-
PC-l600
Pin
Symbol
1/0
Active
Level at reset Description
No.
level
42 107N
Out Low
(High)
2.5" FDD select signal.
(Out through the address 70H - 7FH)
43
CSNO
Out Low
(High)
32KB ROM select signal.
[ ELH, MREG, PT , • • •. H;gh ]
PU .....•....•.. Low
Address .......... 4000H ~ 7FFFH
(PV ... Low; printer, High; FDD, CMT)
44~51
DBO ~ DB7
ln/Out (8-bit) data input/output,
52
PAOl ~ PA51
In Low Input port (port address: 81 H).
~
(PAO ~ 61 correspond to 00 ~ 6.
57
60
PA61
(Interrupt controlled by F F1 (address: SOHl outputs GO~ 6.)
58
GND Power supply.
59
(NC)
61
PA7B Out
(High)
High CMT I/F circuit outpur.
(The cassette signal that has been amplified and waveform shaped is
sent from this line.) (See Fig. 6.)
62
PA6N
(Out) (Low)
High Comprise an amplifier when a feed back resistor is connected across
64 PA71 In
PA7N and PA71. (See Fig. 6.)
(Input signal is given from PA71.)
63
(NC)
- ------- -- -----
3-2. Printer drive IC (LB-1247)
From gate a"av
I
--, I" •
IN
ULOW
~ ~ Load
Eight circuits shown in Fig.7 are contained in a single driver
circuit. The driver 1 is sued for driving of printer X and Z
motors and the driver 2 is used for driving of printer Y
motor and and remote relay. (Two circuits are not used for
the driver 2.)
Romote
vcc
VP
Driver 2
F<~ {
PB4N
==:J
IN6
OUT5' RRv
ga ••
array
OUT61 RRY OFF
PB5N INS
OFF ON
~
REM
3
o
I ""
.!fu
-0'
:ll
Driver
As shown above, the output transistor within the driver is
turned active in the period that the driver input signal
(signal from the gate array) is low level, so that current
flows across the load connected to the output terminal of
the driver. Fig.7 shows the equivalent circuit of the driver.
Relay
VDD VCCI VCC2
LI"
-U-
(Fig.8) Remote circuit
To increase the torque of the printer Y motor, a SV zener
diode (HZSCl) is inserted across two VCC2 (which con-
tains reverse surge absorb diode) of.the driver 2.
(Fig.7) Driver (LB1247) equivalent circuit
3-3. Printer (PTMPG3308A)
The PTMPG330BA ball point pen type, 4-color, plotting
printer consists of three. stepping motors which are used to
control the direction X (horizontal pen movernent), the
direction Y (vertical pen movement), and the direction Z
(pen up/down and color
chanqe),
Each motor is driven
by
coils of A, B, C, and D. The CR detect switch is attached to
the left side of the printer for detection of a CR via the pin
PA51 of the gate arrav. The X and y motors are 1-2 phase
excited and the Z motor 2-2 phase excited.
See Section 7, Printer, for detail of PTMPG3308A printer
spedfications, characteristics, drive method, etc.
-n7-
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