Boots compilation "10 Titles for the Spectrum Plus" protected by speedlock 2
http://www.worldofspectrum.org/infoseekid.cgi?id=0013156
it appears that the first tape uses speedlock 2 protection scheme for the following ultimate play the game titles:
Jetpac
Atic Atac
Cookie
Pssst
The speedlock loader is located at the top of the 48K ram which makes Jetpac, Cookie, Pssst incompatible with 16K spectrum.
This is not the case with first ultimate play the game releases.
Tranzam and Lunar Jetman use standard rom loader.
I suppose one of the reason why they used speedlock 2 was to reduce tape length.
Afaik Speedlock 2 uses a 150% speed acceleration compared to rom loader.
I couldn't check titles Tapper, Spy Hunter, Zaxxon, Blue Max on tape 2 because it's damaged.
it appears that the first tape uses speedlock 2 protection scheme for the following ultimate play the game titles:
Jetpac
Atic Atac
Cookie
Pssst
The speedlock loader is located at the top of the 48K ram which makes Jetpac, Cookie, Pssst incompatible with 16K spectrum.
This is not the case with first ultimate play the game releases.
Tranzam and Lunar Jetman use standard rom loader.
I suppose one of the reason why they used speedlock 2 was to reduce tape length.
Afaik Speedlock 2 uses a 150% speed acceleration compared to rom loader.
I couldn't check titles Tapper, Spy Hunter, Zaxxon, Blue Max on tape 2 because it's damaged.