14.
Do
not
allow anything
to
rest on AC power cord.
15.
Unplug AC power cord from
outlet
before cleaning
computer
system.
12.
Never expose the
computer
system
to
water. If exposed
to
water
turn the
unit
Off. Do not place the
computer
system
near
possible
water sources.
MREC Memory Request
MUX
Multiplex
OUT
Output
RAM Random Access Memory
RAS Row Address Strobe
RD
Read
ROM
•.............................
Read
Only
Memory
ROM B Read Only Memory B
SHIFT
Shift
SyNC
Sync
SYSRES System Reset
TEST Test
VCLR Vertical Clear
VORV Vertical Drive
VIO
Video
WAIT Wait
WR
Write
ZOO
Thru
Z07
ZIORC
ZMREC
ZRO
ZWR
SAFETY PRECAUTIONS
1.
Use an
isolation
transformer
for
servicing.
2.
Maintain AC line voltage at rated input.
3.
Remove AC power from the
computer
system before servicing
or
installing
electrostatically
sensitive devices. Examples
of
typical
ES
devices are integrated
circuits
and
semiconductor
"chip"
components.
4.
Use extreme
caution
when handling the printed
circuit
boards. Some
semiconductor
devices can be damaged easily by
static
electricity.
Drain
off
any
electrostatic
charge on
your
body by
touching
a known earth ground. Wear a commercial-
ly available
discharging
wrist
strap device. This should be removed
prior
to
applying power
to
the
unit
under test.
5.
Use a grounded-tip, low voltage soldering iron.
6.
Use an
isolation
(times
10)
probe on scope.
7.
Do
not
remove
or
install
boards, floppy
disk
drives, printers,
or
other
peripherals
with
computer
system
AC
power On.
8.
Do
not
use freon·propelled sprays. These can generate
electrical
charges
sufficient
to
damage
semiconductor
devices.
9. Periodically examine the AC power cord
for
damaged
or
cracked insulation.
10.
The
computer
system
cabinet is equipped
with
vents
to
prevent heat build-up. Never block, cover,
or
obstruct
these
vents.
11.
Instructions
should be given, especially
to
children, that
objects
should
not
be dropped or pushed
into
the vents
of
the
cabinet. This could cause
shock
or equipment damage.
::D
:J>
13.
Never leave the
computer
system unattended or plugged
into
the AC
outlet
for
long periods of time. Remove AC plug
3:
C
from AC
outlet
during
lightning
storms. g0
men
'::x:
-:J>
'0
m"
~-1
16.
Never use
liquids
or
aerosols
directly
on the
computer
system. Spray on
cloth
and then apply
to
the
computer
system,
::D
cabinet. Make sure the
computer
system is
disconnected
from
the AC power line. =
~
o
LINE DEFINITIONS
AO
Thru A
15
Address Lines
BIT
0 Thru BIT 7
CAS Column Address Strobe
CHAIN
CLOCK
Clock
CTR
Counter
DO
Thru 07 Data Lines
ENABLE Enable
HALT Halt
HORV Horizontal Drive
HI High
IN
Input
INT Interrupt
INTAK Interrupt Acknowledge
IORC
1npuUOutput Request
KRO
Thru KR7 Keyboard Row Lines
KYBO Keyboard
L1,
L2,
L4,
La
LATCH Latch
LBO
Thru LB5
MOO
Thru
M07
Memory Data Lines
MI
MOOSEL . . . . . . . . . .
..
. Mode Select
Any Bar above any alphabetical
or
numerical
combination
indicates line active in a low
(0)
state.
19
To Next Page
Loading...
Need help?
General
