| Type | Brand | Model | Released | MSRP | Description | Reference |
| Information Research Association | 4150 | 1984 | $3000.00 | Conversion of your 99/4A into a machine with minicomputer power. | HCM Aug84 p.31 | |
| Texas Instruments | PHC 002 | 1Q/1983 | $99.00 | TI-99/2 Basic Computer | BYTE May83 p.528. | |
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| Texas Instruments | PHC 004 | 2Q/1979 | $1150.00 | TI-99/4 Home Computer | BYTE Sep79 p.159 | |
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| Texas Instruments | PHC 004M | 1Q/1980 | $1400.00 | TI-99/4 with 13" Monitor | TI flyer CL 467A | |
| Texas Instruments | PHC 004A | 2Q/1981 | $595.00 | TI-99/4A Black & Silver | TI flyer CL 709 | |
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| Texas Instruments | PHC 004A | 2Q/1983 | $149.95 | TI-99/4A Beige | PSR June 1983 p.2 | |
| Texas Instruments | PHC 007 | 1982/83 | N/A | TI-99/7 prototype | Don Bynum | |
| Texas Instruments | PHC 008 | 1983 | N/A | Computer 99/8 | Don Bynum | |
| Corcomp | 9900 | 2Q/1984 | $199.95 | DS/DD capacity | Micropen May84 p.6 | |
| Texas Instruments | PHP 1800 | 1Q/1980 | $299.95 | Standalone unit | ||
| Texas Instruments | PHP 1240 | 1Q/1982 | $249.95 | P-Box Card | TI flyer CL 710 | |
| CompuAdd | 3Q/1984 | $393.00 | HCM V4N4, p.40 | |||
| CorComp | 9900 | 2Q/1984 | $249.95 | Micropen May84 p.6 | ||
| Model Masters | 4Q/1982 | $345.95 | P-Box SS/SD drive | |||
| Model Masters | 4Q/1982 | $569.95 | P-Box DS/SD drive | |||
| Model Masters | 4Q/1982 | $449.95 | Standalone SS/SD drive | |||
| Model Masters | 4Q/1982 | $649.95 | Standalone DS/SD drive | |||
| Texas Instruments | PHP 1850 | 1Q/1980 | $499.95 | Standalone unit | TI flyer CL 482A | |
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| Texas Instruments | PHP 1250 | 2Q/1982 | $249.95 | P-Box Card | TI flyer CL 710 | |
| CorComp | 9900 | 2Q/1984 | $399.95 | Tenex #29802 | Micropen May84 p.6 | |
| CorComp | 99000 | 2Q/1984 | $549.95 | Micropen May84 p.6 | ||
| Mikel Labs | 2Q/1984 | |||||
| Texas Instruments | PHP 1200 | 1Q/1982 | $249.95 | P-Box Card | TI flyer CL 710 | |
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| Tex Micro | TIMPAC | 3Q/1984 | $499.00 | TI Emulating Peripheral Access Controller; includes everything to add 32K RAM, printers, floppy disk controllers, speech synthesis, hard drive controller interface. | HCM Aug84 p.53 | |
| Tex Micro | 1984 | $796.00 | Single Drive system with 32K, Speech, RS232, and Disk Controller. | HCM V4N1, p.152 | ||
| Tex Micro | 1984 | $995.00 | Dual Drive system with 32K, Speech, RS232, and Disk Controller. | HCM V4N1, p.152 | ||
| Mechatronics | Gram Karte | Micropen Jan86 p.36 | ||||
| CaDD Electronics | Gramulator | Micropen Aug88 p.40 | ||||
| Millers Graphics | GK 01 | 4Q/1985 | $174.95 | Gram Kracker 56K chips | Millers Graphics flyer | |
| Millers Graphics | GK 02 | 4Q/1985 | $188.45 | Gram Kracker 80K chips | Millers Graphics flyer | |
| Myarc | 2Q/1983 | $2599.00 | 5Mb Winchester H/Disk | |||
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| Myarc | 2Q/1983 | $2999.00 | 10Mb Winchester H/Disk | |||
| Myarc | 4Q/1983 | $3399.00 | 15Mb Winchester H/Disk | |||
| Myarc | $735.00 | 20Mb HFDC Hard Disk | ||||
| Myarc | $775.00 | 40Mb HFDC Hard Disk | ||||
| Texas Instruments | PHP 1300 | 2Q/1983 | $59.95 | Interface for TI-99/4A | ||
| Texas Instruments | HX 1000 | 2Q/1983 | $200.00 | Printer/Plotter | ||
