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SX Microcontroller Radix Math Method

Parsing the radix from "B" for binary, etc..

;by James Newton and Nikolai Golovchenko

;Enter with an ASCII character representing the desired base for a radix conversion. 
;B=Binary
;D=Decimal
;H=Hex
;O=Octal
;
;Challenge 1: exit with a different bit set for each base.
;Challenge 2: exit with the radix (2 for binary, 10 for decimal, 16 for hex, 8 for octal)
;Challenge 3: exit with a jump table index
;
;My best:

	Radix		ds 1	;radix to change data from
RadixBin	=	Radix.1	;B  01000011
RadixOct	=	Radix.4	;O  01010000
RadixDec	=	Radix.2	;D  01000101
RadixHex	=	Radix.3	;H  01001001

Answer1
	inc	radix	;B=3,D=5,H=9,N=15,O=16
;done
	jb	radix.0, binary
	jb	radix.1, decimal
	jb	radix.2, hex
	jb	radix.3, octal

Answer2
	inc	radix
	clrb	radix.6	;B=3,D=5,H=9,O=16
	sb	radix.2	;if not D (5)
	 dec	radix	;B=2,D=5,H=8,O=15
	snb	radix.1	;if D or H
	 rl	radix	;B=2,D=11,H=17,O=15
	clrb	radix.0	;B=2,D=10,H=16,O=14
	snb	radix.2	;if O
	 clrb	radix.1	;B=2,D=10,H=16,O=12
	clrb	radix.2	;B=2,D=10,H=16,O=8

;or...
	
	inc	radix
	mov	w, #2
	snb	RadixOct
	 mov	w, #8
	snb	radixDec
	 mov	w, #10
	snb	radixHex
	 mov	w, #16

;and if you want to handle N = nibble

	inc	radix
	mov	w, #8
	snb	radixDec
	 mov	w, #5		;D or N
	snb	radixHex
	 mov	w, #16	;H
	snb	radixBin
	 mov	w, #2		;B or N
	snb	radixDec
	 rl	radix	
;if both .0 and .1 were set radix = 4
;if only .1 was set radix = 10

Answer3
	clrb	radix.6
	dec	radix	;B=2,D=5,H=8,O=15
	clc
	rr	radix	;B=1,D=2,H=4,O=7
	dec	radix	;B=0,D=1,H=3,O=6
	clb	radix.2	;B=0,D=1,H=3,O=2

See also:


file: /Techref/scenix/lib/math/radix/parseradix-jn_sx.htm, 1KB, , updated: 2004/6/10 13:40, local time: 2019/12/9 10:49,
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