Logic board
Analog board 1 This analog board seems to be from an SE/30, but I don't think Apple changed a lot.
Analog board 2
Netzteil
This page gives the pin assignments and functions for the connectors on the back panels of the Macintosh SE and SE/30. The pinouts are the same with the exception of the audio output ports. The Macintosh SE provides a monaural signal and the Macintosh SE/30 a stereo signal. Appropriate information appears below.
Apple Desktop Bus (ADB) ----------------------- Pin Signal name Signal description 1 ADB Data 2 NC Reserved 3 +5v +5 volts DC 4 GND Signal ground - Connector type: 4-pin minicircular - Total length of all cables not to exceed 16 feet (5 meters) SCSI Port (25-pin) ------------------ Pin Signal name Signal description 1 REQ/ Request 2 MSG/ Message 3 I/O/ Input/Output 4 RST/ SCSI bus reset 5 ACK/ Acknowledge 6 BSY/ Busy 7 GND Signal ground 8 DB0/ Data bit 0 9 GND Signal ground 10 DB3/ Data bit 3 11 DB5/ Data bit 5 12 DB6/ Data bit 6 13 DB7/ Data bit 7 14 GND Signal ground 15 C/D/ Common/Data 16 GND Signal ground 17 ATN/ Attention 18 GND Signal ground 19 SEL/ Select 20 DBP/ Data parity 21 DB1/ Data bit 1 22 DB2/ Data bit 2 23 DB4/ Data bit 4 24 GND Signal ground 25 TPWR Terminator power - Connector type: DB-25 - Total length of all cables not to exceed 20 feet (6 meters) WARNING: The SCSI port uses the same type of connector as a standard RS-232, DB-25 serial interface, but it is different electrically. Do not connect any RS-232 device to this connector. Doing so can result in damage to both the device and the Macintosh. Modem and Printer Ports ----------------------- Pin Signal name Signal description 1 HSKo Handshake out 2 HSKi Handshake in/external clock 3 TXD- Transmit data - 4 GND Signal ground 5 RXD- Receive data - 6 TXD+ Transmit data + 7 GPi General purpose input* 8 RXD+ Receive data + *Modem port only. Can be set in software to be a second external clock. - Connector type: 8-pin minicircular Disk Drive Port --------------- Pin Signal name Signal description 1 GND Signal ground 2 GND Signal ground 3 GND Signal ground 4 GND Signal ground 5 -12v -12 volts DC 6 +5v +5 volts DC 7 +12v +12 volts DC 8 +12v +12 volts DC 9 NC No connection 1 PWM Motor speed control 11 PH0 Register select CA0 12 PH1 Register select CA1 13 PH2 Register select CA2 14 PH3 Register write strobe LSTRB 15 WRREQ/ Write request 16 SEL Register select line SEL 17 ENBL/ Drive enable 18 RD Read data 19 WR Write data - Connector type: DB-19 Audio Jack for the Macintosh SE ------------------------------- Pin Signal name Signal description (Sleeve) GND Signal ground (Tip) AUDIO .5 volt peak-to-peak audio signal - Connector type: Miniature mono phone plug - The internal speaker is disabled when this port is in use. Audio Jack for the Macintosh SE/30 ---------------------------------- Pin Signal name Signal description (Sleeve) GND Signal ground (Ring) RIGHT .75 volt peak-to-peak audio signal, right channel (Tip) LEFT .75 volt peak-to-peak audio signal, left channel - Connector type: Stereo miniature phone plug - The internal speaker is disabled when this port is in use.
Column Column Column
1 2 3
Row
32 -12V -5V +12V
31 Spare +12V +12V
30 Ground +12V Ground
29 D15 Ground C16M
28 D14 Ext.STK/ C8M
27 D13 Reserved E
26 D12 Reserved A23
25 D11 Reserved A22
24 D10 Reserved A21
23 D9 Reserved A20
22 D8 Spare A19
21 D7 BERR/ A18
20 D6 IPL2/ A17
19 D5 IPL1/ A16
18 D4 IPL0/ A15
17 D3 +5V A14
16 D2 +5V A13
15 D1 +5V A12
14 D0 +5V A11
13 +5V +5V A10
12 RESET/ HALT/ A9
11 PMCYC/ Reserved A8
10 AS/ Reserved A7
9 UDS/ Ground A6
8 LDS/ Ground A5
7 R/W/ Ground A4
6 DTACK/ Ground A3
5 BG/ Ground A2
4 BGACK/ Ground A1
3 BR/ Ground FC0
2 VMA/ Ground FC1
1 VPA/ Ground FC2
Here is a description of the signals in the system expansion slot.
Signal Description
FC0-FC2 68000 Function Code lines
A1-A23 68000 Address lines
E 68000 E Clock
C8M Microprocessor clock = 7.8336 MHz = C16M divided by 2.
C16M Gate Array Clock = 15.6672 MHz
HALT/ 68000 Halt. Wired directly to RESET/
IPL0/-IPL2/ 68000 Interrupt Priority Level lines
BERR/ 68000 Bus Error. Generated by gate array due to SCSI
access timeout.
Ext.DTK/ Pull low to put the gate array generated DTACK/ into a
high-impedance state. The expansion board is then
responsible for generating the DTACK/signal (as an output
to the microprocessor, throught the DTACK/signal line).
VPA/ 68000 Valid Peripheral Address. Supplied to 68000.
For Macintosh SE, VPA space is $E0 0000 to $FF FFFF.
VMA/ 68000 Valid Memory Address
BR/ 68000 Bus Request
BGACK/ 68000 Bus Grant Acknowledge
BG/ 68000 Bus Grant
DTACK/ 68000 Data Transfer Acknowledge. Inserts wait states until
data bus is available. Normally supplied by the gate array.
Gate array generation of DTACK/ can be suppressed (put into
a high-impedance state) by pulling the EXT.DTACK/line low;
this allows DTACK/ to be externally generated by an add-on
device. DTACK/ is not supplied for accesses to VPA space,
is held off to separate 2 successive accesses to the SCC and
is held off during RAM access by video.
R/W/ 68000 Read/Write
LDS/ 68000 Lower Data Strobe
UDS/ 68000 Upper Data Strobe
AS/ 68000 Address Strobe
PMCYC/ Processor-Memory Cycle. Used to synchronize with the gate
array for RAM accesses. PMCYC/ is low when RAM is available
for microporcessor accesses and is high during video acesses.
PMCYC/ is always high during SO.
RESET/ 68000 Reset. Wired directly to HALT/.
D0-D15 68000 Data Bus
Additional information may be found in the the Motorola 68000 manual.
The Mac SE Support Pages, maintained by Chris Adams
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