IBM 5100 - Page 360

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GETB oA, Ry, SM (op code E): A data byte is trans·
ferred from
an I/O device designated by oA to a storage
location designated by
the storage address register (Ry).
The data byte
is sent from the device on bus in. The
indirect address in
the storage address register is modified
after
the microinstruction· is executed.
Modifier
0 Plus 1
1 Plus 2
2 Plus 3
3
Plus 4
4 Minus 1
5
_Minus 2
6
Minus 3
7 Minus 4
8,9,A,B
No change
C,o,E,F
This is the GETRB instruction
'Get strobe' and
'op code E' are activated during this
microinstruction
to signal the I/O device that this is a
GETB microinstruction.