HP 8112A, Operating, Programming And Servicing Manual

Page: 358 / 406

FROM
U30
BUS
ADDRESS BUS
MA I N DECODER
+SV C 1 7
6
A
L
2
1
L
AL3 2
2 U 1 2
A ! S 3 TO
U l 3/4
4
3. Figure B-5 shows the change to Figure 1 0.7-5 for enabling five
individual ROMS.
ROM l ROM2 R O M 3
S000-SFFF 7000-7FFF 8000-BFFF
A0 8
L
A0 8
L
A 0 8
L
Al
7
A l 7
A l
7
6
2
A2 6
2
A2 6
2
4 4 4
A
3
s
8
"'
A3 s
8
"'
10. L u A
3 s
8
I/)
A4 4
"'
A4 4
"'
A4
4
"'
I S
"'
I S
"'
1 6
"'
AS
3
32
...
AS
3
32
...
AS
3
3
2
...
AS
2
'
AS
2
'
AS
2
'
64 ISi
64
ISi 64 ISi
A
7
1
<(
A7
I
<(
A7 L
<(
TO
U 1 4/4
2
3 AS 23 AB
23
AS
22
AS
22
AS
22
Al0 LS
A ! 0
I S A 1 0 lS VMA
A l ! 18 A l l 1 8 A l l L S
F U38 F F
13
ROMI 2
0
U9 UB
12
G
G
G
ROM ROM ROM
I I
AG
s 0
0
AG
s 00
AG
00
T P I
AG
1
0
01
TP2
AG
0 1
TP3
AG
10 01
AG 1 1
02
AG
1 1 0
2
AG
1 1
02
AG 1
3
03
AG 13
03
AG
1 3
03
AG
1 4
04
AG
1 4
0 4
AG
1 4 04
AG
l S
OS
AG l
S OS
AG
l S
OS
AG
1 6 0 6
AG
1 6 0 6
A G
1 6 06
AG
1 7
07
AG
17 07
AG 1
7
07
ROM2
ROM3
ROM4
ROMS ROM6
S000-SFFF
A000-AFFF
B000-BFFF
A0 8
1
A0
e
1
A0 8
1
Al 7
A l
7
A
l
7
A
2 s
2
A 2
6
2
A2
6
2
4 4 4
A 3 s
8
"'
1
0. lu
A
3 s
8
"'
A 3
s
8
"'
1
0. l u
A4 4
"'
A4 4
"'
A 4 4
"'
L S
ISi
L S
1'
l
S r
AS 3
32
"f AS
3
3
2
A
S
3
32
A S
2
S4
ISi A
S
S4
ISi AS
2
S4
ISi
A7 1
<(
A7 1
<(
A7
<(
AS
23
AS 23 AS
23
A9
22
AS
22
AS
22
A 1 0 1
9
A l 0 1 9 A 1 0 19
A l l 1 8 A l l 18
A l l
1 8
ROM4
+SV
F
U7
r
U6
r
us
20 G
G
ROM
ROM ROM
AG
9 0
0
AG
9
0
0
AG
9 0
0
TP4
1 0
D I
TPS
1 0
0 1
TPS
1 0
0
1
AG
1 1 02
AG
1 1
02
AG
1 1
02
AG
AG
AG
AG
1 3 0 3
AG
1 3
03
AG
13 03
AG
1 4
04
AG
1 4 04
AG
1
4 04
AG
l
S
O
S
AG l S
OS
AG
l
S OS
l
S
OS
lS
OS
lS
OS
AG 17
07
AG
1 7 07
AG 1 7
07
AG
AG
AG
ROMS
ROMS
Figure B-5. 08 1 1 6-66533: ROM schematic
B-24 Backdating