DATA TRANSFER APPARATUS FOR A MICROCOMPUTER SYSTEM

摘要

Apparatus for rapidly transferring data between a central processing unit (CPU) of microcomputer apparatus and floppy disc drives, includes a floppy disc controller for interfacing the floppy disc drives with the CPU and generating an interrupt request status signal indicating whether a command has been executed and a data request status signal indicating whether data is to transferred between the floppy disc controller and the CPU, the CPU generating command signals in response to these status signals; a data bus connecting the CPU to data access lines of the floppy disc controller; a bidirectional buffer interposed between the data bus and the data access lines for gating the data between the floppy disc controller and the CPU through the data bus and for gating the interrupt request status signal and data request status signal through the data bus to the CPU in response to gating signals; first and second gate circuits for gating the status signals to the buffer in response to the gating signals; a NOR gate for supplying gating signals to enable the buffer in response to the command signals; and an OR gate for supplying gating signals to enable the first and second gate circuits in response to the command signals, whereby rapid data transfer is achieved without using a direct memory access controller.