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 Power supply?
An expanded view of the SE's components, with part numbers.
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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