Star Tech Journal
Issue: 1983-June - Vol 5 Issue 4 - Page 17
17
STAR*TECH JOURNAL/JUNE 1983
DISPLAY CONTROL DIAGRAM
&~tk
1 K X 3
tape deck will pause again. During the tape
deck pause, the data is being verified. If the
data is correct, the data counter will decrement
by one, and the next block of data will be read
This will continue until the data counter reaches
001. At 001 the CPU will issue a rewind
command to the tape controller, and the cassette
deck will begin to rewind the cassette tape. The
tape will rewind for about 1 minute. The tape
will stop rewinding when the clear leader
portion of the tape is sensed. After the loading
process has taken place, the CPU then begins
to initiate the game program. The game is now
ready for play. The cassette loading process
will take place daily upon power up.
Beginning of Tape
THEORY OF OPERATION
When power is initially turned on, the system
CPU clears the display RAM and prints Deco
Cassette System. At this point, the CPU issues
a rewind command to the tape controller. The
tape will rewind and stop at the clear leader
portion of the cassette tape. The tape deck has
a light sensor circuit (see photos at right). It
consists of a photo sensor and a light-emitting
diode. When light from the LED passes through
the clear leader of the tape, the photo sensor
will detect it, and send a signal to the tape
controller CPU. The tape will then advance
until it reaches the beginning of tape (B.O.T.).
The tape deck will then pause. The B.O.T. is a
small hole in the cassette tape. The tape will
advance, and data will begin to be transferred
to the dynamic RAM. A counter will be
displayed on the system monitor. The number
count represents the number of256--byte blocks.
Data is read into the cassette interface. The
Keepvourg
ameson
Clear Leader
TAPE DECK
PHOTO SENSOR
LED
track. Get the
. ble from your
CA'T Box is ava1\a ggested list
'The . ·butor at a su
qu1cKIY tracK,
Atari d1stn
.
·ce of $995.00. .
contact Atan
C A1 Box ne\ps you ob\erns on
pn
.
l
rrnat1on,
,ne • • • and correct pr
A1ARI
For rnore ,n onnica\ services,
diagnose
t boards ,n anY
coin-OP ,ec QaKS Avenue,
nnted c1rcu1
Spnnt 2®
P
arne since
,ces ,none.
1105 N . Fair CA 94086.
v,de~ Jectron1c testing ~~M tester, \og1c
sunnyva\e,
norn1a·.
Frorn inside ca'. a\ services:
• Signature ana\y2;~~tro\\er tor corn-
parts and 1ecnn1c
robe, and bus \ snooting .
~onent-\eve\ troub :11ows testing ol
(408) 745-2d90ia\i\ornia:
r rn outs, e
30
New Z80 interlace essor-based
;~rts·. (800) 538-15 . (800) 538-1611
•
ZB0 rrncroproc
anY
euver-
,ecnnical services.
garne
b\e \1d \or easy rnan
• p.ernovea
ability.
A Warner Commun1ca11ons Company
Data East is now offering the cassette system
as a conversion kit, the DX-1 Multi-Conver-
sion Kit This conversion kit can be installed in
any old color Raster-scan monitor game.
Next month, the installation procedure for
the DX-1 Multi-Conversion Kit will be
published
STAR*TECH JOURNAL/JUNE 1983
DISPLAY CONTROL DIAGRAM
&~tk
1 K X 3
tape deck will pause again. During the tape
deck pause, the data is being verified. If the
data is correct, the data counter will decrement
by one, and the next block of data will be read
This will continue until the data counter reaches
001. At 001 the CPU will issue a rewind
command to the tape controller, and the cassette
deck will begin to rewind the cassette tape. The
tape will rewind for about 1 minute. The tape
will stop rewinding when the clear leader
portion of the tape is sensed. After the loading
process has taken place, the CPU then begins
to initiate the game program. The game is now
ready for play. The cassette loading process
will take place daily upon power up.
Beginning of Tape
THEORY OF OPERATION
When power is initially turned on, the system
CPU clears the display RAM and prints Deco
Cassette System. At this point, the CPU issues
a rewind command to the tape controller. The
tape will rewind and stop at the clear leader
portion of the cassette tape. The tape deck has
a light sensor circuit (see photos at right). It
consists of a photo sensor and a light-emitting
diode. When light from the LED passes through
the clear leader of the tape, the photo sensor
will detect it, and send a signal to the tape
controller CPU. The tape will then advance
until it reaches the beginning of tape (B.O.T.).
The tape deck will then pause. The B.O.T. is a
small hole in the cassette tape. The tape will
advance, and data will begin to be transferred
to the dynamic RAM. A counter will be
displayed on the system monitor. The number
count represents the number of256--byte blocks.
Data is read into the cassette interface. The
Keepvourg
ameson
Clear Leader
TAPE DECK
PHOTO SENSOR
LED
track. Get the
. ble from your
CA'T Box is ava1\a ggested list
'The . ·butor at a su
qu1cKIY tracK,
Atari d1stn
.
·ce of $995.00. .
contact Atan
C A1 Box ne\ps you ob\erns on
pn
.
l
rrnat1on,
,ne • • • and correct pr
A1ARI
For rnore ,n onnica\ services,
diagnose
t boards ,n anY
coin-OP ,ec QaKS Avenue,
nnted c1rcu1
Spnnt 2®
P
arne since
,ces ,none.
1105 N . Fair CA 94086.
v,de~ Jectron1c testing ~~M tester, \og1c
sunnyva\e,
norn1a·.
Frorn inside ca'. a\ services:
• Signature ana\y2;~~tro\\er tor corn-
parts and 1ecnn1c
robe, and bus \ snooting .
~onent-\eve\ troub :11ows testing ol
(408) 745-2d90ia\i\ornia:
r rn outs, e
30
New Z80 interlace essor-based
;~rts·. (800) 538-15 . (800) 538-1611
•
ZB0 rrncroproc
anY
euver-
,ecnnical services.
garne
b\e \1d \or easy rnan
• p.ernovea
ability.
A Warner Commun1ca11ons Company
Data East is now offering the cassette system
as a conversion kit, the DX-1 Multi-Conver-
sion Kit This conversion kit can be installed in
any old color Raster-scan monitor game.
Next month, the installation procedure for
the DX-1 Multi-Conversion Kit will be
published
Future scanning projects are planned by the International Arcade Museum Library (IAML).