Byte stream
V.0
| Spectrum
| 1984: first release of Daley Thompson's Decathlon
| complex: identical short tones, 2-edge separators and 2-edge SYNC
| ~2000
| 7
| simple: no internal separators
|
V.1
| Spectrum
| 1985: Bounty Bob Strikes Back, Highway Encounter
| complex: four different short tones, 2-edge separators and 2-edge SYNC
| ~2000
| 6
| simple: no internal separators
|
V.2
| CPC
| 1985: Highway Encounter; 1986: Alien Highway, Batman, Donkey Kong, Mercenary; 1987: Arkanoid, Head over Heels
| complex: four different short tones (five in Mercenary), 2-edge separators and 2-edge SYNC
| ~2000
| 5
| simple: no internal separators
|
V.3
| Spectrum
| 1986: Alien Highway, Tarzan; 1987: Leviathan, Head over Heels
| complex: four different short tones, 2-edge separators and 2-edge SYNC
| ~2000
| 6
| complex: 42-edge internal separators
|
V.4
| CPC
| 1986: Tarzan; 1987: Combat School, Gryzor, Renegade, Wizball; 1988: Guerrilla War, Renegade II: Target Renegade
| complex: four different short tones, 2-edge separators and 2-edge SYNC
| ~2000
| 5
| complex: 42-edge internal separators
|
V.5
| Spectrum
| 1987: Athena, Combat School, Wizball
| simple: one long tone and 16-edge SYNC, no separators
| ~2000
| 6
| complex: 42-edge internal separators
|
V.6
| CPC
| 1988: Arkanoid II: Revenge of Doh, Operation Wolf; in general, all Speedlock tapes for CPC after 1988
| complex: four different short tones, 2-edge separators and 2-edge SYNC
| ~1600
| 5
| complex: 42-edge internal separators
|
V.7
| Spectrum
| 1988: re-release of Daley Thompson's Decathlon; in general, all Speedlock tapes for Spectrum after 1988
| simple: one long tone and 16-edge SYNC, no separators
| ~1600
| 6
| complex: 42-edge internal separators
|