buttons or up to four sets of BCD coded thumbwheel switches
together with a momentary interrupt for the first twelve
selections. Latched outputs are provided to indicate the
selection in individual form or to drive seven segment
displays. Power requirements +5V. 4U BMM unsupported card
with PN1/29J front panel. Parent Equipment CD2L/518. DD
1977. DDMI 8.599(79).
Interpolation Control Logic Unit to control the digital
multipliers, UN26/535 in the field store standards
converter to produce temporal and spatial interpolation.
equipment C06/510. DD 1978.
Main Computer Interface. Microprocessor interface board
for connecting Ceefax magazine source computer into the
Ceefax microprocessor based CVI. This initial version for
CAI computers. A second version may be produced to suite a
DEC PDP-II computer. Power requirements +5V. PN1/29J. RD
Subtitle Interface. Microprocessor interface board for
connecting input from subtitle computer into the Ceefax
microprocessor based CVI. Power requirements +5V.
PN1/29J. RD 1978.
Output Timing Logic obtains data by direct memory access to
microprocessor memory, serialises data and outputs it
during field internal data lines. Function set by fusible
link read only memories to operate according to Ceefax
specification. Power requirements +5V. PN1/29J. RD 1978.
Decision Logic Unit. The unit accepts information
regarding the sync level, chrominance level and noise of
two video signals and generates a decision command to video
matrix SE3/504. Power requirements +12V, -12V. CH1/64A.
Parent equipment SE1M/501. DD 1978.
Decision Logic Unit. As UN23/662 but with revised panel
requirements +12V, -12V. DD 1980.
Printer Control Logic. It is driven from a teletext
decoder via a pulse processing unit UN2/545. It contains
the operation of a matrix printer to provide hard copy of a
teletext page. Power requirements +12V +5V -5V.
305mm x 127mm printed circuit board. DD 1978.
Interface Logic Unit. Interface and latch board for
MA2M/505 incorporating inter-field cut. BMM 4U unsupported
printed circuit board. SCPD 1979.
Logic Unit. Part of SE3L/505, This unit contains
for control panel switches and waveform selection
4U 'J' size printed circuit board with panel.
equipment SE3L/505. DD 1979. DDMI 8.622(80).
Address Control Card. The unit processes read and
address signals in the C06/510 field stores.