25 lines
470 B
ArmAsm
25 lines
470 B
ArmAsm
#if ROM_LAYOUT_STD || (ROM_LAYOUT_M65 && SEGMENT_KERNAL_0)
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//
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// Official Kernal routine, described in:
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//
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// - [RG64] C64 Programmers Reference Guide - page 297
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// - [CM64] Computes Mapping the Commodore 64 - page 238
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//
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// CPU registers that has to be preserved (see [RG64]): .A, .X, .Y
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//
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SETFLS:
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// There are 6 sane ways to implement this routine,
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// I hope this one will not cause similarity to CBM code
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sta LA
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sty SA
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stx FA
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rts
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#endif // ROM layout
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