The Logic A To Logic B Bus Connectors - HP Integral Personal Computer Service Manual

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10.4.2 The Logic A to Logic B Bus Connectors
The logic A to logic B bus connects the I/O devices on the logic B PCA to the CPU on the logic A
PCA. Table 10-3 gives the pin assignments for the connectors. For a discussion of the logic A to logic.
B bus signals, refer to section 5.7.2.
Table 104. Logic A to .... Ic • aus Pin Connections
........ t ...... Iat
Pin
.... Ic A Connector J1
LogIc A Connector J2
Logic. Con--=tor J10 Logio •
Connector J11
1 IBD7 IR6
2 IBD6
IRS
3 IBDS 1R4
4
IB04
1R3
5 [B03
IRI
6
[B02 PWRDN
7 IBOl SPKWR
8
[BOO HPIB
9
RESET
RTC
10
[BAS PRNT
11
IBA4
DISP
12 IBAl DISC
13 IBA2
Wi
14
IBA1
RO
10.4.3 The
1/0
Backplane Connectors
The external I/O bus is transferred to the I/O backplane PCA by a 64-conductor ribbon cable. This
cable extends from connector J6 on the logic A PCA to the I/O backplane
peA.
Table 10-4 gives the
pin assignments for connector J6 in columns 2 and 3.
The I/O backplane PCA has two output connectors, one for port A and one for port B. Table 10-4
gives the pin asSignments for these connectors in columns 4 and S.
For a discussion of the external I/O bus signals, refer to section 5.8.2.
Note.
The Integral PC supports the Level 0 Subset of the P-bus (the Personal Computer
Group compatible bus) with the exception that the I/O backplane connectors provide the
outer two rows of pins only (row A and row C).