IBM 6643 User Manual
Page 118
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The
IRQ
levels,
DMA
channels,
I/O
address,
and
ROM
and
RAM
addresses
all
become
potential
conflicts
and
system
problems.
When
conflicts
arise,
they
might
show
up
as
system
hangs,
lost
or
missing
devices,
incorrect
or
bad
data,
or
failing
diagnostics.
Always
eliminate
conflicts
in
these
areas
before
replacing
any
hardware
components.
110
Hardware
Maintenance
Manual
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