UN2l
UN2l/518
UN22/1
UN22/1A
- 412 -
OBSOLESCENT.
Video Relay Unit for general use. Similar to
but with two printed wiring boards in CH1/26B.
OBSOLESCENT.
UN21L/506
SCPD 1971.
UN22 OVEN UNITS
Oven Unit, incorporating MD3/2, used with UN1/78 to
replace UN1/34, MD3/1A and UN1/33 in EP7/4, EP7/4A to
convert to EP7/7, EP7/7A for stereophonic working.
CHl/12B, pegs 13, 28. DD 1966. DD Spec 5.135. ACO.
OBSOLESCENT.
UN1/34 modified to be electrically similar to UN22/1.
CH1/12B. DD 1967. OBSOLESCENT.
==========================================================================
UN22 Sub Group not available for new designs. DD 1977.
UN23/l
UN23/2
UN23/3
UN23/4
UN23/5
UN23/6
UN23!7
UN23/8
UN23 CONTROL LOGIC UNITS
DD 1967/69. CANCELLED.
DD 1967/69. CANCELLED.
DD 1967/69. CANCELLED.
Shift Register Logic Unit comprising 8 bit shift register
and 8 bit decoder. BBC/ISEP board with 33 way connector,
pegs 3, 5, 9. DD 1967/69. CANCELLED.
Parity Check Logic Unit used in the receiving terminal
equipment of a digital switching system to check the
presence of errors in signals. BBC/ISEP board with 33 way
connector, pegs 3, 5, 15. DD 1967/69. CANCELLED.
Decoder Drive Logic Unit used to take inputs from UN23/4
and drive a number of UN23/7. BBC/ISEP board with 33 way
connector, pegs 3, 5, 11. DD 1967/69. CANCELLED.
Decoder Logic Unit used in the receiving terminal
equipment of a digital switching system to detect the
presence of a unique digital 'word' corresponding to a
particular switching operation. BBC/ISEP board with 33
way connector, pegs 3, 7, 9. DD 1967/69. CANCELLED.
Generator Logic Unit used in the sending end equipment of
a digital switching system to generate a 24 bit word of
variable
content, selected
externally.
BBC/ISEP
board

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