This is a stick-on overlay which can be applied over a ZX81 replacement membrane in the style of ZX80 (4K keywords), ZX80 (8K keywords), ZX81 or TS1000.
ZX81 replacement membranes are available, but there are no versions for the TS1000. The keywords are slightly different, so you can apply these overlays on top of a ZX81 membrane to get the correct TS1000 keywords.
There are also versions in the colour scheme of the ZX80 for ZX80 clones (such as my Minstrel ZX80 clone). The ZX80 had two versions of BASIC. The later 8K (floating point) BASIC used the same keywords as the ZX81, the earlier 4K (integer only) BASIC used a smaller set in different positions. I have two versions for the ZX80. One with the 4K keywords, and one with the 8K keywords. You can use the ZX80 8K overlay with a ZX81 as the keywords are the same, just the colours are different.
This is a modern direct replacement membrane for a ZX81 computer, with the standard ZX81 keywords.
This is a stick-on overlay which can be applied to a ZX81 replacement membrane. White keys with TS1000 keywords.
This is a stick-on overlay which can be applied to a ZX81 replacement membrane. Blue keys with ZX80 4K keywords.
This is a stick-on overlay which can be applied to a ZX81 replacement membrane. Blue keys with ZX80 8K / ZX81 keywords.
Note the overlays are just stick on overlays, you need an original or replacement ZX81 keyboard membrane to stick these onto (available as an option).
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