I
I
I
1
I
F
BASIC
MASTER
LEVEL-3
Minif
loppy
Disk
Dr
j_ve
Unit
Mp
-
3550
ano
Minifloppy
Disk
Card
Mp
-
1
B02
SERVI
CE
MANUAL
1
982
CON
TEN
TS
1
.
General-.
2.
Features
3,
Specifications
ln.
Part Names
5.
Termj-nal
Connection
Specif
ication
6.
Explanation
of
f
Cs
in
Use
7,
Circuit Explanation
8.
Adj
ustment
Method
9.
Minifloppy
Disk
Card Expansion
Method
1
0
.
Servi
ee
P
oint
s
11
.
Trouble
Shooting
1
1
2
lr
5
21
2/+
5B
OJ
67
71
'l
.
GENERAL
x
l,IP
-3550
The MP
-
3550
minifloppy
Basic
Master
LeveI-3,
II
through
the
medium
is the outside memory
It
can store
and read
reliably.
The
MP
-
3550
UNI T-1
connected
up
to
the
disk
unit which is
connected
to the
M8-6890
and
Basic
Master
Level-3
Mark
of
the
mi-nif loppy di
sk
card
,
MP
-
1 802
,
equipurent f
or the
per
s
onal
c omputer
.
program
lists and
data
quickly
and
(ttre
first)
can be
activated once
Level-3 eonnector.
2.
MP-1 BO2
The
minifloppy disk
card,
MP
-1
802,
is inserted
in
the
expans
ion
slot of
the
Level-3
.
I
t
is the
Lev
eI-3
expansion
interface
card
which
enables
conneetion
with
the
MP
-
3550
UNI
T-1
(f
:-rst
unit) and the
MP-
3550
UNI T-2
(
second unit)
.
FEA TURES
x
MP
_
3550
1
.
Program recording and
reading is aceomplished quickly
and
reliably.
2. Data
input/output
and correction
can be
executed speed
ily.
Operation
is improved
with
the
inclusion
of
two built-in
drives.
MP-1802
3.
1.
2. Connecting the
MP
-
3550
UNI T-2
(
second expansion use
)
to
the MP
-
3550
UNI
T-1
(
tfre
f irst
)
,
expans
j-on
is
possible
.
...f2
3.
SPECIFICATION
3
-1
tlP
-3550
x
Data
Record Capacitv
UNI T 655 Kbytes
DRI
VE
328
Kbyte
s
Number
of sides
per
DRI VE
2
sides
No.
of cyfinders
per
DRI
VE
/+0
cylinders
No. of
sectors
per track
1
6
sectors
No. of data
per
sector
256
bytes
Note
:
The
above figures
may
vary depending
on
the
system
diskette
in
use.
Refer to the
system
disk
nanual
f
or details.
*
Environnent
Conditions
ftem
Te
mp erat ur e
Humidity
Max.
Wet
Bulb
Temperature
0perati-on
5oc
-
35oc
2or"
gof,
No
dew at
zgo c
Non
0perati
on
-1ooc-
/r5oc
B
1[
8oi[
Tran
sp or tat i on
-1ooc-
5ooc
B%
-
B0%
Note
:
During
non-operation
or
transportation,
the
head
protection
sheet should
be
placed
in
eaeh drive
afte
the disk has been
removed
from
the
minifloppy
disk
drive
MP
-
3550
.
.
.
.
/3
*
Specification
3
-2
t4P
-1
802
*
Spe
cifieation
Transfer
Speed 250
Kbi
L
f
sec
.
Record
Medium
5i
inch diskette
No.
of ICs
6e
No.
of
Transistors
56
No
.
of
Diode
s
75
P
ower
AC
100V
50/60
Hz
Power
Consumption
55W
Dimensions
27.0(W)
x
21
.O(H)
x
27.5(D)cn
We
ight
9.
o
kg.
Accessories
Dr:ive
belt
Drive
Capacity
MP-3550
x
2
units
(lr
drives)
I
C
Number
28
Transistor Number
lr
Diode Nunber
2
P ower
DC
+5V
Power Consumption
3W
Dirnens
ions
,1.0.0(W)
x
tr.5(jf-)
,x
23.5(D)
cm
We ight 0.31
kg.
.../4.
4.
PART
NAI'IES
4-l
.
MP-3550
oRrvE-0
ORIVE.I
drive
-1
drive-
2
power
switch
I roll
_
oFF
power
cord.
holder
fan
connector
(data)
POwer
Ccrrc
+-2. MP-|802
(-to
MP-355OttNIT-l)
l{DB-A
,C,8,
-I{DB-B
P.C.B.
-
'.-3
edge
conneetor
(to
J.eyel3)
power
lamp
.../5
5-1
Mp-
3550
connector
Ilor
Receptac]-e
connector
: c connector
I
I
L
50PL
Pin Header
:
C Connector
J
q
/
5.
TERMINAL
CONNECTTON SPECTFI
CATI..ON
Pin
No.
