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36 lines
912 B
ArmAsm
36 lines
912 B
ArmAsm
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; 2016-02-28, Groepaz
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; 2017-06-15, Greg King
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;
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; unsigned char cpeekrevers (void);
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;
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.export _cpeekrevers
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; Get a system-specific file.
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; Note: The cbm610, and c128 targets need special
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; versions that handle RAM banking and the 80-column VDC.
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.if .def(__C16__)
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.include "plus4.inc" ; both C16 and Plus4
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.elseif .def(__C64__)
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.include "c64.inc"
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.elseif .def(__CBM510__)
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.import CURS_X: zp, SCREEN_PTR: zp
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.include "cbm510.inc"
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.elseif .def(__PET__)
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.include "pet.inc"
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.elseif .def(__VIC20__)
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.include "vic20.inc"
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.endif
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_cpeekrevers:
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ldy CURS_X
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lda (SCREEN_PTR),y ; get screen code
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and #$80 ; get reverse bit
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asl a
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tax ; ldx #>$0000
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rol a ; return boolean value
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rts
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