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•
DR-U124X-1, DR-U124X-4, DR-U124X-PA
4. IC INFORMATION
• The information shown in
the
list
is
basic information and
may
not cor-
respond
exactly
to that shown in the
schematic
diagrams
.
•
LC89512W-V79 [IC801 : MOTHER BOARD ASSY (SCSI)]
• ROM Decoder
• Block Diagram
EXTERNAL
DATA
BUFFER RAM
I
100-
107
LC89512W-V79
ll
RAO-RA1
7
RCS
ROE
RWE
1- -
-
-
-.--
-
-
_ -_.__
·
_
-_-_-_-_-_-_-_-_-_-_-
_
-_-_- _,__· _-_-_- -
- -
"'j
XT
ALCK
I
I
~
CD-
DSP
• Pin Function
No. Pin Name I/O
-
1
DB7
I/O
2
Vssl
-
-
3
DBP
I/O
- -
4
ATN
5
Vssl
-
-
6
BSY
I/O
- -
7
ACK
8
Vssl
-
1
4
I
DRAM
I
/
F BLOCK
I
D
I
I
~TAL
...
-
-
. ..
LRCK
BCK
SDATA
C2 PO
MCK
I
I
I
I
WFCK
EXCK
SBSO
..
...
-
-
CD-
ROM
DE CODER
BLOCK
SCS
I
l/F
BLOCK
-
. ..,-
__,
~
- - - -
DB7
-
DBO
- -
DBP
-
/
--
-
.....
- -
BSY
ACK
- -
RST
-
]
/
0
- -
MSG
SEL
AIN
-
C/D
SC
OR
1
~--------------
-
-
--
--
-
-
-
·
_____ J
CS
RD
RS
r
WR
I
NT SW
AIT
D0
-
07
,
MICRO
COMPUTER
Description
No. Pin
Name
I/O
-
SCSI
terminal
9
RST
I/O
SCSI
terminal
- -
GND
for
SCSI
I/F driver
10
MSG
HOST
COMPUTER
Description
11
Vssl
-
GND
for
SCSI I/F driver
SCSI
terminal
-
12
SEL
I/O
SCSI
terminal
GND for
SCSI
I/F
driver
13
CID
14
Vssl
-
GND
for SCSI
I/F
driver
SCSI terminal
- -
15
REQ
I/O
SCSI terminal
GND for SCSI I/F driver
16
I/O
(
(
(
-
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