DMF-9020/9020(S)/MD-2070
7
CIRCUIT DESCRIPTION
Pin No.
Port Name
I/O
Description
1
SCLK
O
Text data read clock
2
NC
O
no use
3
XMODE
O
Text data decode LSI reset
L : POWER DOWN
4-6
NC
O
no use
7
RESET
–
Microprocessor reset
8
VDD
–
Microprocessor power supply (+)
9
X2
O
Oscillation (12MHz)
10
X1
I
Oscillation (13MHz)
11
VSS
–
Microprocessor GND
12,13
NC
O
no use
14
DATA
I/O
IBM key board I/F data line
15
CLOCK_CHG
O
IBM key board I/F data output line
H : CLOCK LINE LOW
16-20
NC
O
no use
LC89170M
CYBER TITLER
MECHA uCOM
(X25) J7
(X25) IC31
(X25) J2
(X25) IC27
(X25) IC28
(X25) IC30
IBM KEYBOARD
DQSY
DQSY
73
1
ADDRESS
43
42
40
40
39
38
37
36
35
34
33
32
31
30
29
ASTB 44
RD 23
WR 22
CS 21
/DATA
HM62256BLFP-8T
TC-74HCT373AF
[ SRAM ]
BAS
SCLK
SRDT
XMODE
TTXD
TRXD
MTXD
MRXD
MENA
DATA
CLOCK
CLOCK_CHG
78
3
80
79
SUB
U-COM
51
50
49
14
77
15
RxD
CRxD
CTxD
DATA
CLOCK
CENA
TxD
SCLK
SRDT
XMOD
2. Sub microprocessor : uPD784035GC836 (X25 : IC28)
2-1 Microprocessor peripley block diagram
2-2 Pin description
1-3 Initialization
POWER
= ON (DM-9090,DM-5090)
REC INPUT
= ANALOG
AUTO CUT
= OFF
AUTO/MANUAL
= AUTO
= 0 dB
PLAY MODE
= TRACK
REPEAT
= OFF
TIME DISPLAY
= )
LEVEL METER MODE
= NORMAL MODE
AUTO TNO TIME
= 2 sec
AUTO TNO LEVEL
= 0 (-55 dB)
REC END WRITE
= ON
DRIVE
= ON
PRESET TITLE
= PRE1 : Pops
PRE2 : Rock
PRE3 : Classic
PRE4 : Jazz
PRE5 : Disco
PRE6 : Best Hits
PRE7 : Air Check
PRE8 : No.
PRE9 : Vol.
: Backup item
1-5 Key voltage matrix
Model
INISW
INISW
DMF-9020
3.5 (V)
MD-2070
HIGH
1-4 Switch control table
No.
Name
I/O
Description
66
SWDT
O
Data for writing to CXD2652AR (IC2)
67
SCLK
O
Serial clock to CXD2652AR (IC2)
-
-
H; ON
H; ON
80
-
O
No used / pull up
H; ON
83
ADRST
O
Data to SM5844AF (IC25) ADC reset
84~91
AD0~AD7
O
SRAM address / data (AD0~AD7)
92~99
A8~A15
O
SRAM address (A8~A15)
100
Vss
-
GND
DIGITAL REC LEVEL
FADE
= OFF
FADE TIME
= 3sec
68,69,70
N.C.
71
EXDT
O
Extension port data
72
FLDCE
O
CE to FL driver IC(LC75710NE)
73
DRDT
I
Data for reading form DIR.(LC8904Q)
74
DWDT
O
Data for writing to DIR.(LC8904Q) ,FL driver IC(LC75710NE)
75
DCLK
O
Clock to DIR.(LC8904Q) ,FL driver IC(LC75710NE)
76
DLAT
O
Latch to DIR.(LC8904Q)
77
DEMPH
I
Emphasis form DIR.(LC8904Q)
78
DSUB1
I
SUB1 form DIR.(LC8904Q)
79
DSUB2
I
SUB2 form DIR.(LC8904Q)
80
SRCLAT
O
Latch to SRC.(SM5844AF)
82
SRCCK
O
Clock to SRC.(SM5844AF)
83
SRCDT
O
Data to SRC.(SM5844AF)
0.0V
0.8V
1.6V
2.4V
3.2V
4.0V
KR0 POWER EJECT
PAUSE
-
FF
-
KR1
STOP
REC
PLAY
-
FB
TT
SEARCH
KR2
FADE/
EDIT/
TT
REC
MONITOR
-
DEL
SPACE
INPUT
INPUT
KR3
SET
ENTER/ REC MODE/
-
-
-
TIME
CHR
DMF-9020(K)
INT1,1P(
98.11.26
5:24
PM
y[W
14
