## Unpacked BCD to 16 bit binary conversion

```;*******************************************************************************
; Input: unpacked BCD in  tenk:thou:hund:tens:ones
;Output: 16 bit binary in hi:lo
;  Size: 35 instructions
;Timing: 3+34+3=40 instruction cycles
;
; Notes:
;1) if input is higher than 65535 output is meaningless
;2) algorithm synopsis:
;
;> dec2bin([1 10 100 1000 1e4], 16)
;ans =
;0000000000000001
;0000000000001010
;0000000001100100
;0000001111101000
;0010011100010000
;
;Or coded in three levels ('+' represents +1, '-' represents -1):
;000000000000000+ * ones +
;000000000000+0+0 * tens +
;000000000++00+00 * hund +
;00000+0000-0+000 * thou +
;00+0+00-000+0000 * tenk
;
;bin = (((tens+thou+tenk*256)*2+
;	hund+hund*16+thou*256)*2+
;	tens+hund*16-thou*16+tenk*16*256)*2+
;	ones+tenk*16-tenk*256
;
;January 22, 2001 by Nikolai Golovchenko
;*******************************************************************************

dec2bin16
mov	W, tens
mov	lo, W
mov	W, <<tenk
mov	hi, W

mov	W, <>hund
mov	W, thou
rl	lo
rl	hi

mov	W, <>hund
mov	W, <>tenk
snc
or	W, #\$01
mov	W, <>thou
sub	lo, W
sc
dec	hi
clc
rl	lo
rl	hi

mov	W, <>tenk
mov	W, tenk
snc
mov	W, --tenk
sub	hi, W
retp
;*******************************************************************************
```

 file: /Techref/scenix/lib/math/radix/dec2bin16.htm, 1KB, , updated: 2004/6/10 14:40, local time: 2024/9/13 01:19, owner: NG--944, TOP NEW HELP FIND:  44.222.82.133:LOG IN

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