S
ignal
Data
Direction
Level-3c'
Inside
Expl-anati
on
1
HEAD
LOAD
Head
l-oad selected
drive
when
this signal
is
tL
I
2 SE_IEET-3
___-__--_->
When
rL |
,
enables
sendin5
and
receiving
of
Drive
3
s ignal
3
ET.DY
rL I
when diskette
i-s
rotating
normally
/,
INDEX
<-
Outputs
rLf
pulse
when
index hole
is
detected
after
diskette
is rota-
ted
5
m0
Enables
Drive
0
signal
sending
and
receiving
when
lL I
6 SIET1
------=-+
Enables
Drive
1
signal
sending and
receivi-ns
when
lL I
7
mffi
Enables
Dri've
2
signal
sending
and receiving
when
lL I
8
MOTOR
ON
Drive
motor operates
when
lL I
9
DI
RECTI
ON
IN
Control-s
head
movement
direction
10 S
TEP
t
+
Moves
the
head
one track
per
pulse
11 i[mTETlm
Write
data signal to
the
diskette
12
WRI
TE
GATE
Writing
is
possibl-e
when
tL t
13
TRACK
OO
Becomes
tL
t
when head
is
in
Track 00
position
1l+
WRI
TE
PROTECT
Becones
rL
q
when
write
protected
disk is
inser:ted
...
/6
Pin
No.
S
i
gnal
Data Direction
Level-3**Inside
Explanati
on
15
READ DATA
Reads
out
data s ignal
from
the
diskette after
waveform restoration
16 mE1
Sel-ects
Side
t head
when
tLt
,
Side
0
head when
tH
t
17
D-RCLK
Clock
signal to divide
data
bit
and clock bit
from
READ DATA
1B
+5v
+
5V
power
supply
19
T t
20
21
zz
23
2/,1
J
J
25
+
5v
26
DOUBLE DEN
Becomes
rHr
when writing
and
recording
of double
dens
ity
27
GND
GROUN
D
2B
1 i
2g
30
31
)1
33
3lr
35
36
37
.,
.
/7
Pin
No.
S
igna 1
Data
Direction
Level-3oInside
E*planation
38
39
lr0
/+1
/+2
lr3
/+ lt
lr5
lr6
/+7
J
I
l+8
GND
lr9
50
rr--fr
=
Unused
termi-nal
.../8
5
-2
MP
-
3550
Drive
0,
1
Unit
Connector
(l
tp
P
in
Header
:
E
Connector
)
Pin
No.
S
ignal
Data
Direction
fnside
H
MDD
Explanation
1
GND
GRO
UN D
z
HEAD
LOAD
-
Head loads
when
rrLrf
(
when
REA
DY
-
rr
L
tf
in
selected
drive)
1
GND
GRO
UN D
l
4
GND
<---.-->
GRO
UN D
5
GND
GRO
UN
D
6
nnalv
Becomes
rrLrr
when
the
disk rotates norma11y.
7
nnTn
LJII
]J
GROUND
B
INDEX
0utput
tfLrr
pulse
when
i-ndex hole is detected
after
diskrs
rotation.
GND +-+
GRO
UN D
10
Sgi,gCT
O
Enables
drive
0
sig.
receive/sendable
when
Itr
rl
!1
.
11
GND
GRO
UN D
12
SEIEMl
When
rfL
rr
,
enable s s end-
ing
frecei-ving
of
drive
1.
13 GND
GROUN
D
4t
t4
t\
GND GROUND
to
MOTOR
ON
Drive
motor
oDerate
s
when
lf
L
lf
.
17
GND
GRO
UN D
18
m Control
head
move
di-
rection.
1g
GND
GRO
UN D
...
/g
Pin
No.
S
ignal
Data Direction
Inside
c+
MDD
Explanation
20 s-m Moves the head one
track
per pulse
21
GND <-----€
GROUND
22
WRI
TE
DATA
Write data sig. to
the
disk
23
GND
4
GROUND
2/+
WRT
TE
GATE When
frLrr,
enable
write
25
GND
c---------)
GRO
UN D
26 TRACK OO
-------'
Be
c
ome s
fr
L
rf
when
head
is in
track
00 position
27
cNl
GROUND
2B WRI TE
PROTECT Beeomes
lrLll
when
write
protected
disl
is inserted
2g
GND
-
GROUND
30
READ
DATA
Read
data
s ig
.
from
the di-sk.
31
GND
<__--------)
GROUND
32
SI
DE.T
Seleet
side
t head
when
frLrtrside
0
heac
when
fr
Hil
33
GND
<___--+
GROUND
3lr
tr
--rr
=
unused
terminal
...
/10
ItJ
5
-3
MP
-
3550
UNI T-2
TERMINAL
PARTS
Pin
No.
S
ignal
Data
Direction
Level-3<+fnside
Exnlanat
i
on
a
I
HEAD
LOAD
Head
load
the
selected
drive when
rL
I
I
3
REA DY
Becomes
rL
I
when disk
rotates
normally
lr
INDEX
0utputs
rL I
pulse
when
index hole
is
detected
af ter disk
I
s rotati-on
5
SELEcro
When
tL t,
enables send-
itg
f
receiving the
Drive
0
s ignal
6
SELECT
1
--?
