S-100 (Altair bus) pinout:
1
+8vunregulated 8v power supply
2
+16vunregulated 16v power supply
3
XRDYcauses CPU to enter wait state
4
VI0vectored interrupt 0
5
VI1vectored interrupt 1
6
VI2vectored interrupt 2
7
VI3vectored interrupt 3
8
VI4vectored interrupt 4
9
VI5vectored interrupt 5
10
VI6vectored interrupt 6
11
VI7vectored interrupt 7
12
(no use)
13
(no use)
14
(no use)
15
(no use)
16
(no use)
17
(no use)
18
STADSB3 state status line cpu buffer
19
CDSB3 state command line buffer
20
UNPROTClears PROTECT flip flop of board
21
SSSingle step occurring in cpu
22
ADDDSB3 state address line
23
DODSB3 state data line
24
02cpu phase 2 clock
25
01cpu phase 1 clock
26
PHLDAcpu ack DMA hold
27
PWAITcpu ack wait state
28
PINTEcpu indicates interrupts enabled
29
A5address bit 5
30
A4address bit 4
31
A3address bit 3
32
A15address bit 15
33
A12address bit 12
34
A9address bit 9
35
D01data line output 1
36
D00data line output 0
37
A10address bit 10
38
D04data line output 4
39
D05data line output 5
40
D06data line output 6
41
DI2data line input 2
42
DI3data line input 3
43
DI7data line input 7
44
SMIcpu fetching instruction
45
SOUTcpu output cycle
46
SINPcpu input cycle
47
SHEMRcpu in memory read cycle
48
SHLTAcpu halted for DMA
49
CLOCbuffered 2mhz clock for board use
50
GNDGround
51
+8videntical to pin 1
52
-16vunregulaged -16v power
53
SSWSBsense switch disable
54
EXTCLRclear front panel
55
(no use)
56
(no use)
57
(no use)
58
(no use)
59
(no use)
60
(no use)
61
(no use)
62
(no use)
63
(no use)
64
(no use)
65
(no use)
66
(no use)
67
(no use)
68
MWRTwrite data out bus to memory
69
PSprotect memory
70
PROTset memory protect flip flop
71
RUNcpu not in single step mode
72
PRDYnot in wait state
73
PINTinterrupt request
74
PHOLDhold state occurs
75
PRESETsystem reset
76
PSYNCnew machine cycle begins
77
PWRwrite output bus data to memory or i/o
78
PDBINinput data bus to cpu
79
A0address line 0
80
A1address line 1
81
A2address line 2
82
A6address line 6
83
A7address line 7
84
A8address line 8
85
A13address line 13
86
A14address line 14
87
A11address line 11
88
D02output data line 2
89
D03output data line 3
90
D07output data line 7
91
DI4data input line 4
92
DI5data input line 5
93
DI6data input line 6
94
DI1data input line 1
95
DI0data input line 0
96
SINTAcpu ack interrupt
97
SWOwrite to memory or i/o
98
SSTACKaddress bus contains stack address
99
POCpower on clear and reset
100
GNDground