output for modern setups. Supports PC speaker or RCA connections, giving you an easy, reliable way to route TI audio to today’s displays, speakers, or capture gear.