Pethu SpecDrum is a free sample library for Native Instruments Kontakt that captures the 32 sounds from the 4 drum kits available on the vintage Cheetah SpecDrum drum sampler.
Here's what they have to say about it:
The Cheetah SpecDrum was a poor man’s Linn alternative – an 8-bit, 3-channel sample player that bolted onto the back of a Sinclair ZX Spectrum computer. Both sequencer program and drum samples had to fit in 48KB’s of RAM, so no wonder long cymbal crashes are in short supply! Despite that, the sounds are surprisingly good.
This set was captured using the Spectaculator 7 Spectrum emulator which includes an emulation of the Cheetah SpecDrum hardware.
See the Pethu site for the SpecDrum download and some other interesting freebies.