| Texas Instruments | HX 2000 | 2Q/1983 | $140.00 | Wafertape Digital Drive | ||
| Texas Instruments | HX 3000 | 2Q/1983 | $100.00 | RS-232 Serial Port | ||
| Texas Instruments | HX 3000P | 2Q/1983 | $120.00 | RS-232 Serial/Parallel port | ||
| Texas Instruments | PARAKIT | 2Q/1983 | $30.00 | RS-232 Parallel Upgrade | ||
| Texas Instruments | AC 9201 | 2Q/1983 | $15.00 | Wafertape drive AC Adapter | ||
| Texas Instruments | WT 05 | 2Q/1983 | $5.00 | 5' Wafertape | ||
| Texas Instruments | WT 10 | 2Q/1983 | $6.00 | 10' Wafertape | ||
| Texas Instruments | WT 25 | 2Q/1983 | $7.00 | 25' Wafertape | ||
| Texas Instruments | WT 50 | 2Q/1983 | $8.00 | 50' Wafertape | ||
| Texas Instruments | HXC 36 | 2Q/1983 | $10.00 | 36" I/O Cable with connector | ||
| Texas Instruments | PPHX100 | 2Q/1983 | $3.25 | Printer/Plotter Paper | ||
| Texas Instruments | REDGRN0 | 2Q/1983 | $4.00 | Printer/Plotter Pens | ||
| Texas Instruments | PEN 1000 | 2Q/1983 | $4.00 | Printer/Plotter Pens | ||
| Texas Instruments | HX 3100 | 4Q/1983 | $99.95 | Modem | ||
| Denali Data | Arti-Stic | 2Q/1981 | $20.00 | Adapter for Atari joysticks | Denali Data flyer | |
| Jackson Design | 1Q/1983 | $5.95 | Joystick Stabilizer | |||
| Milton Bradley | MBX 4366 | 4Q/1983 | $29.95 | MBX Joystick | MP Jun84 p.11 | |
| Newport Controls | ProStick II | 3Q/1984 | $29.95 | Left/Right Hand Joystick | HCM Aug84 p.64 | |
| Personal Peripherals | J1000 | $9.95 | Super Stik - Single joystick | |||
| Personal Peripherals | J1020 | $19.95 | Super Stik - Dual joysticks | |||
| Right Idea | Accuball | 4Q/1983 | $44.95 | Trackball | ||
| Suncom | TAC-3 | $14.95 | Competition Joystick | HCM V5N1 p.69 | ||
| Texas Instruments | PHP 1100 | 2Q/1980 | $34.95 | Wired Remote Controllers | ||
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| Trend-Tek Corp | 2Q/1983 | $9.95 | Joystick holder | Compute! May83 p.284 | ||
| Computech | 2Q/1982 | $169.95 | 10-key numeric keypad | 99er Sep83 p.10 | ||
| Denali Data | Joypad | |||||
| Box Car | 1983 | $129.95 | 32K Standalone unit | |||
| CorComp | 2Q/1984 | $135.95 | 32K card | HCM V5N4, p.65 | ||
| Doryt Systems | 3Q/1983 | $175.00 | 32K Standalone unit | 99er Magazine | ||
| Foundation | 4Q/1982 | $150.00 | 32K card | |||
| Foundation | 1Q/1983 | $160.00 | 32K Standalone unit | |||
| Foundation | 1Q/1983 | $220.00 | 128K card | Super99 Nov84 p.10 | ||
| HI-Tech Systems | 1Q/1983 | $159.95 | 32K Standalone unit | |||
| Intellitec | 1Q/1983 | $130.00 | 32K P-Box card | |||
| Intellitec | 1Q/1983 | $175.00 | 32K Standalone unit | |||
| Multicom | M1000 | 3Q/1984 | $99.00 | 32K Memory P-Box Card | HCM Aug84 p.66 | |
| Multicom | M2000 | 3Q/1984 | $124.95 | 32K Memory Add On | HCM Aug84 p.66 | |
| Multicom | 4Q/1984 | $234.95 | 32K/RS-232 Combo Add On | |||
| Myarc | 3Q/1985 | 128K card | ||||
| Tachyon Systems | T32K-S | $125.00 | 32K Standalone unit | |||
| Texas Instruments | PHP 1260 | 1Q/1982 | $299.95 | P-Box Card | TI flyer CL 710 | |
| Texas Instruments | PHP 2200 | 1Q/1981 | $399.95 | 32K Standalone unit | ||
| Ultracomp | DM-32 | 1983 | $159.95 | 32K Standalone unit | 99er Oct83 p.3 | |
| Ultracomp | CM-32 | 1983 | $269.95 | 32K Standalone unit with battery-backed CMOS | 99er Oct83 p.3 | |
| 99erWare | $5.95 | Tex-Sette Cassette Adapter | ||||
| 99erWare | $4.95 | TI Cassette Cable | ||||
| Centroplex | TIC 99/1 | $12.50 | Single Cassette Cable | HCM Aug84 p.127 | ||
| Centroplex | TIC 99/2 | $14.50 | Dual Cassette Cable | HCM Aug84 p.127 | ||
