Bit
No
.
0
1
2
Addr
e
ss
0
DLAB
=
0
Re
ceiv
er
Buff
er
!
Re
gi
s
ter
(
Re
ad
Only
)
RBR
i
Da
ta
Bit
0
'
Data
Bit.
1
Da
ta
Bit
2
0
DLAB
=
0
1
DLAB
=
0
3
Trans
mitt
er
In
terr
upt
In
ter
-
Li
ne
MODEM
ter
Ho
ld
in
g
En
ab
le
Ide
nti-
Co
ntr
ol
C
o
n
tr
o
l
Reg
is
ter
Reg
ister
fi
c
a
ti
o
n
Re
gister
Re
g
i
s
t
er
(
Writ
e
Reg
ister
On
ly)
(
R
e
a
d
THR
IER
IIR
LCR
MCR
Data
Bit
0
Enab
le
"0"
if
Word
Data
Rece
iv
ed
Inter
rupt
Leng
th
Term
i
n
a
1
Da
ta
Pe
ndin
g
Se
le
ct
Read
y
Av
ai
la
ble
Bi
t
0
(D
TR
)
Interru
pt
(WL
SO
)
(ER
BFI
)
Data
Bit
1
E
na
ble
Int
er
ru
pt
Wor
d
Req
uest
T
r
a
n
sm
i
t
-
ID
B
i
t
Len
g
th
to
Se
nd
ter
Ho
ld
in
g
(0)
Se
lect
(R
TS
)
Re
gist
er
Bit
1
Emp
ty
(WL
S1)
Inter
rupt
( ET
B
E
I
)
Da
ta
Bit
2
E
na
bl
e
In
ter
ru
pt
Num
ber
Out
1
Rece
iver
ID
Bi
t
of
Sto
p
Lin
e
(1
)
Bits
Sta
tu
s
(
STB
)
Interr
upt
(E
LS1
)
0
DLAB
=
1
L
i
n
e
MODEM
Di
v
i
s
o
r
Status
Statu
s
La
tch
(L
S)
Reg
ister
Re
gister
LSR
MSR
DLL
Da
ta
De
lt
a
Bit
0
Read
y
Cl
ear
to
(D
R)
Send
(D
CTS
)
Ove
rr
un
De
lt
a
Bit
1
Error
Data
Set
(O
R)
Read
y
(D
DSR)
Pa
ri
ty
Tr
ail
in
g
Bit
2
Er
ror
Edge
(P
E)
Ri
ng
Ind
i-
cat
or
(T
ER
I)
1
DLAB
=
1
Di
visor
Latch
(M
S)
DLM
Bit
8
Bit
9
Bit
10
N
1.0
.
'<:!'
Содержание MKI
Страница 1: ...SERVICE TECHNICAL MANUAL VOL 1 l SVI318 328 MKI MKII COMPUTER SYSTEM SVI SPECTRAVIDEO ...
Страница 7: ...4 Remove the seven retaining screens 5 Remove the cover 2 2 ...
Страница 8: ...6 Remove the screens on the metal cover 7 Remove the metal cover 2 3 ...
Страница 9: ...To r e assemble u se the above procedures in the rever se order 2 4 ...
Страница 134: ...5 CIRCUIT SCHEMATIC AND COMPONENT LAYOUT 5 1 ...