http://www.keyboardmuseum.com/d_machines/vdrums.html
VERY VERY old skool virtual drum machines (Flash based) an interesting and interactive look at some traditional preset drum machines.
The Boss DR-55 Drum Machine. Originally made 1979
1.0 meg download
The Univox Microrhythmer 12 rhythm machine. Originally made 197?
288k download
The Electro-Harmonix Rhythm 12 rhythm machine. Originally made 197?
304k download
The Wurlitzer Swing Rhythm 5020 rhythm machine. Originally made 197?
176k download
The Maestro Rhythm MRQ-1 rhythm machine. Originally made 197?
272k download
The Oberheim DX drum machine. Originally made in 1983.
128k download