This trap accesses the console linkage block and sets bytes in it.

• All registers not mentioned above are unused and preserved.
• The number of bytes in D2.W is set from the address in A1.L to the address D1.W bytes from the start of the console linkage block.
• If D2.W is set to zero, no bytes are sent but the address of the linkage block is still returned in A1.L. This provides a way of accessing the linkage block without altering it.

The example shows how to access the linkage block's address.

con    dc.w   3
       dc.b   'con'

get_ad lea    con,a0       ; To open a window
       moveq  #0,d3
       moveq  #-1,d1       ; This job
       moveq  #io_open,d0
       trap   #2           ; Open the channel
       moveq  #0,d2        ; Send no bytes
       moveq  #$6F         ; IOP.SLNK
       trap   #3           ; sets the address in A1
       moveq  #io_close,d0
       trap   #2           ; close the channel
                           ; The linkage address is now in A1