== Macintosh SE/30 Reloaded Logic Board ==
Macintosh SE/30 Reloaded Logic Board
Caption
Fully assembled SE/30 Reloaded Logic Board
Type
Logic Board
Designer
Community-designed (Based on original Apple design)
Manufacturer
Independent / DIY
First released
2023
Latest revision
N/A
Operating voltage
—
Layers / PCB
4-layer PCB
Compatibility
Macintosh SE/30
Features
* Modern design
SMD components
Apple ASICs
GAL-based PAL replacements
32-bit clean ROM support
Model No.
SE30RL
Overview
The Macintosh SE/30 Reloaded Logic Board is a modern open-hardware recreation of Apple’s original SE/30 logic board. Developed by the vintage computing community, it combines compatibility with the original Macintosh SE/30 and modern PCB fabrication, improving reliability and usability.
File:PCB Inspection.jpg Careful pre-inspection helps avoid soldering issues.
Quick Specs
Quick Specs
PCB Type: 4-layer with internal power/ground planes
CPU: Motorola 68030 @ 16MHz (PLCC)
FPU: Motorola 68882 (optional)
RAM: Four 30-pin SIMM slots (up to 128MB with clean ROM)
ROM: Supports original ICs or programmable ROM SIMM
I/O: Internal/External SCSI, Serial, ADB, Audio, Floppy
Preparation and Inspection
Step
Description
Cleaning
Use >90% isopropyl alcohol on both PCB sides.
Visual Inspection
Under magnification, check for shorts, broken pads, poor vias.
Dry Fit Components
Test-fit sockets, connectors, and SIMMs.
ESD Safety
Always wear a grounded wrist strap and use an anti-static mat.
Components
Tools
Apple ASICs: GLU, ASC, RTC, SWIM
Programmed GAL16V8 (x6), 27C64 Video ROM
30-pin SIMM sockets, PDS slot, headers
DB-19/25 connectors, mini-DIN ports, audio jack
Fine-tip temperature-controlled soldering iron
Hot air rework station
No-clean flux pen + gel
Leaded solder (0.5mm preferred)
Stereo microscope or magnifier lamp
Multimeter, oscilloscope
GAL and EPROM programmers
Assembly Techniques
Surface-Mount Soldering
Flux and steady hands are key!
Component
Technique
0402/0603 Passives
Tin one pad, place part, solder second pad, reflow first.
SOIC/QFP
Pin-by-pin or drag solder with flux.
PLCC
Tack corners, flow solder under leads, inspect with magnification.
Through-Hole Soldering
Through-hole connectors properly aligned. Tack two corner pins, verify alignment, solder all pins.
Trim excess leads with flush cutters.
Recommended Assembly Sequence
Power filtering, fuses, and clock oscillator
SMD passives (resistors, capacitors)
SMD logic, GALs, and custom ICs
Through-hole sockets, SIMM slots, headers
External connectors, switches, audio jack
Initial Testing
File:Bench Test Setup.jpg Current-limited bench power test Supply +5V and +12V using a current-limited bench PSU
Test voltage rails and look for excessive draw
Logic probe for clock and reset activity
Test without CPU/FPU for safety
Subsystem Test Checklist
Subsystem
Checks
CPU/ROM
Chime sound, address line activity
RAM
Detects correct amount, boots OS
Video
Raster visible, no vertical stripes (Simasimac)
ADB
Mouse/keyboard respond, LED toggles
Sound
Clear startup chime and test tones
SCSI
Boots from BlueSCSI or HDD
Floppy
Spindle motion, reads boot disks
Troubleshooting Guide
File:Diagnostic Screen.jpg Simasimac: common sign of ROM/GLU issues
Symptom
Causes
No boot or chime
No clock/reset, shorted power rail, missing GALs
Simasimac
ROM not detected, GLU issues, bad sockets
Death chimes
RAM failure, bad VIA, bad address decoding
ADB non-functional
Fuse F1 blown, missing RTC/PRAM battery
No floppy/SCSI
Bad SWIM, missing termination, F3 blown
Unique Features
Modern 4-layer PCB design
Improved component layout and silkscreen
External 3.5mm audio jack
ROM SIMM support for custom ROMs (e.g. 32-bit clean)
Durable modern connectors
Gallery
Conclusion
Building the Macintosh SE/30 Reloaded Logic Board is a rewarding challenge for vintage computing enthusiasts. It offers the joy of hands-on assembly combined with the satisfaction of breathing new life into a timeless Mac.
SMD soldering process
Through-hole alignment