* [[Media:The PDS Editor Manual.pdf]] - Describes the PC side (2nd edition, 1988)
* [[Media:PDS guide early version.pdf]] - Describes the PC side (early version with only 4 pages)
* [[Media:P.D.S. Manual.pdf]] - Describes PC side - assembler/download/debugger Assembler directives, Download protocol, Debugger (54 pages) (1987) (OCRed version form worldofspectrum.org)
See DL0,DL1,DL2 source code files for more info on the download protocol.