IMS IMSAI 8080 User Manual page 258

SIGNAL DESCRIPTION
Pin # Name
1 GROUND
2 PBO
3 PBl
4 PB2
5 PB3
6 PB4
7
PB5
8 PB6
9 PB7
10 PCO
11
PCI
12
PC2
13 PC3
14
PC4
15 PC5
16
PC6
17 PC7
18 PAO
PA1
19
20 PA2
21
PA3
22
PA4
23 PA5
24 PA6
25 PA7
26 AO
27
Al
28 A2
29 A3
30
DBO
31 DB1
32 DB2
33
DB3
34
DB4
35
DB5
36
DB6
37
DB7
38
/HIADD
TABLE 1
J2 & J3 CONNECTORS
Port B lines brought directly from
8255 to connector.
Port C lines brought directly from
8255 to connector.
Port A lines brought directly from
8255 to connector.
Buffered low order address bits from
microprocessor.
Bidirectional data bus from micro-
processor buffered through two 8216's.
High Address. Same as internal PIO-6
signal "/BDENA" except buffered through
an 8T97. This signal is the decode of
the PIO-6 port address.
Theory of Operation
Description
Address lines
3