implemented few trivial math routines

2020-01-29 19:18:59 +01:00
1 parent 9de9a6c0a7
commit 2d1d7ee0b4
@@ -0,0 +1,22 @@
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+//
+// Math package - subtract FAC1 from RAM
+//
+// Input:
+// - .A - address low byte
+// - .Y - address high byte
+//
+// See also:
+// - [CM64] Computes Mapping the Commodore 64 - page 112
+// - https://www.c64-wiki.com/wiki/Floating_point_arithmetic
+// - https://codebase64.org/doku.php?id=base:kernal_floating_point_mathematics
+//
+
+FSUB:
+
+	jsr CONUPK
+
+	// FALLTROUGH to FSUBT