The TS1000 is an American version of the Sinclair ZX81. The only technical difference is that the ZX81 has only 1K of RAM as standard, versus the TS1000's 2K. Please read the ZX81 review for more information on this slightly unusual hardware platform. Note that the TS1000's manual is descended from the US version of the ZX81 BASIC Programming manual. I have scanned the TS1000's instruction manual and put it online in PDF format. Click the image below to download it (or right-click and choose Save As). My original scan is at 200dpi, but to make the download reasonable I have downsampled it to 72dpi. I suggest you don't zoom in on it - the text is most legible at 1:1 zoom./P>
For your interest, I have also scanned the motherboard of the TS1000, the circuit inside the TS1016, and the keyboard of the computer. Clicking the small versions of these images below will open a new window containing the full-size 300dpi scan.
For some time, Sinclair had sold the ZX81 in the US via mail-order (ZX81 units sold in the US are labeled slightly differently from the UK edition). However, when Sinclair subcontracted their manufacturing to Timex in 1982, the US market "domestic" version of the machine became the Timex-badged TS1000. Timex presumably did the first-ever FCC certification on this hardware, because the import models of the ZX81 have a "fake" FCC ID on them whereas the TS1000 has a real, catalogued ID. The UK edition is already fairly heavily RF shielded (the entire interior of the case is metallized), and I doubt that any significant modifications were made to gain FCC approval.
The TS1000 is a fairly common item still on ebay; as of the time of writing (August 2000), you should expect to pay no more than US$50 for a mint-condition TS1000 and RAM pack, and probably some software too.
Please see the ZX81's emulator section for information on emulating the TS1000.