[[Image:Silicon disk.JPG|thumb|Box and Manual for the memory expansion (464 version)]] [[Image:Silicon disc front2.jpg|thumb|A closeup of 6128 version]] A 256Kb RAM expansion for the CPC. This combined with the DkTronics 256Kb memory expansion (advertised as such) would give the CPC an additional 512Kb RAM in the case of a 464/664 or an additional 448Kb RAM in the case of the 6128 - ie: in all cases a maximum of 576Kb RAM. == Silicon Disc Versions == * "dk'tronics Silicon Disc" cartridge* "dk'tronics Silicon Disc Operation System" cartridge The difference here is probably, that the first cartridge contains plain RAM, the second additionally a BIOS ROM with RSX commands for accessing the RAM disc. == Other Versions == Dk'tronics also made the "#REDIRECT [[Dk'tronics memory expansion]]". Not sure if/how it differs from the "Silicon Disc". Maybe it's just renamed and contains exactly the same hardware... or maybe one of the devices is battery-backed, and the other isn't...? An article in Amstrad Action described how a Silicon Disk can be converted into a 256K memory expansion. I think this applies to the RAM part only. [which article is that?] == Some relevant Info from Manual == * The '''64K silicon disc''' is contained in one unit (Operating system ROM), while the '''256K silicon disc''' is in two units (256K RAM and Operating system ROM).* When the computer is powered up the ROM should sign itself on as:-** 'Silicon Disc 0.1' (for use with 64K BANKED RAM)** 'Silicon Disc 1.1' (for use with 256K BANKED RAM)* Remember the contents of the silicon disc are lost if the computer is switched off!* Advanced Notes** 64K Silicon Disc: OUT &7F00, &C4+BANK ;where BANK is 0..3** 256K Silicon Disc: OUT &7F00, &E4+(BANK AND 3)+(BANK/4)*8 ;where BANK is 0..16 == Manual == * [[Media:DKTronics_Silicon_Disk_Manual.pdf]] - DK'Tronics User Manual (English) == Download == * [[Media:Dk'tronicsSiliconDiscRomImage.zip]] - none such? (might be one or two versions existing, for 64K and 256K) The whole software (including RSX tools for creating silicon disc compatible CP/M versions) is contained in the ROM. == Pictures == <gallery>File:NoPicture.gif|Circuit Board</gallery> [[Category:Hardware]] [[Category:Peripherals]] [[Category:Memory expansions]]