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--- makesin [2013/01/10 21:32] – darkbyte
+++ makesin [2017/02/16 13:34] (current) – darkbyte
@@ Line 1: / Line 1: @@
-==== makesin (fast, approximated) ====
+====Sinus table generators====
-//fast generator via approximation of x^2 parabola//
+----
+**__makesin (fast, approximated)__**
 <code z80>
+;fast generator via approximation of x^2 parabola
+;Copyright © 2012 Busy, optimized by Zilogat0r
 mksin:    ld    bc,sintab
           ld    d,c
@@ Line 30: / Line 36: @@
 sintab:   ds    256
 </code>
-Copyright © 2012 Busy, optimized by Zilogat0r
-Navigation: [[general]] . [[math]] . [[graphic]] . [[sound]] . [[system]] . [[other]] . back to [[start]]
+----
+**__makesin (alternative)__**
+<code z80>
+; sinus	maker. {C} Jordan of exodus
+; a: amplitude,	c: offset, hl: adr
+; WARNING!!
+;	org  xx00h
+mksnt	exx
+    	ld   c,a
+    	ld   b,01h
+    	ld   hl,sintabb
+    	exx
+    	ld   e,00h
+    	call h800e
+    	dec  e
+h800e	call h8011
+h8011	ld   b,40h
+h8013	exx
+    	ld   e,(hl)
+    	inc  l
+    	ld   d,(hl)
+    	ld   a,l
+    	add  a,b
+    	ld   l,a
+    	ld   a,c
+    	srl  a
+    	srl  e
+    	jr   nc,h8022
+    	add  a,c
+h8022	srl  a
+    	srl  e
+    	jr   nc,h8029
+    	add  a,c
+h8029	srl  a
+    	srl  e
+    	jr   nc,h8030
+    	add  a,c
+h8030	srl  a
+    	srl  e
+    	jr   nc,h8037
+    	add  a,c
+h8037	srl  a
+    	srl  e
+    	jr   nc,h803e
+    	add  a,c
+h803e	srl  a
+    	srl  e
+    	jr   nc,h8045
+    	add  a,c
+h8045	srl  a
+    	srl  e
+    	jr   nc,h804c
+    	add  a,c
+h804c	srl  a
+    	srl  e
+    	jr   nc,h8053
+    	add  a,c
+h8053	srl  a
+    	srl  d
+    	jr   nc,h805a
+    	add  a,c
+h805a	srl  a
+    	srl  d
+    	jr   nc,h8061
+    	add  a,c
+h8061	srl  a
+    	srl  d
+    	jr   nc,h8068
+    	add  a,c
+h8068	srl  a
+    	adc  a,d
+    	exx
+    	xor  e
+    	jp   p,h8071
+    	inc  a
+h8071	add  a,c
+    	ld   (hl),a
+    	inc  l
+    	djnz h8013
+    	exx
+    	ld   a,b
+    	xor  0fch
+    	ld   b,a
+    	exx
+    	ret
+sintabb:
+    	db   00h,00h,32h,00h
+    	db   64h,00h,97h,00h
+    	db   0c9h,00h,0fbh,00h
+    	db   2dh,01h
+    	db   5eh,01h,90h,01h
+    	db   0c1h,01h,0f2h,01h
+    	db   22h,02h,53h,02h
+    	db   82h,02h
+    	db   0b2h,02h,0e1h,02h
+    	db   10h,03h,3eh,03h
+    	db   6ch,03h,99h,03h
+    	db   0c5h,03h
+    	db   0f1h,03h,1dh,04h
+    	db   48h,04h,72h,04h
+    	db   9bh,04h,0c4h,04h
+    	db   0ech,04h
+    	db   13h,05h,3ah,05h
+    	db   5fh,05h,84h,05h
+    	db   0a8h,05h,0cbh,05h
+    	db   0edh,05h
+    	db   0fh,06h,2fh,06h
+    	db   4fh,06h,6dh,06h
+    	db   8ah,06h,0a7h,06h
+    	db   0c2h,06h
+    	db   0ddh,06h,0f6h,06h
+    	db   0eh,07h,25h,07h
+    	db   3bh,07h,50h,07h
+    	db   64h,07h
+    	db   77h,07h,88h,07h
+    	db   99h,07h,0a8h,07h
+    	db   0b6h,07h,0c3h,07h
+    	db   0ceh,07h
+    	db   0d9h,07h,0e2h,07h
+    	db   0eah,07h,0f1h,07h
+    	db   0f6h,07h,0fah,07h
+    	db   0feh,07h
+    	db   0ffh,07h,0ffh,07h
+</code>
+----
+**Navigation: [[general]] . [[math]] . [[graphic]] . [[sound]] . [[system]] . [[other]] . back to [[start]]**