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Macintosh SE/30

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A popular system for hobbyists due to the compact size and expansion capabilities. The SE/30 is powered by a Motorola 68030 at 16MHz with FPU. The system is known to support up to 128MB memory, though you will either need a 32-bit clean ROM or run with 32-bit addressing enabled in the software side.

Replaces the Macintosh SE model which was based on the Motorola 68000 CPU.


There is a single "SE/30 PDS" expansion port, though you are able to get creative with PDS adapters in order to fit multiple expansion cards inside the chassis. Ethernet is probably one of the most popular options, along with CPU accelerators.


Jittery Video

Description: This common problem is not mentioned on the RMS webpage. It's usually caused by problems in the 4 pin connector (marked "P5" on the analog card) interface between the analog card and the CRT yoke. One or more pins in the analog card connector develop bad solder joints. A bad solder joint can cause excessive heating which causes heat corrosion in the associated pins within the 2 connectors. The heat corrosion will cause discoloration of the white connector shells.


  1. Verify that the lug of the black/white ground wire from the CRT neck video card is firmly screwed down.
  2. If it is loose, tighten the screw and retest before doing following steps.
  3. On analog card, remove old solder from all 4 pin connections and resolder all 4 pins.
  4. If there is connector discoloration: Identify which pin pair is closest to discoloration. Scrape down the male pin with sharp pointed xacto knife blade. Use tweezers or needle nose pliars to compress the female pin so that has tighter grip on male pin.

Replacement Tantalum Capacitors

         (microFarads)   (VDC)       CODE       PART NUMBER

              1.0         50 <--(ORIGINAL PART RATING)
              1.0         35          B         TAJB105K035R     AVX
C6            1.0         25          B         293D105X9025B2T  Sprague
              1.0         35          B         293D105X9055B2T  Sprague
              1.0         25          B         T491A105K025AS   Kemet
              1.0         35          B         T491B105M035AS   Kemet

C1,C3          47         16 <--(ORIGINAL PARTS RATING)
C4,C5          47         16          C         (Available)
C7,C8          47         16          D         293D476X9016D2T  Sprague
C9,C10         47         16          D         T491D476K016AS   Kemet
C12,C13        47         16          D         ECS-T1CD476R     Panasonic

CASE     EIA       Length      Width

 A       3216      0.126 "     0.063 "
                    3.2 mm      1.6 mm
 B       3528      0.138       0.110
                    3.5         2.8
 C       6032      0.236       0.126
                    6.0         3.2
 D       7343      0.287       0.170
                    7.3         4.3


Press the interrupt switch on the side of the computer and type dm 4082E853 20 into the message box and press return. This will return the message "WHAT ARE YOU STARING AT?"


040et stack.gif 030egs stack.gif 030cgs stack w floppy.gif

030ecgs stack.gif Floppy-mod.gif Hd-vert.gif

Conn key.gif

How many cards can be installed in the SE/30 with only one PDS slot?

In Macintosh, six slot addresses (9, A, B, C, D, E) are assigned to the extended slots, and each extended slot has its own address space as listed below.

Therefore, the SE/30 can theoretically harbor six cards, though it has only one slot on the logic board. The problem are (1)how to install more than one card to a single PDS slot, and (2)how to supply much more power to support up to six cards.

        16M byte Standard Address Space	 256M byte Super Address Space
Slot 9	F900 0000 ~ F9FF FFFF   	9000 0000 ~ 9FFF FFFF
Slot A	FA00 0000 ~ FAFF FFFF   	A000 0000 ~ AFFF FFFF
Slot B	FB00 0000 ~ FBFF FFFF   	B000 0000 ~ BFFF FFFF
Slot C	FC00 0000 ~ FCFF FFFF   	C000 0000 ~ CFFF FFFF
Slot D	FD00 0000 ~ FDFF FFFF   	D000 0000 ~ DFFF FFFF
Slot E	FE00 0000 ~ FEFF FFFF   	E000 0000 ~ EFFF FFFF

For the PDS slot of the SE/30, a 120-pin Euro-Din connector is soldered on the logic board.


See Also