Apple II User Manual

     EXAMPLE:

     25         LD   R5              ;Copy the contents

     36         ST   R6              ;of R5 to R6

LOAD INDIRECT:

     LD @Rn              [ 4n ]

     The low-order ACC byte is loaded from the memory location

     whose address resides in Rn and the high-order ACC byte is

     cleared. Branch conditions reflect the final ACC contents

     which will always be positive and never minus 1. The carry

     is cleared. After the transfer, Rn is incremented by 1.

     EXAMPLE

     15 34 A0   SET  R5   $A034

     45         LD   @R5            ;ACC is loaded from memory

                                    ;location $A034

                                    ;R5 is incr to $A035

STORE INDIRECT:

     ST @Rn              [ 5n ]

     The low-order ACC byte is stored into the memory location

     whose address resides in Rn. Branch conditions reflect the

     2-byte ACC contents. The carry is cleared. After the transfer

     Rn is incremented by 1.

     EXAMPLE:

     15 34 A0   SET  R5   $A034     ;Load pointers R5, R6 with

     16 22 90   SET  R6   $9022     ;$A034 and $9022

     45         LD   @R5            ;Move byte from $A034 to $9022

     56         ST   @R6            ;Both ptrs are incremented

LOAD DOUBLE-BYTE INDIRECT:

     LDD @Rn             [ 6n ]

     The low order ACC byte is loaded from memory location whose

     address resides in Rn, and Rn is then incremented by 1. The

     high order ACC byte is loaded from the memory location whose

     address resides in the incremented Rn, and Rn is again

     incremented by 1. Branch conditions reflect the final ACC

     contents. The carry is cleared.

     EXAMPLE:

     15 34 A0   SET  R5   $A034     ;The low-order ACC byte is loaded

     65         LDD  @R6            ;from $A034, high-order from

                                    ;$A035, R5 is incr to $A036