Serial interfaces | Signal Name / Mnemonic; |  |  |  |  |  | V.35 | EIA/RS 449 | EIA/RS
530 | RS 232 | RS 232 | Shield | A | 1 | 1 | 1 |
| Signal Ground | B | 19 | 7 | 7 | 5 | Data Terminal ready (DTR
A) | H | 12 | 20 | 20 | 4 |
Data Set Ready (DSR A) | E | 11 | 6 | 6 | 6 | Carrier Detect (DCD A) |
F | 13 | 8 | 8 | 1 | Request to Send (RTS
A) | C | 7 | 4 |
4 | 7 |
Clear To Send (CTS A) | D | 9 |
5 | 5 | 8 |
Transmit Data (TXD A) | P | 4 | 2 | 2 | 3 | Transmit Timing (TXC A) |
Y | 5 | 15 | 15 | | Receive Data (RXD A) |
R | 6 | 3 | 3 | 2 |
Receive Timing (RXC A) | V | 8 |
17 | 17 | |
Terminal Timing (TT A) | U | 17 | 24 | 24 |
| Data Terminal ready (DTR B) |
| 30 | 23 |
| | Data Set Ready (DSR B) |
| 29 | 22 |
| | Carrier Detect
(DCD B) | | 31 | 10 |
| | Request To Send (RTS B) |
| 25 | 19 | 19 | | Clear To
Send (CTS B) | | 27 | 13 | 13 | |
Transmit Data (TXD B) | S | 22 |
14 | 14 | | Transmit Timing (TXC B) | AA | 23 | 12 | | |
Receive Data (RXD B) | T | 24 | 16 | 16 |
| Receive Timing (RXC B) | X | 26 | 9 |
| | Terminal Timing (TT B) | W | 35 | 11 |
| | Local Loopback
(LL) | L, K | 10 | 18 | | | Remote
Loopback (RLB) | N | 14 | 21 | | |
Loss of Sync (LOS)(Unbalanced) | | 36 | | | |
Loss of Sync (LOS A) | | 3 |
| | |
Loss of Sync (LOS B) | | 21 |
| | | SCSI Single
End | Signal Name /Mnemonic |
 |  |  |  |  | DB25* | ID50 | CN50 |
DM50 | DM68 | D0 | 8 | 2 |
26 | 26 | 40 |
D1 | 21 | 4 | 27 | 27 | 41 |
D2 | 22 | 6 | 28 | 28 | 42 | D3 | 10 | 8 | 29 | 29 | 43 | D4 | 23 | 10 | 30 | 30 | 44 | D5 | 11 | 12 | 31 | 31 | 45 |
D6 | 12 | 14 | 32 | 32 | 46 |
D7 | 13 | 16 | 33 | 33 | 47 |
D8 | | |
| | 65 | D9 |
| | | | 66 | D10 | |
| | | 67 |
D11 | | | |
| 68 |
D12 | | | | |
35 | D13 | |
| | | 36 |
D14 | | |
| | 37 |
D15 | | | | |
38 | DParity | 20 | 18 | 34 | 34 | 48 | DParityH |
| | | | 39 | Terminator Power | 25 | 26 | 38 | 38 | 17, 18, 51, 52 |
ATN | 17 | 32 | 41 | 41 | 55 |
BSY | 6 | 36 | 43 | 43 | 57 | ACK | 5 | 38 | 44 | 44 | 58 | RST | 4 | 40 | 45 | 45 | 59 | MSG | 2 | 42 | 46 | 46 | 60 |
SEL | 19 | 44 | 47 | 47 | 61 |
C/D | 15 | 46 | 48 | 48 | 62 |
REQ | 1 | 48 | 49 | 49 | 63 | I/O | 3 | 50 | 50 | 50 | 64 | Ground | 7, 9, 14, 16, 18, 24 | 1, 3, 5, 7, 9,
11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39,
41, 43, 45, 47, 49 | 1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
24, 25 | 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 | 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
33, 34, 49, 50, 54, 56 | *Some older equipment
with DB25s will have a different pinout, but all Apple equipment followed this
pinout | SCSI Differential | Signal Name /Mnemonic |  |  |  |  | ID50 | CN50 | DM50 | DM68 | D0+ | 3 | 2 | 2 | 7 | D0- | 4 | 27 | 27 | 41 | D1+ | 5 | 3 | 3 | 8 | D1- | 6 | 28 |
28 | 42 | D2+ | 7 | 4 | 4 | 9 | D2- | 8 | 29 | 29 | 43 | D3+ | 9 | 5 | 5 | 10 | D3- | 10 | 30 |
30 | 44 | D4+ | 11 | 6 | 6 | 11 | D4- | 12 | 31 | 31 | 45 | D5+ | 13 | 7 | 7 | 12 | D5- | 14 | 32 |
32 | 46 | D6+ | 15 | 8 | 8 | 13 | D6- | 16 | 33 | 33 | 47 | D7+ | 17 | 9 | 9 | 14 | D7- | 18 | 34 |
34 | 48 | D8+ | | | | 31 |
D8- | | | | 65 | D9+ | | | | 32 |
D9- | | | | 66 | D10+ | | | | 33 |
D10- | | | | 67 | D11+ | | | | 34 |
D11- | | | | 68 | D12+ | | | | 1 |
D12- | | | | 35 | D13+ | | | | 2 |
D13- | | | | 36 | D14+ | | | | 3 |
D14- | | | | 37 | D15+ | | | | 4 |
D15- | | | | 38 | DParity+ |
19 | 10 | 10 | 15 | DParity- | 20 | 35 | 35 | 49 | DParityH+ | |
| | 5 | DParityH- | | | | 39 | Terminator
Power | 26 | 38 | 38 | 52 |
ATN+ | 29 | 15 | 15 | 20 | ATN- | 30 | 40 | 40 | 54 | BSY+ | 33 | 17 | 17 | 22 | BSY- | 34 | 42 | 42 | 56 |
ACK+ | 35 | 18 | 18 | 23 |
ACK- | 36 | 43 | 43 | 57 |
RST+ | 37 | 19 | 19 | 24 | RST- | 38 | 44 | 44 | 58 | MSG+ | 39 | 20 | 20 | 25 | MSG- | 40 | 45 | 45 | 59 |
SEL+ | 41 | 21 | 21 | 26 |
SEL- | 42 | 46 | 46 | 60 |
C/D+ | 43 | 22 | 22 | 27 | C/D- | 44 | 47 | 47 | 61 | REQ+ | 45 | 23 | 23 | 28 | REQ- | 46 | 48 | 48 | 62 |
I/O+ | 47 | 24 | 24 | 29 |
I/O- | 48 | 49 | 49 | 63 |
Ground | 2, 22, 23, 24, 27, 28, 31, 32,
49, 50 | 12, 14, 16, 25, 26, 36, 37, 39,
41, 50 | 12, 14, 16, 25, 26, 36, 37, 39,
41, 50 | 17, 19, 21, 30, 31, 50, 51, 53,
56, 64 |
|