Apple Lisa - The Expansion I;O Slots; Signal Description

Confidential
Lisa Hardware Reference Manual
THE EXPANSION I/O SLOTS
Three expansion devices can be connected to the Lisa system bus by
inserting the expansion cards into the slots at the back of the
machine. Slot 0 is the leftmost slot, as you face the back of the
machine. The three expansion connectors are 56 pin ZIF connectors.
These connectors permit you to install a card without removing the
card cage from the chassis.
SIGNAL DESCRIPTION
.The signal description given below describes the basic operation of
the bus interface signals. Any signal that has the same name as a
68000 signal (AS/ for example) is just a buffered version of that
68000 signal, and its function on the expansion bus is the same as
that described in the 68000 Micrprocessor User's Manual.
EXPANSION I/O CONNECTOR (top view)
+5 Volts
Digital Ground
+5 STDBY
UDS/
READ
DTACK/
VPA/
BAl2
BAlO
BAS
BA6
BA4
BA2
BDO
BD2
BD4
BD6
BD8
BDI0
BD12
BD14
BG out
BR
BGACK/
CPUCK
IAKn/
SHu/
-12 Volts
Front of Machine
+-------+
I 56 I 55 I
I
54 I 53 I
1 52 I 51 I
I 50 I 49 I
I 48 I 47. I
I 46 I 45 I
I
44 I 43 I
42 I 41 I
40 I 39 I
38 I 37 I
36 I 35 I
34 I 33 I
32 I 31 I
30 I 29 I
28 I 27 I
26 I 25 I
24 I 23 I
22 I 21 I
20 I 19 I
18 I 17 I
16 I 15 I
14 I 13 I
12 I 11 I
10 1 9 1
8! 7 I
6 I 5 I
4 I 3 I
2 I 1 I
+------+
Back. of Machine
+5 Volts
Digital Ground
Analog Ground
UJS/
AS/
+12 Volts
VMA/
BAll
BA9
BA7
BA5
BAJ
BA1
BOI
BD3
BD5
BD7
BD9
BDll
BD13
B015
BG In
E
UJMA/
RESET!
L.'ITn/
SLnl
-5 Volts
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