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$7 MicroMac project recreates a Macintosh 128k on the Raspberry Pi Pico
The original Macintosh computer, quickly renamed to the Macintosh 128k, sold for $2,495 (£1,969) when it launched in 1984. Now, thanks to the Raspberry Pi Pico and one dedicated maker, you can build your own for less than $6.34 (£5).
Matt Evans developed the project over an undisclosed amount of time. He was inspired by a conversation about building a desktop GUI for the Raspberry Pi Pico’s RP2040 MCU. He’d commented on running an old operating system instead, and the original Macintosh came to mind.
When it debuted in 1984, the Macintosh only had 128KB of RAM. Within months, Apple quadrupled that and released the Macintosh 512K. The original model was rebranded the Macintosh 128K. It came bundled with MacWrite and MacPaint. Eventually, software such as MacProject, MacTerminal, and Microsoft Word were released for the computer. When the Macintosh 512K was released, Apple soon offered the vector graphics drawing software MacDraw.
Evans’s goal was to bring the Macintosh 128K to life to run the originally bundled software and the all-important Missile Command. If he could pull it off, he’d also hoped to run MacDraw on his budget Macintosh. While putting together the hardware for the job was easy enough, getting it to run the Macintosh operating system took some doing.
The Raspberry Pi Pico MicroMac build (Image credit: Matt Evans)
Along the way, Evans developed three software projects: a Mac emulator he named umac, the pico-mac project to embed the umac emulator on the Pico, and the means to connect to a monitor and USB keyboard and mouse. For hardware, he used the Raspberry Pi Pico with three series resistors, a VGA connection, and DC power. He also used a USB OTG micro-B to A adapter for connecting a USB keyboard and mouse.
After a fair bit of trial and error, reverse engineering, and hacking various registers and variables in the Macintosh System 3.2 operating system, Evans had accomplished what he set out to do. Embedded into a Raspberry Pi Pico, the Pico MicroMac runs the original Macintosh operating system, MacWrite, MacDraw, and Missile Command.
Image 1 of 5
Early work on emulating the Macintosh 128K on Raspberry Pi Pico
(Image credit: Matt Evans)
Playing Missile Command on the Pico MicroMac
(Image credit: Matt Evans)
The Pico MicroMac workstation
(Image credit: Matt Evans)
Using MacDraw on the Pico MicroMac
(Image credit: Matt Evans)
Using MacWrite on the Pico MicroMac
(Image credit: Matt Evans)
Defaults to 128K of RAM, but will run as a Mac 512K by changing a #define(RAM_SIZE).
His project does not support:
IWM/realistic floppy drives
More than one disc, or runtime image-switching
Sound (a lot of work for a beep)
VIA timers (Space Invaders runs too fast, probably because of this)
Serial/printer/Appletalk
Framebuffer switching: the Mac supports double-buffering by moving the base of screen memory via the VIA (ha), but I haven't seen anything using it. Easy to add.
Disc writes (easy to enable, untested). I didn't need to save my MacWrite essays so far.
Notes on building the hardware for the Pico MicroMac (Image credit: Matt Evans)
Evans provides instructions to build the Pico MicroMac on the Github project page. He does warn potential builders, though, that a lack of soldering skills could lead to a zapped mouse. Nevertheless, it’s a great use for a Pico and demonstrates just how fast microcontrollers have come.
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Jeff Butts has been covering tech news for more than a decade, and his IT experience predates the internet. Yes, he remembers when 9600 baud was “fast.” He especially enjoys covering DIY and Maker topics, along with anything on the bleeding edge of technology.
If you want to experience the nostalgia of working on a Macintosh 128K, you can build one for less than the cost of lunch,
If you just want the experience you can just run an emulator on your PC, running it on a pico with a normal usb keyboard and mouse is not going to add anything to the nostalgia.
According to Andy Hertzfeld the Macintosh used for the introduction demo on January 24, 1984, was a prototype with 512k RAM, even though the first model offered for sale implemented just 128k of non-expandable memory. This prototype was used to provide adequate RAM to run the memory-intensive demo, which showcased speech synthesis software intended to impress the crowd.
If you just want the experience you can just run an emulator on your PC, running it on a pico with a normal usb keyboard and mouse is not going to add anything to the nostalgia.
In a way or another you obtain the result. But what is the sense of spend hundreds of $ on a PC when you can use smaller and cheaper Raspberry ?
