uPD765a Floppy Disc Controller Emulator - Development files "765" is an emulation of the uPD765a (AKA Intel 8272) Floppy Disc Controller [FDC] as used in Amstrad computers such as the PCW, CPC and Spectrum +3. At present it is not a "full" 765; features not used in the PCW BIOS (such as: DMA; multisector reads/writes; multitrack mode) are either left unimplemented or incomplete.