Assembling

[Mike Turner/ENGR/HQ/KEMET/US]

See insertions below.




"Bruce" <nacelp at bright.net>@diy-efi.org on 08/27/2000 11:46:22 AM

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cc:
Subject:  Assembling



I keep getting numerous:
Invalid Opcode / Psuedo-Op  error messages.

In the following if get that error code for BD, D6, 3D, 05, and 25.   I'm
missing something, but just don't understand what.

LC7C2: BD FC00 ;    JSR    LKUP2DAF
;The BD FC00 is the hex output of the assembler for the JSR LKUP2DAF. The
BD FC00 should ;not be reassembled. Ditto the next 3 lines.
             D6 A4      ;    LDA B  AECOOLF
;D6 A4 is a load direct accumulator a from address A4.
             3D           ;     MUL
;3D is the output of the assembler for the multiply instruction.
             05            ;     ASL D
; 25 04 is the output of the assmelber for the branch on carry set. The
target address
; is 4 bytes beyond the 2405.
      25 04(37CF)   ;     BCS    LV8AE3

And what does the (37CF), mean?
; The 37cf is the target address of the branch instruction. The BCS will
goto address 37cf for the next instruction.

TIA
Bruce




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