Convert BCD to Decimal

Hi,
I'm having real problems converting a BCD number to decimal.  I want to do it using assembly coding.  I have tried shifting (shl,shr) the upper 4 and lower 4 bits right out of the number to deal with them on their own.  I found out shifting doesnt work like that (it just adds on a bunch of 0's where you shifted from and keeps the numbers I thought would shift right out of the register ( would be nice to have them dropped out ) ).  
If I have a BCD number in a register (16 or 8 bit) (ie. Get Real Time Clock returns hour in BCD to CH)  how can I properly change it to decimal?

Thanks in advance
bod_1Asked:
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NexialCommented:
Here's how I do it, for the clock:
(a minor snippet)

     DOSCALL @GETTME ; CH<-hours, CL<-minutes
     MOV     AL,CH           ;AL<-binary hours
     AAM                     ;Convert AL to two
     XCHG    AL,AH           ; BCD digits in AX.
     OR      HOUR,AX         ;Fold into hours
     MOV     AL,CL           ;AL<-binary minutes
     AAM                     ;Convert AL to two
     XCHG    AL,AH           ; BCD digits in AX.

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bod_1Author Commented:
Nietod... you're amazing

I haven't got the snippet working yet but youve pointed me towards the right instructions.
Thanks
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