DRL T.CMOV (octal 73) - read/write memory.

Usage:

drl     t.cmov
zero    frblk,p#
zero    toblk,n
tze     alwell          return to here

Where:

frblk: is the address of the area you wish to snap.
toblk: points to the buffer which will receive the data.
n: is the number of words to be moved (snapped).
p#: is number of the program you wish to snap.

Description:

DRL T.CMOV is used to read/write system memory from TSS. Use of this derail is restricted to users with a CARDIN bit (privileged users) or to privileged subsystems in the command library.

The write function is restricted to master subsystems.

Conditions and restrictions

If "p#" is zero, "frblk" is taken as an absolute address. If "p#" is -1, the data is to be written, rather than read, and "frblk" is taken to be within TSS' memory (program number five). Otherwise, "p#" is taken to be relative to the lower address limit for that program number.

The addresses from "toblk" to "toblk+n+1" must be relative to and within the caller's memory.

On successful return, the A register contains the contents of the word at "frblk", the Q register contains zero, and the zero indicator is on. On unsuccessful return, the A register is unchanged, the Q register contains an error code in the lower half, and the zero indicator is off.

The possible error codes and their explanations are as follows.

1 error, address outside prog specified
2 error, address out of range
3 program not in core
4 error in write call
5 permissions denied
6 n > 1024
7 no such p#