VECTOR
GRAPmC,
INC.
Modem
04H
(Data)
05H
(Status/Control)
Parallel
Ports
- One
8255
programmable I/O chip (with supplementary decoder
chips) is used
to
interface with parallel printers using
either
a
Centronics
or
NEC/Qume protocol.
Port
A
Port
B
Port
C
Control
Port
08H
09H-
OAH
OBH
Other
Ports
-
Other
ports
are
used
for
the
programmable
timer,
video
controller, tone generator and
to
set
various subsystem parameters.
ROM
Enable (and color)
CPU Swap
Video Controller
Timer
RAM
Address
Map
Tone Generator
Color
Map
02H
03H
OCH
ODH
OEH
OFH
10H (Timer
0)
11H
(Timer 1)
I2H (Timer
2)
I3H (Control)
I6H
I7H
18H
19H
ICH
IDH
1EH
IFH
Expansion
Slots
- Two
modified
S-100
expansion
slots
are
available
for
additional boards. Since the main system uses a
Switching
Regulated
Power
Supply these boards must not have on-board regulation.
CLOCK
SIGNALS
A 32.640
MHz
oscillator generates a signal which is used directly
by
the
Video
(Dot Clock) and other subsystems.
X
A-2
7100-0001
9-1-82 - Rev. A
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