UN23/555
UN23/568
UN23/569
UN23/570
UN23/571
UN23/573
UN23/574
UN23/575
UN23/577
UN23/578
UN23/579
- 417
UN23
DD 1972. CANCELLED.
Logic Pulse Decoder Unit, used in CD3M/515 to generate
timing pulses from the output signal of OSl/520. Printed
circuit board with 33 way connector. Indexing positions
15, 17, 31. RD 1972. OBSOLESCENT.
Sync Decoder and Changeover Unit, used in CD2M/508 to
accept main and standby feeds of synchronising pulses and
to select the standby feed if the main feed fails.
Printed circuit board with 33 way connector. Indexing
positions 23, 27, 31. RD 1972. OBSOLESCENT.
Reader Logic Unit, used in EPlM/528 to provide the "stop",
"start" and "direction" signals for the paper tape reader
used as the
data
input
device.
Double
sided
printed
circuit board, 254mm x 203mm with 71 way edge connector.
DD 1972. OBSOLESCENT.
Arithmetic Logic Unit, used in EPlM/528 to receive binary
coded data from the paper tape reader and produce the
necessary output signals for the 'transmit', 'override'
and 'up date' modes of working. Double sided printed
circuit board 254mm x 203mm, with 71 way edge connector.
DD 1972. OBSOLESCENT.
Sample and Hold Logic Unit, used in CD2M/508 to sample
audio input signals and measure durations of the samples.
Printed circuit board with 33 way ISEP connector.
Indexing positions 3, 23, 31. RD 1972. OBSOLESCENT.
Shift Register Logic Unit, used in CD2M/508 to convert 9
bit parallel input signals to a serial output signal.
Printed circuit board, lllmm x 225mm, with 33 way ISEP
connector. Indexing positions 5, 13, 19. RD 1972.
OBSOLESCENT.
Pulse Decoder Logic Unit used in CD2M/508 to generate
timing pulses from the output signal of OSl/520 and to
generate 5MHz clock pulses from UN23/574. Printed circuit
board with 33 way ISEP connector. Indexing positions 11,
21, 27. RD 1972. OBSOLESCENT.
Shift Register Logic Unit, used in CD3M/5l5
18 bit serially coded data signal into 9 bit
signals. Printed circuit board with
connector. Indexing positions 11, 13,
OBSOLESCENT.
to convert an
parallel data
33 way ISEP
27. RD 1972.
Pulse Decoder Logic Unit, used in CD3M/515 to generate
timing pulses from the output signal of OSl/520. Printed
circuit board, 11lmm x 225mm with 33 way ISEP connector.
Indexing positions 13, 23, 27. RD 1972. OBSOLESCENT.
Logic Punch Unit, provides control logic for paper tape
punch used with EPlM/528. Printed circuit board.
DD 1972. OBSOLESCENT.

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