Editing Intel 8008 (section)

===Code example 2===
The following 8008 assembly source code is for a simplified subroutine named MEMCPY2 that copies a block of data bytes from one location to another. By reducing the byte counter to 8 bits, there is enough room to load all the subroutine parameters into the 8008's register file.
<!--This routine was assembled by brain and might contain errors-->
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<pre>
                   
                   
                   
                   
                   
                   
                   
                   
    
002000  307    
002001  206 015 004
002004  370        
002005  206 015 004
002010  021        
002011  110 000 004
002014  007        
        
          
002015  316
002016  364        
002017  341        
002020  315
002021  353        
002022  331
002023  040
002024  013 
002025  030 
002026  007        
002027             
</pre>
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<syntaxhighlight lang="nasm">
; MEMCPY2 --
; Copy a block of memory from one location to another
;
; Entry parameters in registers
;       HL: 14-bit address of source data block
;       DE: 14-bit address of target data block
;       C: 8-bit count of bytes to copy. (1 to 256 bytes)
 
            ORG     2000Q       ;Code at 002000q
MEMCPY2     LAM                 ;Read source byte into A
            CAL     XCHGI       ;Exchange HL<->DE and increment DE
            LMA                 ;Save A to target byte
            CAL     XCHGI       ;Exchange HL<->DE and increment DE
            DCC                 ;Decrement byte counter
            JFZ     MEMCPY2     ;Continue for all bytes
            RET
            
;Exchange DE and HL register pairs then increment DE as 16 bits
XCHGI       LBL                 ;Exchange L and E
            LLE
            LEB
            LBH                 ;Exchange H and D
            LHD
            LDB
            INE                 ;Inc E, low byte of DE
            RFZ                 ;Return if no carry
            IND                 ;Otherwise inc high byte D
            RET
            END
</syntaxhighlight>
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