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implemented MOVFM math routine

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FeralChild64 committed 2020-01-29 21:12:01 +01:00
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commit 35712baca7
10 files changed
+38 -61
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c64/basic/,stubs_math/bbd4.MOVMF.s
+5 -4
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@@ -3,17 +3,18 @@
// #LAYOUT# * * #IGNORE
//
// Math package - fetch FAC1 from RAM location
// Math package - copy FAC1 to memory location, rounds if asked
//
// Input:
// - .A - address low byte
// - .X - address low byte
// - .Y - address high byte
// - $70 - if MSB is set performs rouding
//
// Output:
// - .A - FAC1 exponent, affects status flags
// - .Y - always 0
// - .A - FAC1 exponent
//
// See also:
// - [CM64] Computes Mapping the Commodore 64 - page 114
// - https://www.c64-wiki.com/wiki/Floating_point_arithmetic
// - https://codebase64.org/doku.php?id=base:kernal_floating_point_mathematics
//