Table
3-1
MPU
Input/Output
Signal Descriptions
Signal
Description/Function
Signal
Description/Function
D0-07
These
eight
lines are
bi-directional
data
are
loaded
into
the
MPU
program
bus lines.
counter
to
point
the
start
of
a reset
AO-A15 These sixteen lines are
unidirectional
routine.
MPU
address
lines
to
supporting
--
memory
(i.e.,
ROMs, RAMs) and
1/0.
NMI
This
input
line,
while
going
low,
indi-
--
cates a
"non-maskable
interrupt"
to
the
IRQ
This
input,
when
low,
indicates
an
MPU.
After
the
MPU
concludes
its
interrupt
to
the
MPU.
After
th
.e MPU
current
instruction,
it
will
then
proceed
concludes
its
current
instruction
it
will
to
the
NMI
sequence.
proceed
to
the
IRQ sequence.
<t>O
Clock
input
---
RESET
When
low,
this
input
line
resets
the
<1>1,
<1>2
Two-phase,
non-overlapping
MPU
MPU
on
either
a
"power-up
condition"
or
a Q
0
output
of
the
watchdog
counter.
clock
outputs.
-
During
the
reset sequence
prior
to
R/W
This
output
is
the
read and
write
RESET
going
high,
the
contents
of
two
signal
line,
which
indicates the
direction
locations
(FFFC,
FFFD)
in
memory
of
data transfers
on
MPU data bus.
Table 3-2 Atari Inc. Programmed Memory Map
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NOTICE TO ALL PERSONS RECEIVING THIS DRAWING
CONFIDENTIAL: Reproduction forbidden
without
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specific
written
permission
of
Atari, Inc., Sunnyvale,
California. This drawing is only
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confers
or transfers
any right in,
or
license to use, the
subject
matter
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drawing
or
any design
or
technical
information
shown
thereon,
nor
any right to reproduce this drawing or any part
thereof, ex
cept
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porated and for manufacture under the
corporation's
writ·
ten
license
, no right
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