What It Does

The Pi Interface HAT replaces the Macintosh SE logic board with a Raspberry Pi 4. It drives the original CRT at 512×342 via DPI mode, routes I2S audio to the original speaker cavity, and runs Mac OS 7.5.5 through Basilisk II.

Your Mac SE becomes a fully functional System 7.5 machine — with the original screen, original sound, and original feel.

Why It's Unique

• Only solution that preserves the original CRT with correct 60.15 Hz timing
• Real Mac OS 7.5.5 — not a screensaver or video loop
• Minimal wiring — just 2 connectors + power
• Open-source hardware (CERN OHL v2)
• Full kit — PCB, all components, and hardware included

Kit Contents

PCB

65 × 56 mm, 2-layer

U1

74HCT04 Hex Inverter (DIP-14)

U2

74HC245 Bus Transceiver (DIP-20)

J2

Molex Micro-Fit 3.0 2×7 header

C1–C4

100nF ceramic caps (0805)

C5

470µF electrolytic cap

R1–R2

100K resistors (0805)

FB1

Ferrite bead, 600Ω @ 100 MHz

J1

2×20 GPIO socket for Raspberry Pi

J3, J4

Pin headers (audio amp + speaker)

Hardware

4× M2.5 standoffs + 8× screws

Specifications

Board Size	65 × 56 mm
Layers	2
Power	5V from Mac SE analog board PSU (no external supply needed)
Video	512×342 @ 60.15 Hz, 1-bit, via Pi DPI
Audio	I2S via MAX98357A to speaker
CRT Connector	Molex Micro-Fit 3.0, 2×7 (14 pin)
Level Shifting	3.3V → 5V via 74HCT04 + 74HC245
License	CERN OHL v2 (open source)

Pricing

~10 kits available in the first batch. Includes PCB and all components — you solder everything (SMD and through-hole). See the assembly guide for details.

Raspberry Pi 4 and Mac SE not included. Molex cable salvaged from original logic board.

Online ordering coming soon. Email rob@sadmacs.com to reserve a kit.

Assembly & Installation Guide

Read the Full Guide →