HP 85662A Troubleshooting And Repair Manual page 12

Table 2. BO-Wire Instrument Bus Pin Connection Table for IF-Display Section
Signal
Ground
GND
No Connection
2 NC
Instrument Bus Data Bits 0 - 15
IOBO
3
Instrument Bus Data Bits 0 - 15
IOB I
4
Instrument Bus Data Bits 0 - 15
IOB2
5
Instrument Bus Data Bits 0 - 15
IOB3
6
Instrument Bus Data Bits 0 - 15
IOB4
7
Instrument Bus Data Bits 0 - 15
IOB5
8
Instrument Bus Data Bits 0 - 15
9 IOB6
Instrument Bus Data Bits 0 - 15
10 IOB7
Instrument Bus Data Bits 0 - 15
11
IOB8
Instrument Bus Data Bits 0 - 15
12
Instrument Bus Data Bits 0 - 15
13
Instrument Bus Data Bits 0 - 15
14
Instrument Bus Data Bits 0 - 15
15 IOB12
Instrument Bus Data Bits 0 - 15
16 IOB13
Instrument Bus Data Bits 0 - 15
17 IOB14
Instrument Bus Data Bits 0 - 15
18 IOB15
No Connection
19 NC
No Connection
20 NC
No Connection
NC
21
HIGH = IF-Display Section
HPON
22
Power ON
Instrument Bus Address Bits 0 - 4
ADRO
23
Instrument Bus Address Bits 0 - 4
24
Instrument Bus Address Bits 0 - 4
25
Description
Pin Signal
26
ADR4 Instrument Bus Address Bits 0 - 4
27
28 ADRS Address Bit 5 not used
29 NC No Connection
No Connection
30 NC
31 KR8 Key Rows 8 - 11
Key Rows 8 - 11
32
Key Rows 8 - 11
33
KR 11 Key Rows 8 - 11
34
Key Columns 0 - 7
35
Key Columns 0 - 7
36
Key Columns 0 - 7
37 KC2
Key Columns 0 - 7
39 KC4
Key Columns 0 - 7
40 KCS
41 KC6 Key Columns 0 - 7
Key Columns 0 - 7
42 KC7
43 LSTP LOW = Stop Processor
44 HSWP HIGH = Sweeping
45 LSRQ LOW = Service Request
LDSR LOW = Digital Storage Ready
46
47 LB10 LOW = RF Section I/O Strobe
48 GND Ground
49
Strobe
50 GND Ground
IF Overall Block Diagram 3
Description