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Vector 4 - Page 93

Vector 4
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VECTOR
GRAPHIC,
INC.
12
D8
23,
24
25
D9
23,
24
-
25
D10
X
D11
5
D12
Parallel
Interface:
A
PPI
(Programmable
Peripheral
Interface-8255)
chip
that
links
the
I/O
System
with
two
types
of
connectors.
EXDans
Jot
_Buffers:
Buffers
for
the
address
lines,
data
lines
and
control
signals
that
go
to/from
the
Expansion
Slots.
Expansion
Slots:
3,
V-100
slots
(for
1/0
only).
.
tem
cister:
A
MSI
chip
(74LS273)
which
decodes
port
31gnals
and
generates
a
variety
control
signals
which
are
used
by
several
SBC
Subsystems.
[/O
Data
Bus
Transceiver:
This
subsystem
consists
of
a
chip
that
is
a
bi-directional
driver
which
controls
the
data
flow
on
the
I/O
Data
Bus.
The
I/0
portion
of
the
Block
Diagram
and
the
SBC
Schematic
is
shown
on
the
next
four
pages.
o
5-2
7200-0001
09-01-82

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