TI-99/4A

TI-99/4A · 1981–1984 · desktop

Specifications

Cpu: Texas Instruments TMS9900, 3 MHz
Ram: max: 16 KB on board; up to 32 KB (52 KB total addressable) with a Peripheral Expansion Box memory card · base: 16 KB
Ports: Solid State Software cartridge slot · 2× joystick ports · Cassette port · RF and composite/monitor video out · Peripheral Expansion Box connector
Display: TMS9918A video processor: 16 colors, 40×24 character-cell text limited to 28 columns in TI BASIC, 256×192 graphics modes
Storage: base: Cassette tape (no internal storage) · options: 5.25" floppy disk drive via the Peripheral Expansion System
Os Support: latest: TI Extended BASIC cartridge, or TI-99/4A with a Peripheral Expansion Box running TI's Disk/Editor Assembler system · shipped: TI BASIC in ROM
Release Price: $525

Variants

Revisions

TI-99/4A QIQIQuality Improved board, Aug 1983, cartridge lockout, 1983 copyright splash

Colors

Silver / Putty (original)1981 launch, two-tone case with dark grooved keyboard section

BeigeJune 1983 all-plastic cost-reduced case

Upgrade paths

RAM

32 KB expansion card in the Peripheral Expansion Box · The PEB is a separate chassis of card slots connected by a ribbon cable; the 32K memory card, disk controller, and RS-232 card were the common combination for serious use.

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