Service Manual

IC28 OCTAL BUS TRANSCEIVER
IC 74ACT245 SOP 300MIL
Parts No. : 314-0649
BTopView
IC31/32 DRAM
IC HM514260AJ-7 SOJ
Parts No.: 315-0947-70
IC KM416C256BJ-7 SOJ SUMSUNG
Parts No.: 315-0983-70
BTop View
vee
1/015
1/014
1/013
1/012
Vss
1/011
1/010
1/09
1 1/0s
NC
LCAS
UCAS
OE'
AS
A7
AB
A5
A3
A4
B Logical Operation Circuit
IC UPD424260LE-70-E2 SOJ NEC
Parts No. : 315-0985-70
IC M8814260-70PJ-G SOJ FUJITSU
Parts No. : 315-0984-70
-61-
B Truth Value Table
INPUT
FUNCTION
OUTPUT
STATE
G IDIR ABUS I
BBUS
LlL
OUTPUT
INPUT A=B
L I H
INPUT OUTPUT
B=A
H lx
High impedance
z
X: Don't care
Z: High impedance
IC TC514260BJ-70 SOJ TOSHIBA
Parts No.: 315-0986-70
IC HY514260BJC-70 SOJ HYUNDAI
Parts No.: 315-1030-70