SD Systems S-100 bus

Another version of S-100 bus.

Pinout

 1     (Component side)      50
###### ==================
 100     (Solder side)       51

Pin	Name	Type	Dir	Description
1	+8 V	Power	→	+8 Volts
2	+16 V	Power	→	+18 Volts
3		Fr panel	→	External Ready To Processor
4	NMI	Control	←	Vector Interrupt Line 0
5	V11	Control	←	Vector Interrupt Line 1
6	V12	Control	←	Vector Interrupt Line 2
7	V13	Control	←	Vector Interrupt Line 3
8	V14	Control	←	Vector Interrupt Line 4
9
10
11
12
13
14	IE
15	ZC1 to 0
16	ZC1 to 1
17	ZC1 to 3
18
19	CSA-DSBL	Control	←	Disable Processor Control Lines
20	GND	Power	─	Ground
21
22
23
24	phi2	Clock	→	Primary Processor Clock Line
25	phi1	Clock	→	"Inversion" Of Phase 2 Processor Clock Line
26	PHLDA	Control	→	Processor In Hold Condition
27	PWAIT	Control	→	Processor In Wait Condition
28
29	A5	Address	→	Address Line 5
30	A4	Address	→	Address Line 4
31	A3	Address	→	Address Line 3
32	A15	Address	→	Address Line 15
33	A12	Address	→	Address Line 12
34	A9	Address	→	Address Line 9
35	DO1	Data	→	Data Output Line 1
36	DO0	Data	→	Data Output Line 0
37	A10	Address	→	Address Line 10
38	DO4	Data	→	Data Output Line 4
39	DO5	Data	→	Data Output Line 5
40	DO6	Data	→	Data Output Line 6
41	DI2	Data	←	Data Input Line 2
42	DI3	Data	←	Data Input Line 3
43	DI7	Data	←	Data Input Line 7
44	SM1	State	→	Processor Instruction Fetch Signal
45	SOUT	State	→	Processor I/O Write Signal
46	SINP	State	→	Processor I/O Read Signal
47	SMEMR	State	→	Processor Memory Read Signal
48	SHLTA	State	→	Processor Halted Signal
49	CLOCK	Clock	→	2Mhz Clock Signal
50	GND	Power	─	Logical And Power Ground
51	+8V	Power	→	+8 Volts
52	-16V	Power	→	-18 Volts
53
54
55
56
57
58
59
60
61
62
63
64	IEO
65
66	/PRFSH	Control	→	Z80 Processor Dram Refresh
67	/PHANTOM		↔	Disables normal slave devices and enables phantom slaves (primarily used for bootstrapping systems without hardware front panels).
68	MWRITE	Ctrl/frp	→	Memory Write From Processor Or Front Panel
69
70	GND	Power	─	Ground
71
72	PRDY	Control	←	Controls Run/Wait State Of Processor
73	/PINT	Control	←	Request For Interrupt To Processor
74	/PHOLD	Control	←	Request For Hold To Processor
75	/PRESET	Control	←	Forces Processor To Reset State
76	PSYNC	Control	→	Marks Beginning Of Each Processor Cycle
77	/PWR	Control	→	Active When Processor Writes (I/O Or Memory)
78	PDBIN	Control	→	Active When Processor Reads (I/O Or Memory)
79	A0	Address	→	Address Line 0
80	A1	Address	→	Address Line 1
81	A2	Address	→	Address Line 2
82	A6	Address	→	Address Line 6
83	A7	Address	→	Address Line 7
84	A8	Address	→	Address Line 8
85	A13	Address	→	Address Line 13
86	A14	Address	→	Address Line 14
87	A11	Address	→	Address Line 11
88	DO2	Data	→	Data Output Line 2
89	DO3	Data	→	Data Output Line 3
90	DO7	Data	→	Data Output Line 7
91	DI4	Data	←	Data Input Line 4
92	DI5	Data	←	Data Input Line 5
93	DI6	Data	←	Data Input Line 6
94	DI1	Data	←	Data Input Line 1
95	DI0	Data	←	Data Input Line 0
96	SINTA	Control	→	Acknowledge Signal For Pint Request
97
98
99	/POC	Ft panel	→	Power-On Clear Signal
100	GND		─	Power And Signal Ground

Note: Direction is CPU/Frontpanel relative cards.

Contributors

User:Joakim:Joakim Ögren

Sources

List of Altair/IMSAI S100 signals by Herb Johnson
S-100 and IEEE-696 Bus List by Herbert R. Johnson

SD Systems S-100 bus

Pinout

See also

Contributors

Sources