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information are specified, the information is stored in<br />
consecutive locations" even if one or both operands contain<br />
less than four bytes of information, as shown in Example b.<br />
The contents of registers that have been changed using the<br />
SET request are not typed after the request has been issued.<br />
To inspect the contents of these registers, the CAW" CSW.<br />
PSW, or GPR requests are issued as needed. Figure i7<br />
contains examples of issuing these requests both before and<br />
after SET has been issued.<br />
Responses:<br />
If the request is issued correctly" a carriage return is<br />
issued and the keyboard is unlocked to accept another DEBUG<br />
request.<br />
INVALID DEBUG REQUEST<br />
This response indicates that the wrong number of operands<br />
have been specified. If the CAW is set, two operands must be<br />
given. To set the CSW or the PSW, two or three operands are<br />
required. TO set a GPR. three or four operands must be<br />
given.<br />
INVALID ARGUMENT<br />
This message indicates that either<br />
CAW, CSW, PSW or GPR. the first<br />
second operand is not a decimal<br />
inclusive, or one or more of the<br />
contain hexadecimal information.<br />
Examples:<br />
the first operand is not<br />
operand is GPR and the<br />
number between 0 and 15<br />
hexinfo operands does not<br />
a. SET CAW 1100<br />
This example causes the two-bytes 1100 to be placed in the<br />
first, two bytes of the channel address word that existed<br />
when DEBUG was entered. See Figure 18. This new channel<br />
address word is restored when an exit is made from the DEBUG<br />
environment.<br />
h. SET CSW 001 00FF81<br />
Since an uneven number of bytes is specified in the second<br />
operand, a zero is placed in the left-frost half-byte" giving<br />
0001. These two by test, together with the three bytes given<br />
in the third operand are placed as a single five-byte field<br />
into the csw that existed when DEBUG was entered. See<br />
Figure 18. This new channel status word is restored when<br />
leaving the DEBUG environment.<br />
c. SET PSW 01000000 00012036<br />
The contents of the entire program status word for the<br />
interrupt that caused DEBUG to be entered are replaced by<br />
these eight bytes of information. See Figure 18. This PSW<br />
becomes the current psw when an exit is made from the DEBUG<br />
environment.<br />
DEBUG - SET 249
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