30 lines
763 B
ArmAsm
30 lines
763 B
ArmAsm
// #LAYOUT# STD * #TAKE
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// #LAYOUT# X16 BASIC_0 #TAKE-OFFSET 2000
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// #LAYOUT# * BASIC_0 #TAKE
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// #LAYOUT# * * #IGNORE
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//
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// Math package - compare FAC1 with RAM location
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//
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// Input:
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// - .A - address low byte
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// - .Y - address high byte
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//
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// Output:
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// - .A - $00 for equal, $01 for FAC1 > RAM, $FF for FAC1 < RAM
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// - flags N/Z, depending on whether FAC1 is 0, positive, or negative
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//
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// Notes:
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// - uses vector at $24, leaves FAC1 and FAC2 unchanged (Codebase64)
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//
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// See also:
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// - [CM64] Computes Mapping the Commodore 64 - page 115
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// - https://www.c64-wiki.com/wiki/Floating_point_arithmetic
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// - https://codebase64.org/doku.php?id=base:kernal_floating_point_mathematics
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//
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// XXX provide implementation
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FCOMP:
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STUB_IMPLEMENTATION()
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