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45 lines
1.4 KiB
45 lines
1.4 KiB
;***************************************************************************
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; *
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; Copyright (C) 1983,1984 by Microsoft Inc. *
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; *
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;***************************************************************************
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;***************************************************************************
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; *
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; Header file for IBM/PC timer device driver. Contains all machine *
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; specific constant and data structure definitions. *
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; *
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;***************************************************************************
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.xlist
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include cmacros.inc
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; include windefs.inc
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.list
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; picked off romstuff.inc
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DSEG equ DATA
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doffset EQU <DataOffset>
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; Approximate value of timer tic in milliseconds * 1000.
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res_low EQU 54925
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res_high EQU 0
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; equates for disk status
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REMOVEABLE equ 2
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FIXED equ 3
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REMOTE equ 4
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; Offset of Single Diskette indicator from beginning of Bios Data Area, 400h
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SingleDrive equ 104h
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; Timer structure
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tiblock STRUC
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tirate DW ? ; -1 means not used, 0 means call as fast as possible
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ticount DW ? ; -1 means end of table.
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tiproc DD ? ; far proc to call.
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tiblock ENDS
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