Control Panel
9 - 3
CTC Counter-timer chip U5 provides several functions for the processor.
Counters in the CTC let the processor time internal events. The CTC
receives interrupt requests from UART U10, and controls interrupts to
the processor.
UART Universal Asynchronous Receiver Transmitter (UART) U10, serially
communicates with the Main Unit. The UART converts parallel data
bus information into serial information. Data sent from the Control
Panel to the console is formatted and transmitted by the UART. Data
from the main unit is received by the UART, is converted to parallel
format, and interrupts the CPU to signal that data is present in the
receive holding register.
Line Drivers Level converting driver U20 changes the UART 0 and 5 VDC trans-
mission signals into ±10 VDC. These signals are then compatible with
the RS-232C communication standard.
Line Receivers Level converting receivers in U20 change incoming RS-232C signals (
±10 VDC) into 0 and 5 VDC signals, respectively. These signals are
then compatible with the UART, and can be assembled for the proces
-
sor.
Display Decoder Display driver U4 interfaces with the Display Card. U4 receives the
address and control buses from the processor, an enable line from
decoder U12, and provides enable strobes to the 4 display drivers on
the Display Card.
Bus Buffers Bus signals transmitted from the processor to the Display Card are
buffered by U3 and U7.
PIO Output Buffer Logic inverter U1 buffers the A5-A7 PIO outputs.
Ferrite Beads Ferrite Beads FB1-FB11 are used to suppress noise transmitted from
the power source. The beads are also used on transmit receive lines
for U20.
Wait State Controller Cards utilize the Intel D82C284-8 clock generator, which
will not support wait state, and new generation MAXIM and HARRIS
display drivers which do not require wait-state support.
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