IBM 1 Series - Teletypewriter Adapter Physical Characteristics; Physical Description; Signal Pin Assignments

Teletypewriter Adapter Physical Characteristics
Physical Description
Signal Pin Assignments
The teletypewriter adapter is a standard IBM printed circuit card with two
signal planes. (For an illustration of the card, see ‘I/O Channel Physical
Components Description” in Chapter 2.) Four connectors on the card plug
into a backpanel board that distributes the processor I/O channel signal
lines. There is a 16-pin (2 x 8) connector at the top of the card for device
inputs and outputs.
The cable that plugs into this connector should be made with #24 AWG
wire, and must use Berg part number 75598-003 pins (or equivalent) and
a Berg part number 65405-005 housing (or equivalent).
Figure 4-9 shows the cable connections for the teletypewriter adapter card.
The following table is a list of the signals and their pin assignments:
Pm Signal Pin Signal
Al Isolated receive input+ Bl Nonisolated receive input-
A2 Current driver, current B2 (Polarizing pin)
=mark
A3 Isolated receive input- B3 Current driver, current=
or nonisolated receive space
input+
A4_ EIA received data in B4 TTL received data in
A5 Frame ground BS Signal ground
A6_ EIA data terminal ready B6 EIA transmitted data
A7 SSS closed=data mark B7 SSS open=data mark or
or -TTL data out +TTL data out
A8& SSS/TTL write control B8 SSS/TTL read control
Teletypewriter adapter card
N
\ AB
O}/O] 8g
/ O}O} 7
O}O} 6
O!}O] 5
O!|O]} 4
. 0/0] 3
~ 0
User-supplied olo '
2X8
connector Pin view
Figure 4-9. Cable connections for the teletypewriter adapter card
Teletypewriter Adapter Feature 429