The TS 1500 uses your standard television for its display, "broadcasting" on either channel 2 or 3. It defaults to TV channel 2, but if you press the "3" on the keyboard within a few seconds of turning the computer on, it will then use channel 3 instead. Very tricky indeed!
This improved keyboard on the TS 1500 has the same layout as the earlier versions, meaning that each key may do up to five different functions, depending on how many keys are pressed and in what order.
Although the TS 1500 comes with 16K internal RAM, an external 16K RAM pack can be added for a total 32K RAM. A few keyboard commands (POKEs) are required for the system to recognize the additional memory space.
Being a very inexpensive computer system, an equally inexpensive data storage method makes the most sense. This was accomplished by utilizing a standard cassette recorder for data storage and retrieval. While almost any consumer recorder would work, Timex sold the very shiny Timex Sinclair 2020 recorder for that professional touch. From oldcomputers.net