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Hardware Structure of the CDS _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 49
Depressing RUN U should cause the RUN in-
dicator to light. If it does not, the problem may be a
failure in the control module, no CLOCK signal, a
burned-out indicator, or a failed CPU.
Another common problem is data bus contention
caused by enabling user-inserted I/O devices or
memory onto the data bus at the wrong time. In
parti<;ular, if extra memory modules have been ad-
ded,
check
that they are wired to the correct Memory
Bank Select signal.
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So long as CLOCK and dc power (VDD and
CPUPWR) are present at the CPU module, then
TPA and TPB should also be present unless CLEAR-
Nor WAIT-N is asserted.
Pressing LF or CR after RUNU should cause
UT20 to calibrate itself and type out a prompting
asterisk. If the CDS does not respond to UT20
commands, then locating the source of trouble is
beyond the scope of this Manual. In particular, the
troubleshooting of user-designed interfaces is an art.
Hardware Specifications
NEST
19" rack mount, 5.25" high, 10" deep.
32 card positions
(7
occupied by power supply).
Connectors with plastic guides. -
44 pins; 0.156" pin spacing; wire-wrap pins
O.
5"·
connector spacing
PANEL
Hinged at left; knob provided to latch panel.
Seven switches
POWER ON
RESET
RUNP
RUNU
LOAD
SINGLE STEP or CONTINUOUS
BUS or LAST I/O BYTE DISPLAY
Six Hex Digit Displays for MEM ADD and
BUS/I/O
Six LED Indicators:
RUN
Q
SCO
SCI
WAIT
CLEAR
Line cord and socket at back of cage .
POWER SUPPLY
Mounted to slotted rear of nest, uses space of 7
connectors.
+5 volts at 6.0 amperes; 5% regulation
-5 volts at 0.5 ampere; 5% regulation
+
12 volts at 0.5 ampere; 5% regulation
Short circuit and thermal protection.
One fuse for AC, on front panel.
(no overvoltage protection)
CABLING
AC power
cord
(8
feet)
Power supply to Panel:
+5 volts for lamp, ground
Power to control module connector:
Flat cable, 50-pin for interfacing display logic
and control switches
Terminal module to (customer furnished) TTY:
Six-wire cable (15 feet)
terminated with MOLEX connectors for TTY
Cable from terminal module to terminal using EIA
interface:
15 feet of six-wire cable to 25-pin Cinch plug.
- These
connections
have unusual sized pins-
.015"
x
.041".
For wiring, equipment such as OK Machine
(Bronx,
N.Y.)
electric-powered wire-wrapping tool Model EW 7D or Model G-lOO with bit WB2644M
and
sleeve P3032LN, or equiva-
lent, should be used. Cards inserted in these connectors should have beveled edges to avoid deforming the contacts.
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