Specifications

UNIBUS MODULE (M920)-The M920 is a double module which connects
the Unibus from one System Unit to the next within a Mounting Box. The
printed circuit cards are separated ‘by 1”
for this-purpose. A single M920
will carry all 56 Unibus signals .and 14 grounds.
UNIBUS CABLE (BCllA)-The BCllA is a 120~conductor flexprint cable used
to connect System Units in .different mounting boxes or a peripheral device
which is removed from the mounting boxes.
The 120 signals consist of the 56 Unibus lines plus 64 grounds., Signals and +
grou,nds alternate to minimize cross talk.
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BCl lA-2. 2’
BCllA-5 5’
BCllA-BA 8’6”
BCllA-10 10’
BCl l A-15 15‘
BCl lA-25 25’
CABLE REQUIREMENTS
When an Extension Mounting Box is used, an external cable, the @CIlA, is
the only signal.conn@ion between mounting boxes. This external bus cable
may also be. used to connect other peripherals to the PDP11. The maximum
combined, internal and external, bus cable.length is 50’.
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’ PDP-11/20 POWER REQUlkEMENTS
/
Input Voltage and Current-105-125 Vat, 6 amperes, 210-260 Vat 3 am-
peres, (single phase)
Line Frequency47-63 Hz
Pdwer Dissipation400 watts
d
A standard 15-foot, 3-prong,- U-ground, 15-ampere, line cord is provided on
the rear of the PDP-11 for connection to the power source on 120 Vat
models. On 230 Vat models, a 15-foot, S-conductor cable with pigtails is
provided.
TELETYPE REQUIREMENTS
The standard Teletype requires a floor space approximately 221/2 inches
wide by 181/s inches deep. The Teletype cable length restricts its location to
within 8 feet of the si#e of the computer.
Input Voltage-115 Vat *lo%, 60 Hz kO.45 Hz, 230 Vat *lo%, 50 Hz
-CO.75 Hz
Line Current Drainl2.0 amperes
Power Dissipation-150 watts
The Teletype plugs into the rear of the PDP-11 Basic Mounting Box and is ’
turned ON and OFF by the~eower s,witch on the front panel of the PDP-11.
ENVIRONMENTAL REQUIREMENTS
The PDP-11 is designed to operate from +lO to +5O”C and with a relative
humidity of from 20 to 95% (without condensation).
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