EPSON Progression 4
Main System Board Diagram
alternate
VGA feature
-
connector
VGA video
parallel
serial 2
serial 1
mouse
keyboard
, ,
PI
nl
In
In
w
108
1
--3
1
ll
u109
l-l
0
u91
UE
El
131
I
0
u97
El
103
n
u9e
u
El
102
0
u99
El
100
0
U99
r-l
u90
ml
u75
u53
ml
u77
US3
ml
ue1
us5
an
UBO
u54
ul
U76
u57
ul
u79
US8
m-l
u79
u59
q
u37
17
UBO
0
US1
0
us2
17
U63
0
u54
Uil
u
I7
UIO
LL
u12
0
u13
cl
UlS
0
Ul6
0
u9
n
Uli
-u
L13
0
&16C&5&C~J2c@L~
%!
Lll
0
SIMM2
SIMM1
option board
-
riser card
connedor
FDD
-
connector
HDD
!
connector
EPSON Progression 4-4
5/3/93