I/O control system for a plurality of peripheral devices

Details I/O control system for a plurality of peripheral devices I/O control system for a plurality of peripheral devices

1991-03-05

1992-05-12

Shaw, Gareth D.

Boots, shoes, and leggings

395700, 364DIG1, 3642362, 3642383, 3642403, 3642446, 3642481, 3642592, 3642809, 3642842, 3642802, G06F 1310

Patent

active

051134977

ABSTRACT:
A basic input and output system program, (BIOS) includes a 16-bit interface hard disk controller, (HDC) control routine and an 8-bit interface HDC control routine, and also includes an automatic HDC type determination routine. The 16-bit interface HDC has an inherent I/O address (I/O port), but the 8-bit interface HDC has no inherent I/O address (I/O port). By utilizing this fact, a CPU writes specified data at the I/O address inherent to the 16-bit interface HDC. The CPU then reads out the data from the I/O address, and compares the read data with the written data. If a coincidence is obtained, the CPU determines that the 16-bit interface HDC is used, and sets up a 16-bit interface HDC control routine. On the other hand, if no coincidence is obtained, the CPU determines that the 8-bit interface HDC is used, and sets up an 8-bit interface HDC control routine.

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