MZC1
Issue: 0
Date: October 1988
(with particular reference to MZC-1 card)
42B +5V +5V Power supply Rail
43B +5V +5V Power Supply Rail
These, and 42A and 43a on the other side of the connector form the +5V Power supply Rail. See the description for 42A and 42B for more information.
Derived signal
NINTAK: This signal indicates that the CPU is acknowledging an interrupt and expects an interrupt vector to be placed on the data bus.
The NINTAK signal can be produced as the output of an "or" gate (e.g. 74HC32) which has NIOREQ and NMI(OCF) connected to its inputs. As it can be produced in this way anywhere it is needed there is no need to allocate a bus line to it.