| Micro Pal | 10074 | 3Q/1984 | $4.95 | Cassette Adapter | HCM Aug84 p.123 | |
| Micro Pal | 21186 | 3Q/1984 | $13.95 | Dual Cassette Cable | HCM Aug84 p.123 | |
| Micro Pal | 22633 | 3Q/1984 | $24.95 | Peripheral Extension Cable | HCM Aug84 p.123 | |
| Micro Pal | 22647 | 3Q/1984 | $32.95 | Peripheral Extension Cable - Dual | HCM Aug84 p.123 | |
| Navarone | WD-01 | 2Q/1983 | $49.40 | Cartridge Expander | HCM V4N1 p.62 | |
| Ten-X Precision | $43.85 | Peripheral Extension Cable | HCM V5N1 p.68 | |||
| Texas Instruments | AC 9201 | 2Q/1983 | $14.95 | AC Adapter - wafertape drive | ||
| Texas Instruments | PHA 2000 | 1Q/1980 | $14.95 | Dual Cassette Cable | ||
| Texas Instruments | PHA 2010 | 2Q/1980 | $19.95 | Monitor Cable | |
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| Texas Instruments | PHA 2020 | 1Q/1981 | $19.95 | Audio Adapter | ||
| Texas Instruments | PHA 2623 | 1Q/1983 | $9.95 | External Disk Drive cable | 1983 TI Price List | |
| Texas Instruments | PHA 2625 | 1Q/1983 | $9.95 | P-Box Disk Drive cable | 1983 TI Price List | |
| Texas Instruments | PHA 2605 | 1Q/1980 | $7.95 | Blank 99/4 keyboard overlays | ||
| Texas Instruments | PHA 2640 | 3Q/1983 | $3.95 | Data Certified Cassette Tape | PSR April 1983 p.2 | |
| Texas Instruments | PHA 2641 | 2Q/1983 | $9.95 | Cassette Storage Album | PSR April 1983 p.2 | |
| Texas Instruments | PHA 2650 | 2Q/1983 | $19.95 | Blank Floppy Diskettes (5) | ||
| Texas Instruments | PHA 2651 | 2Q/1983 | $9.95 | Diskette Storage Album | PSR April 1983 p.2 | |
| Texas Instruments | PHA 2661 | 2Q/1983 | $9.95 | Cartridge Storage Album | PSR April 1983 p.2 | |
| Texas Instruments | PHP 1500 | 2Q/1980 | $149.95 | Solid State Speech Synthesizer | ||
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| Anchor | Signalman MK III | 1984 | $139.00 | TI-99/4A Compatible | HCM Aug84 p.112 | |
| Texas Instruments | PHP 1600 | 1Q/1980 | $224.95 | Acoustic carriage | TI flyer CL 465A | |
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| Texas Instruments | PHP 1290 | N/A | N/A | Internal Modem for the Peripheral Expansion Box. Never officially released. | Bryan Roppolo | |
| Texas Instruments | PHA 4000 | 1Q/1980 | $450.00 | 13" Zenith Color Monitor | TI flyer CL 467A | |
| Texas Instruments | PHA 4100 | 1Q/1981 | $374.95 | 10" Panasonic Color Monitor | TI flyer CL 711 | |
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| Apropos Technology | GP-250X | 3Q/1984 | $299.95 | Graphics Printer with PIO and Serial Interface. Direct Connect to TI-99/4A. | HCM Aug84 p.134 | |
| Axiom | $84.95 | ParallexTI PIO Interface | ||||
| Axiom | GP-100TI | 3Q/1984 | $299.00 | Direct-Connect Printer | HCM Aug84 p.52 | |
| Centroplex | PC 99/4A | $25.00 | PIO Printer Cable | HCM Aug84 p.127 | ||
| Centroplex | RS232C | $30.50 | Serial Printer Cable | HCM Aug84 p.127 | ||
| Denali Data | Split-T A/B Switch | |||||
| Micro Pal | 10021 | $24.95 | PIO Printer Cable 6' | |||
| Micro Pal | 22243 | $34.95 | PIO Printer Cable 10' | |||
| Micro Pal | 10036 | $37.95 | Okidata PIO Cable | |||
| Micro Pal | 10040 | $37.95 | Smith-Corona TP-1 PIO Cable | |||
| Micro Peripherals | MPI 99 | $425.00 | PIO Printer w/cable and single-sheet feeder | Enthusiast 99 Jan84 back cover of mailing jacket | ||
| Model Masters | 1Q/1983 | $59.95 | Joyprint joystick serial port | |||
| Multicom | 4Q/1984 | $99.00 | A/B Switch | |||
