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Function 90h Device Busy Loop (except PC, PCjr, XT)

entry AH 90h

AL type code:

00h disk

01h diskette

02h keyboard

03h PS/2 pointing device

80h network (ES:BX = pointer to network control block)

0FCh hard disk reset (PS/2)

0FDh diskette motor start

0FEh printer

ES:BX pointer to request block for type codes 80h through 0BFh

return CF 1 (set) if wait time satisfied

0 (clear) if driver must perform wait

note Used by NETBIOS

Type codes are allocated as follows:

00h-7Fh non-reentrant devices; OS must arbitrate access

80h-BFh reentrant devices; ES:BX points to a unique control block

C0h-FFh wait-only calls, no complementary int 15, fn91h call


file: /Techref/int/15f/90.htm, 0KB, , updated: 2001/5/3 14:15, local time: 2024/4/25 02:43,
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