Enables Drive
1
signal
s end
ing
f
r e ce
iv ing
ih"rt
lT I
7
tuoton oll
--->
Drive
motor operate s
when
lL I
9
m
Controls
head movement
direction
10
d mnn
\IHP
V
LJ-IL
M
ove
s head
one track
per puls
e
11
WRI TE DATA
----)
Wr
ite
data
s
ignal
t
o
diskette
12
WRI
TE
GATE
--_-J
Writing
is possible
when
rL
r
13
TRA
CI{ O O
Becomes
rL
I
when head
is
in
Track 00
Dosition
1/+
WRI
TE PROTECT
Becomes
rL
I
when write
protected
disk is
inserted
15
mmIn
F--
Reads
out
data s ignal
from diskette
after
waveform restoration
16
STIE-]
--)
Selects Side'1
head when
rL |
,
Side
0
head
when
rH
t
17
D-RCLK
Cl-ock
signal
to divide
data bit and clock
bit
from
READ DATA
...
/11
Pin
No.
S
ignal
Data
Direction
Level-3<--.+lnside
Explanation
1B
1g
20
21
22
23
2/+
25
26 DOUBLE
DEN
_-....--
Becomes
fH I
with
writing
and
recording
of
double
dens
ity
27
GND
GROUND
2B
1
2g
30
31
32
33
3L
35
36
37
3B
39
/+0
l+1
l+2
lr3
/, lr
,
.
.
/12
Pin
No,
S
ignal
Data
Direction
Level-3e'-Inside
E*planat
i on
lr5
/r6
t7t
4l
J
/+8
GND
).4
.+/
50
fr---rt
=
unused
terminal
...
/13
5.1
MP-1 BO2 UNI
T.1 CONNECTION
CONNECTOR
Pin
No.
S
ignal
Data Direction
Ins
ide G+UNI
T
1
Exol-anation
I
fi]il[D-ImD
When
rL
t,
head loads
selected drive
2 SELECT
3
When
tLt,
enables
sending
freceiving
of
Drive
3
signal
3
MTffi
Becomes
rL
I
when
disk
r
otate
s
normally
/+
rm-ET Outputs
rL I
pulse
when
index
hole
is
dete
cted
after
diskfs rotation
(
ffio
---.9
When
tLr,
enables
sending
freceiving
of
Drive
0
s
ignal
6 SELECT
1
When
tLt,
enables
sending
/"uceiving
of
Drive
1
signal
7
sj;Em
When
rLr,
enables
sending
f
receiving
of
Drive
2
signal
B
MOTOR ON
Drive
motor
oDerate
s
when
rL I
9
DI
RECTION
IN
Contr
ols
head movement
direction
10 S TEP
Moves
head
one track
per pulse
11 WRI
TE
DATA
Write
data signal
to
diskette
12
WRI
TE
GATE
Writing
is
possible
when
rL I
13
TRACI{O6'
Becomes
rL
I
when head
is
in
Track 00 positior
1/+
WRI
TE
PRO
TECT
(-
Becomes
rL
I
when write
protected
disk is
inserted
15
READ
DATA
a-
Reads
out
data
signal
from diskette
after
waveform restoration
16
SIDE
1
.--=+
Selects
Side
t head
when
tLr,
Side
0
head
when
rHr
.
. .
/1/n
Pin
No.
S
igna
1
Data
Direction
f nside.*UNI
T
1
Explanation
17
D-RCLK
Clock
signal
to divide
data
bit and
clock bit
from
READ
DA
TA
18
+5v
1g
t
I
20
21
22
23
2/+
I
I
25
+5v
26
DOUBLE
DEN
Becomes
rHr
with
writing
and
recording
of
double
dens
ity
27
GND
-
GROUND
28
I
2g
30
31
32
33
3lr
35
36
37
38
39
/+0
/,r1
.../15
Pin
No.
S
ignal
Data
Direction
Inside*+UNI
T
1
Explanat
i
on
/+2
/r3
/,
lr
lr5
/+6
/+7
I
I
/+8
GND
/-9
50
l---l
=
Unused terminal
.../16
5-5
MP-1802 Card
Edge
Connector
(Unn-A
PCB)
Pin
No.
S
ignal
Data
Directi-on
Level-3;Inside
E"planation
1
Data
bus
2
3
DO
lr
D1
5
D2
(-j
6
D3
7
D/+
<--+
8
D5
c--__J
9
D6
(-________)
10
D7 e------------?
11
AO
.-__)
Addre
s s
bus
12
A1
--.....=-)
13
A2
--
1/+
A3
15
A/+
16
A5
17
A6
18
A7
1g
A8
----=+
20
A9
21 A1 0
--_---+
22
A11
---+
23 A1 2
2lr
A1
3
25
A1 /+
:--::--)
26
A1
5
-----------+
27
.
..
/
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