Computer buses and slots connectors pinouts  > Sun pinouts
SBus is a computer bus system that was used in most SPARC-based computers from Sun Microsystems during the 1990s

It was introduced in 1989 to be a high-speed bus counterpart to their high-speed SPARC processors, replacing the earlier (and by this time, outdated) VMEbus that had been used in their earlier Motorola 68030-based systems and early SPARC boxes. When Sun was attempting to open the SPARC in the early 1990s, SBus was likewise standardized and became IEEE-1496. In 1997 Sun started to migrate away from SBus onto PCI, and today SBus is no longer used.

SBus is in many ways a clean design. It was targeted only to the SPARC so many cross-platform issues were simply not a consideration. SBus was based on a big-endian 32-bit address and data bus, run at 25MHz and thus transfers up to 100Mbyte/second. Devices are each mapped onto a 28-bit address space (16 megabytes), and only eight masters are supported although there are an unlimited number of slaves.

When the 64-bit UltraSPARC was introduced SBus was modified to use clock-doubling and transfer two 32-bit data words per cycle to produce a 200MByte/s 64-bit bus. For contrast, modern 66MHz/64-bit PCI is 528MByte/s.

SBus was a peripheral interconnect only (like PCI). Sun systems used another standardized system as a CPU-memory bus, MBus.

Pin Name Description
1 GND Ground
2 sb_br* sb_br
3 sb_sel* sb_sel
4 sb_irql* ?
5 sb_d(0) Data bit 0
6 sb_d(2) Data bit 2
7 sb_d(4) Data bit 4
8 sb_irq2* Interrupt Request 2
9 sb_d(6) Data bit 6
10 sb_d(8) Data bit 8
11 sb_d(10) Data bit 10
12 sb_irq3* Interrupt Request 3
13 sb_d(12) Data bit 12
14 sb_d(14) Data bit 14
15 sb_d(16) Data bit 16
16 sb_irq4* Interrupt Request 4
17 sb_d(19) Data bit 19
18 sb_d(21) Data bit 21
19 sb_d(23) Data bit 23
20 sb_irq5* Interrupt Request 5
21 sb_d(25) Data bit 25
22 sb_d(27) Data bit 27
23 sb_d(29) Data bit 29
24 sb_irq6* Interrupt Request 6
25 sb_d(31) Data bit 31
26 sb_siz(0) sb_siz(0
27 sb_siz(2) sb_siz(2
28 sb_irq7* Interrupt Request 7
29 sb_a(0) Address bit 0
30 sb_a(2) Address bit 2
31 sb_a(4) Address bit 4
32 sb_merr* sb_merr
33 sb_a(6) Address bit 6
34 sb_a(8) Address bit 8
35 sb_a(10) Address bit 10
36 sb_err* sb_err
37 sb_pa(12) Address bit 12
38 sb_pa(14) Address bit 14
39 sb_pa(16) Address bit 16
40 sb_ack8* sb_ack8
41 sb_pa(18) Address bit 18
42 sb_pa(20) Address bit 20
43 sb_pa(22) Address bit 22
44 sb_ack32* sb_ack32
45 sb_pa(24) Address bit 24
46 sb_pa(26) Address bit 26
47 N/C Not connected
48 -12V -12 VDC
49 sb_clk Clock
50 sb_bg* sb_bg
51 sb_as* sb_as
52 GND Ground
53 sb_d(1) Data bit 1
54 sb_d(3) Data bit 3
55 sb_d(5) Data bit 5
56 +5V +5 VDC
57 sb_d(7) Data bit 7
58 sb_d(9) Data bit 9
59 sb_d(11) Data bit 11
60 GND Ground
61 sb_d(13) Data bit 13
62 sb_d(15) Data bit 15
63 sb_d(17) Data bit 17
64 +5V +5 VDC
65 sb_d(18) Data bit 18
66 sb_d(20) Data bit 20
67 sb_d(22) Data bit 22
68 GND Ground
69 sb_d(24) Data bit 24
70 sb_d(26) Data bit 26
71 sb_d(28) Data bit 28
72 +5V +5 VDC
73 sb_d(30) Data bit 30
74 sb_siz(1) sb_siz(1
75 sb_rd sb_rd
76 GND Ground
77 sb_a(1) Address bit 1
78 sb_a(3) Address bit 3
79 sb_a(5) Address bit 5
80 +5V +5 VDC
81 sb_a(7) Address bit 7
82 sb_a(9) Address bit 9
83 sb_a(11) Address bit 11
84 GND Ground
85 sb_pa(13) Address bit 13
86 sb_pa(15) Address bit 15
87 sb_pa(17) Address bit 17
88 +5V +5 VDC
89 sb_pa(19) Address bit 19
90 sb_pa(21) Address bit 21
91 sb_pa(23) Address bit 23
92 GND Ground
93 sb_pa(25) Address bit 25
94 sb_pa(27) Address bit 27
95 sb_reset* Reset
96 +12V +12 VDC

 

96 pin male or female (Fujitsu FCN 234P096-G/Y) connector layout
96 pin male or female (Fujitsu FCN 234P096-G/Y) connector
at the motherboard
According to 2 reports in our database (1 positive and 0 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information: SUN SPARCengine 5 manual at SUN manuals site, wikipedia.org, from Hardware Book
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