IBM Series 1 User Manual page 126

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USER'S A TI ACHMENT
Isolated receive input
+
or
Non-isolated receive input -
EIA received data in
TIL received data in
Signal ground
SSS closed
=
data mark or
- TIL data out
SSS open
=
data mark or
+
TIL data out
EIA transmitted data
EIA data terminal ready
SSS/TTL write control
SSS/TIL read control
Current driver,
current = mark
Current driver,
current
=
space
Frame ground
ABBREVIATIONS
TIL = transistor-transistor logic
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EIA
=
Electronic Industries Association
SSS solid state switch
+: IPL
=
initial program load
I
W
~
-
Receivers
and
Drivers
~
,...,
\, ,
TELETYPEWRITER ADAPTER FEATURE
Receive
data
~
register
v
Drivers
and
Receivers
Transmit
A
data
It
register
'f
Command
l;t-
decode
I'r-
1\
Drivers
\ and
---~~
v Receivers
Address Vt---
decode
r--
Address
IPL
Primary/
jumpers
control
alternate
(8) jumpers
I/O CHANNEL
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, Data bus
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....
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Address bus
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Cycle steal status bus
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