A-Register Display Roller Switch - IBM System/370 145 Operating Procedures Manual

A-REGISTER DISPLAY ROLLER SWITCH
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The A-REGISTER DISPLAY roller switch is used with the
STORAGE SELECT switch to display the following.
INFORMATION DISPLAYED
ROLLER POSITION
Byte 0 Byte 1 Byte 2
1
Storage or External Register (Store Select Sw)
2* TI-Register T A-Register
TT-Register
3* S-Register P-Register T-Register
4* System Register Bytes 0, 1, and 2
Byte 3
TE-Register
L-Register
H-Register
A REGISTER DISPLAY
1 STORAGE/EXT REGS
2 DOCUMENTARY CNSL
3 S,P, T, L REGISTERS
4 SYSTEM AEGISTER
5 CHAN INTERFACE
6 CHAN WORD A
7 CHANWORDO
8 (UAN WORD C
5* MPX Channel Registers or Selector Channel External Word GTAG
6* Channel Word A (External Word GSTAT)
7* Channel Word B (External Word GBS)
8*
Channel Word C (External Word GBUF)
Position 1 is described in the Store/Display section of this
manual.
*Positions 2 through 8 are for service use.
When the CPU is in a soft-stopped state (MANUAL indi-
cator on), the indicators display the next instruction
address.
Console I ndicators, Switches, and Keys 13