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35 lines
636 B
ArmAsm
35 lines
636 B
ArmAsm
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;
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; 2022-03-15, Karri Kaksonen
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;
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; clock_t _clocks_per_sec (void);
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;
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.export __clocks_per_sec
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.import sreg: zp
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.import _paldetected
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.include "atari7800.inc"
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.macpack generic
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.code
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;-----------------------------------------------------------------------------
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; Return the number of clock ticks in one second.
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;
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.proc __clocks_per_sec
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lda #0
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tax
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sta sreg ; return 32 bits
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sta sreg+1
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lda _paldetected
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bne pal
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lda #60 ; NTSC - 60Hz
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rts
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pal:
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lda #50 ; PAL - 50Hz
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rts
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.endproc
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