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Codemasters CD

475 bytes added, 14:25, 1 July 2010
/* Info Fragments on Spectrum CD Games Pack (Code Masters) (1989) */
Bit 1 (joystick right/key '2') of port &f7fe is data.
The loader is patched according to the interface chosen and appears to be a modified Spectrum ROM loader.It seems to load the standard tape data structure: pilot, sync byte, data bytes and checksum byte. The cable is most likely to be mono, because only 1-bit is used for loading. No info if/how the stereo signal is used (maybe one channel used as CLOCK, and the other channel as DATA...?) The cable does reportedly contain a 1bit A/D converter, which is probably a single transistor or so (so it's mono, not stereo?). The CD capacity is said to be "12 Megs" (presumably meaning 12 Megabit = 60 tracks with 25Kbytes each). It is more probable that the Amstrad loader is similar to the Spectrum loader:1. The CPC has same CPU as the Spectrum2. The CPC already has a number of loaders based directly on the Spectrum ROM loader, so a conversion of this loader to CPC would be easy.
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