![background image](http://html.mh-extra.com/html/sharp/up-3300/up-3300_service-manual_373322061.webp)
10. WAIT control
The weight control function built in the MPCA8 is used to provide an
interface with low-speed devices.
10-1. Block diagram
The block diagram of the wait control function is shown.
Fig. 10
In the figure, the decoder, wait enabling register, AND-OR sections
are the same as those in the MPCA6 or 7, but other components are
newly incorporated in the MPCA7.
EXWAITZ and WAITZ are external weight signals which are to be
ORed inside the MPCA8 and output to the WAITZ. The EXWAITZ is
a general-purpose wait request terminal, and WAITZ is the wait re-
quest signal from the VGA controller.
11. CKDC9
The UP-3300 performs the following controls, using CKDC9.
•
Customer display
•
Clock
•
Buzzer
•
System reset
11-1 Interface
CKDC9 is connected through the MPCA8.
Fig. 11
12. Option RAM interface
12-1. Interface
The expanded RAM connector terminals are shown in the table.
The 72 pin S.O. DIMM is used for the connector.
Extension RAM connector terminals
ADDRESS
DECODER
RAS
ROS
IO
X3
WAIT
ENABLE
REGS.
ENABLE
1WAIT
2WAIT
3WAIT
WAIT PULSE
GENERATOR
ADDRESS
DATA
WAIT
CONTROL
REGS.
EXWAITZ
VWAITZ
S
E
L
E
C
T
E
R
WAITZ
<00FF8Dh>
<00FF8Fh>
DATA
TXD2(P87)
SCK2(P83)
RXD2(P84)
IRQ0
RES
STOP
(P57) FT12
HTS
SCK
STH
TXD1
SCL1
RXD1
IRQ0
HTS1
SCK1
STH1
INT1
RESET
HTS
SCK
STH
KRQ
SHEN
SRES
STOP
SW
RESET
RESET
H8/510
MPCA8
Standard
CKDC9
Signal
Name
Pin
No.
GND
1
GND
2
—
3
—
4
—
5
—
6
—
7
—
8
—
9
—
10
A14
11
A15
12
A16
13
A17
14
A18
15
A19
16
—
17
PCE22_E
18
PCE21_E
19
—
20
PSREF
21
PCE22_O
22
PCE21_O
23
GND
24
Signal
Name
Pin
No.
—
25
—
26
—
27
—
28
A13
29
A12
30
A11
31
A10
32
A9
33
A8
34
A7
35
A6
36
A5
37
A4
38
A3
39
A2
40
A1
41
A0
42
D15
43
D14
44
D13
45
D12
46
D11
47
D10
48
Signal
Name
Pin
No.
D9
49
D8
50
D7
51
D6
52
D5
53
D4
54
D3
55
D2
56
D1
57
D0
58
GND
59
NC
60
OWR
61
—
62
—
63
—
64
—
65
—
66
HWR
67
—
68
VMEM
69
VMEM
70
GND
71
GND
72
7 – 25