R1 contains the address of a 4-word parameter list
The input parameter
list is:
- The first word contains the virtual address of any byte in the page to start looking at
- The second word contains the maximum number of pages to process
- The third and fourth words contain the 8-byte STOKEN for the data space to be examined.
The output parameter list for IARQDSPD is: 
- The first word remains unchanged
- The second word contains the address of the delimiter page
- The third and fourth words remain unchanged.