35 lines
624 B
ArmAsm
35 lines
624 B
ArmAsm
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;;;
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;;;
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;;; clock.S
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;;;
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;;; retrieve tickcount from PC-6001's internal timer
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;;;
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;;; @author Takahide Matsutsuka <markn@markn.org>
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;;;
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;;; $Id: clock.S,v 1.1 2007/09/11 12:12:59 matsutsuka Exp $
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;;;
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.globl _clock_time
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.area _GSINIT
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;; ---------------------------------
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;; unsigned long clock_time();
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;; __BCDEHL____
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;; return long value as (DE, BC)
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;; ---------------------------------
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;; this function uses PC-6001's internal timer
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;; which counts up 2 per 1/512 sec.
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.area _CODE
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_clock_time:
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ld hl, #0xfa28
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ld c, (hl)
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inc hl
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ld b, (hl)
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inc hl
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ld e, (hl)
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inc hl
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ld d, (hl)
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ld l, c
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ld h, b
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ret
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