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Texas Intruments TI99/4A
The Silver...! I had been on the lookout for a TI-99/4A for quite a while when I found this one. It is a platform I am not very familiar with yet, so there will definitely be a video where I take a closer look at this lovely computer and start exploring what makes the TI-99/4A different from the other home computers in my collection.
The software side of this machine became much more interesting when I found a large collection of TI-99/4A software on 3.5-inch disks. There are more than 150 disks in total, containing over 800 separate programs. These are not disks I can simply run on my own physical TI-99/4A setup, but they are still very valuable from an archive perspective. I received the disks from a serious TI-99 collector, who in turn had obtained them from the chairman of the Dutch TI user group. That gives the collection a nice bit of provenance, and it also makes me curious about what is hidden across all those disks. For RetroMelsArchive, this makes the TI-99/4A a particularly interesting platform. Even if I cannot use the 3.5-inch disks directly on my own hardware, the software can still be preserved, listed, and made accessible to others. This turns the TI-99/4A from a machine I was simply curious about into a real archive project. |
Released in
1900
System Overview
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Why the TI994A mattersThe Texas Instruments TI-99/4A is historically interesting because it was one of the most unusual home computers of the early 1980s. Unlike many competing 8-bit home computers, it used Texas Instruments’ TMS9900, a 16-bit processor running at 3 MHz. That gave the machine a very different architectural background, even though the rest of the system design also introduced some practical limitations.
The TI-99/4A also stands out because of its strong cartridge-based software ecosystem, its distinctive expansion system, and its famous Speech Synthesizer peripheral. For many people, the speech module is one of the defining accessories of the platform, making games and educational software feel much more futuristic than many other systems of the same period. |
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Technical specifications
| Specification | Details | Source |
|---|---|---|
| Manufacturer | Texas Instruments | [1] |
| Model | TI-99/4A | [1] |
| Release year | 1981 | [1] |
| CPU | Texas Instruments TMS9900, 16-bit microprocessor | [2] |
| RAM | 16 KB RAM | [1] |
| Video RAM | 16 KB Video Display Processor RAM | [2] |
| Graphics chip | TMS9918A-family Video Display Processor | [2] |
| Graphics | 256 × 192 graphics, 16 colours, hardware sprite support | [1] |
| Sound | TMS9919 / SN76489-family sound hardware with music and noise channels | [3] |
| Storage | ROM cartridges, cassette tape and optional floppy disk system | [1] |
Collection status
| Collection status | Details |
|---|---|
| Condition | Present in the collection and ready for further exploration |
| Video plans | Planned for a future video taking a closer look at the platform |
| Collection state | To be explored further |
RetroMelsArchive Resource
| Resource | Access |
|---|---|
| TI-99/4A archive overview | Visit overview |
| 3.5-inch disk archive | Browse disks |
| A-Z software index | Browse A-Z |
| Cartridge ROMs | Pending inquiry |
| Documentation | Coming soon |
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Magic smoke reportPASSED: This TI994A works!
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