IBM System/370 145 Operating Procedures Manual page 52

4
From the following chart, type the appropriate two-
character mnemonic and address of the storage area or
register to be altered or displayed.
STORAGE ALTER DISPLAY ADDRESS
AREA MNEMONIC MNEMONIC RANGE
MAIN STORAGE AM OM 000000-03 F F F F
*
STORAGE KEY AK OK
000000-03 F F F F
*
CONTROL REGISTER
AC
DC O-F
GENERAL
AG OG O-F
REGISTER
FLOATING-POINT
AF OF 0,2,4,6
REGISTER
CURRENT PSW AP
OP None required
STORE STATUS NONE
ST
None required
VIRTUAL STORAGE AV
OV
OOOOOO-FFFFFF
* The upper boundry is movable and depends
upon the capacity of main storage.
5
When zeros are typed to the left of the address, a new
line operation is started automatically. When zeros are
not inserted, press the RETURN key_
I
Operating Procedures 51