| Pueblo Instruments | PICO-1 | 1Q/1984 | $330.00 | Draft quality, 7-pin, 80cps dot matrix printer for the TI-99/4A when used with the TIPI Interface. | ||
| Pueblo Instruments | TIPI | 1Q/1984 | $65.00 | TI-99/4A specific Interface Board for PICO-1 printer | HCM V1N1 p.103 | |
| Texas Instruments | PHP 1900 | 2Q/1980 | $399.95 | Thermal Printer | TI flyer CL 481A | |
| Texas Instruments | PHA 1950 | 2Q/1980 | $12.95 | 2-pack of paper for PHP 1900 | TI flyer CL 481A | |
| Texas Instruments | PHA 2500 | 3Q/1982 | $750.00 | TI Impact Printer produced by Epson | ||
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| Texas Instruments | PHP 2700 | 1Q/1983 | $69.95 | Program Recorder | TI Home Computer Newsletter Jan83, p.2 | |
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| CorComp | 512K P-Box Card | |||||
| DaTaBioTics | Grand RAM | |||||
| Foundation | 512K P-Box card | |||||
| Horizon Computing | ||||||
| Myarc | ||||||
| AJ International | 1Q/1983 | $169.95 | ||||
| Box Car | $129.95 | |||||
| Centroplex | RS232Y | $30.50 | RS232 Y Cable | HCM Aug84 p.127 | ||
| CorComp | 2Q/1984 | $117.95 | P-Box Card | |||
| Doryt Systems | 3Q/1983 | $105.00 | Standalone unit | |||
| Micro Pal | 10055 | $24.95 | RS-232 Cable | HCM Aug84 p.123 | ||
| Micro Pal | 10069 | $49.95 | RS-232 Y-Cable | HCM Aug84 p.123 | ||
| Mikel Labs | 2Q/1984 | $149.95 | Standalone unit | |||
| Multicom | Com Adapter | 3Q/1984 | $144.95 | Standalone unit | HCM Aug84 p.66 | |
| Myarc | ||||||
| Texas Instruments | PHP 1220 | 1Q/1982 | $174.95 | Peripheral Expansion Box Card | TI flyer CL 710 | |
| A/D Electronics | 2Q/1983 | $299.85 | First-Aide Home Control System | |||
| CorComp | 99 Home Sentry System | Com Shop Aug86 p.214 | ||||
| Denali Data | 3Q/1981 | $60.00 | Backer Bus | 99er Magazine | ||
| Denali Data | 3Q/1981 | $60.00 | Stacker Bus | 99er Magazine | ||
| Foundation | $249.00 | 80-column display card | HCM Aug84 p.144 | |||
| Foundation | 1Q/1985 | Clamshell Card | ||||
| Foundation | 4Q/1985 | Z80A Card | Micropen Nov85 p.40 | |||
| Kantronics | $369.90 | Ham Radio Interface | HCM V5N1 p.45 | |||
| MBP | Clock/ADC card for P-Box | |||||
| Micromagic Software | ADM-100 | 3Q/1984 | $79.95 | Analog to Digital Interface | HCM Aug84 p.52 | |
| Micromagic Software | LVM-99 | 3Q/1984 | $249.00 | Videodisc Interface and Controller | HCM Aug84 p.52 | |
| Micro Pal | 22102 | $44.95 | Amdek Plotter Cable | |||
| Miller Communications | Video Grabber | |||||
| Milton Bradley | ???? | 2Q/1983 | $???.?? | Milton Bradley Expander | Bryan Roppolo | |
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| Milton Bradley | MBX 4340 | 4Q/1983 | $129.95 | MBX Expansion System | MP Jun84 p.11 | |
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| Morning Star | 3Q/1983 | $595.00 | CP/M card and software | HCM V4N1 p.25 | ||
| Palomar | $239.90 | Ham Radio Interface | HCM V5N1 p.45 | |||
| Personal Peripherals | 1984 | $59.95 | Super Sketch Graphics Tablet | HCM V4N5 p.43 | ||
| Texas Instruments | PHP 1270 | 1Q/1982 | $249.95 | p-Code Card | TI flyer CL 710 | |
| Texas Instruments | PHP 2300 | 1981 | $699.95 | Video Controller | TI Brochure 45302 CS 382 | |
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WOG 12/27/1999
Audio Adapter (PHA 2020) is a headphone set that plugged into the 99/4 console.
Com Shop = Computer Shopper
Micropen = MICROpendium magazine.
PSR = Product Support Review, which was a Texas Instruments' internal newsletter.