24 lines
524 B
ArmAsm
24 lines
524 B
ArmAsm
;; #LAYOUT# STD * #TAKE
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;; #LAYOUT# * KERNAL_0 #TAKE
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;; #LAYOUT# * * #IGNORE
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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 ; logical number
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sty SA ; secondary address
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stx FA ; unit number
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rts
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