| Pin
| Name
| Description |
|---|
| 1 | PR +24V EXT | Raw +24 V from AC adapter |
| 2 | PR +24V EXT | Raw +24 V from AC adapter |
| 3 | /PLUG IN | Power surge control (grounded in the expansion device) |
| 4 | GND | Logic ground |
| 7 | /ON/OFF OUT | On/off button |
| 9 | /STERM | Synchronous termination |
| 10 | /DS | Data strobe |
| 11 | /AS | Address strobe |
| 12 | +5V MAIN OUT | +5 V regulated power |
| 13 | /HALT | Halt |
| 14 | /BERR | Bus error |
| 15 | /BGACK | Bus grant acknowledge |
| 19 | GND | Logic ground |
| 20 | GND | Logic ground |
| 21 | ADDR[0] | Address bit 0 |
| 22 | ADDR[2] | Address bit 2 |
| 23 | ADDR[4] | Address bit 4 |
| 24 | ADDR[6] | Address bit 6 |
| 25 | ADDR[8] | Address bit 8 |
| 26 | ADDR[10] | Address bit 10 |
| 27 | ADDR[12] | Address bit 12 |
| 28 | ADDR[14] | Address bit 14 |
| 29 | +5V MAIN OUT | +5 V regulated power |
| 30 | GND | Logic ground |
| 31 | ADDR[18] | Address bit 18 |
| 32 | ADDR[20] | Address bit 20 |
| 33 | ADDR[22] | Address bit 22 |
| 34 | ADDR[24] | Address bit 24 |
| 35 | ADDR[26] | Address bit 26 |
| 36 | ADDR[28] | Address bit 28 |
| 37 | ADDR[30] | Address bit 30 |
| 38 | GND | Logic ground |
| 39 | GND | Logic ground |
| 40 | IOCLK | 15.6672 MHz I/O clock |
| 41 | SIZ[1] | Transfer size bit 1 |
| 42 | +5V MAIN OUT | +5 V regulated power |
| 43 | DATA[0] | Data bit 0 |
| 44 | DATA[1] | Data bit 1 |
| 45 | DATA[2] | Data bit 2 |
| 46 | DATA[3] | Data bit 3 |
| 47 | DATA[4] | Data bit 4 |
| 48 | DATA[5] | Data bit 5 |
| 49 | DATA[6] | Data bit 6 |
| 50 | DATA[7] | Data bit 7 |
| 51 | GND | Logic ground |
| 52 | DATA[17] | Data bit 17 |
| 53 | DATA[18] | Data bit 18 |
| 54 | DATA[19] | Data bit 19 |
| 56 | DATA[20] | Data bit 20 |
| 57 | DATA[21] | Data bit 21 |
| 58 | DATA[22] | Data bit 22 |
| 59 | DATA[23] | Data bit 23 |
| 61 | GND | Logic ground |
| 62 | /SCC IRQ | SCC interrupt request |
| 63 | SERVEE | -5 V for SCC transceivers |
| 65 | GND | Logic ground |
| 66 | GND | Logic ground |
| 67 | +8V SOUND | Special "clean" +8 V power for sound output |
| 68 | +5V MODEM | +5 V power for modem |
| 69 | LINET/R | Modem DAA line talk/receive |
| 70 | +5V SOUND | +5 V power for sound output |
| 72 | SND OUT L | Sound output left channel |
| 73 | EXT MIC FILT R | Right input signal from external microphone |
| 74 | EXT MIC FILT L | Left input signal from external microphone |
| 75 | DAA GND | Modem ground |
| 76 | DAA GND | Modem ground |
| 77 | PR +24V EXT | Raw +24 V from AC adapter |
| 78 | PR +24V EXT | Raw +24 V from AC adapter |
| 79 | PR +24V EXT | Raw +24 V from AC adapter |
| 80 | GND | Logic ground |
| 81 | GND | Logic ground |
| 83 | ADB DATA | Apple Desktop Bus data |
| 84 | /ADBPWRON | ADB power-on key |
| 86 | /CBREQ | Cache burst request |
| 87 | /DSACK1 | Data size acknowledge bit 1 |
| 88 | /DSACK0 | Data size acknowledge bit 0 |
| 89 | /BR | Bus request |
| 90 | /BG | Bus grant |
| 91 | /SLEEP | Sleep-state signal |
| 92 | FC[1] | Function code bit 1 |
| 93 | FC[0] | Function code bit 0 |
| 94 | /RMC | Read-modify-write cycle |
| 95 | CPUCLK | CPU bus clock |
| 96 | /CPURESET | CPU reset (bus invalid) |
| 97 | ADDR[1] | Address bit 1 |
| 98 | ADDR[3] | Address bit 3 |
| 99 | ADDR[5] | Address bit 5 |
| 100 | ADDR[7] | Address bit 7 |
| 101 | ADDR[9] | Address bit 9 |
| 102 | ADDR[11] | Address bit 11 |
| 103 | ADDR[13] | Address bit 13 |
| 104 | ADDR[15] | Address bit 15 |
| 105 | ADDR[16] | Address bit 16 |
| 106 | ADDR[17] | Address bit 17 |
| 107 | ADDR[19] | Address bit 19 |
| 108 | ADDR[21] | Address bit 21 |
| 109 | ADDR[23] | Address bit 23 |
| 110 | ADDR[25] | Address bit 25 |
| 111 | ADDR[27] | Address bit 27 |
| 112 | ADDR[29] | Address bit 29 |
| 113 | ADDR[31] | Address bit 31 |
| 114 | /SLOT IN | Expansion device plugged in grounds pin |
| 115 | GND | Logic ground |
| 116 | RD | Read/Write |
| 117 | SIZ[0] | Transfer size bit 0 |
| 118 | DATA[8] | Data bit 8 |
| 119 | DATA[9] | Data bit 9 |
| 120 | DATA[10] | Data bit 10 |
| 121 | DATA[11] | Data bit 11 |
| 122 | +5VEXTSENSE | +5 V external sense |
| 123 | DATA[12] | Data bit 12 |
| 124 | DATA[13] | Data bit 13 |
| 125 | DATA[14] | Data bit 14 |
| 126 | DATA[15] | Data bit 15 |
| 127 | DATA[16] | Data bit 16 |
| 128 | DATA[24] | Data bit 24 |
| 129 | DATA[25] | Data bit 25 |
| 130 | DATA[26] | Data bit 26 |
| 131 | DATA[27] | Data bit 27 |
| 132 | DATA[28] | Data bit 28 |
| 133 | DATA[29] | Data bit 29 |
| 134 | DATA[30] | Data bit 30 |
| 135 | DATA[31] | Data bit 31 |
| 137 | /SWIM CS | SWIM chip select |
| 138 | /SLOT E IRQ | Pseudo-NuBus expansion slot E interrupt |
| 139 | /PFW | Power fail warning (shutdown bit) |
| 140 | /IO RESET | Reset output to I/O systems |
| 141 | GND | Logic ground |
| 142 | GND | Logic ground |
| 143 | DAA CNTLF | Modem DAA control |
| 144 | DAA ID IN | ID input from 152-pin connector to modem card |
| 145 | /RING DET | Ring detect signal from the modem DAA |
| 146 | /RB DVR | Modem relay B driver |
| 147 | /RA DVR | Modem relay A driver |
| 148 | EXT MIC SEL | External microphone plugged in |
| 151 | DAA GND | Modem ground |
| 152 | DAA GND | Modem ground |
