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PROCESSOR TECHNOLOGY CORPORATION
8KRA STATIC READ/WRITE MEMORY MODULE
SECTION IV
pin 23 of IC76 will go low on the first high-to-low transition of 02
after PSYNC.
With two wait states selected (W-to-2 jumper in), pin
12 of IC76 will go low after the second high-to-low transition of 02
after PSYNC.
Inversion in IC76 drives the PRDY bus line high in
either case to send a "ready" signal to the processor.
4.5
POWER SUPPLY
IC76 and IC66 are series voltage regulators that supply on-
card regulation to maintain the constant 5 V de outputs. Input bypass
capacitor (C21) provides additional filtering of the 8 V de input,
and the output bypass capacitors (C22 and C23) improve transient re
sponse by attenuating transients.
Diode D2 is a protective shunt that prevents damage to the
8KRA if it is plugged into the computer backwards.
Dl and limiting
resistor R1 permit the standby battery supply (if used) to continu
ously charge during normal operation.
Should there be a power loss,
and the standby power supply is connected, D3 and D4 conduct to make
battery power available to the 8 ERA.
Under normal operating condi
tions, D3 and D4 isolate the standby supply from +5 V de.
IV-4
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