Shared Projects by Tobrew

Turn a Maclock (a simple alarm clock inside a shockingly accurate miniature Macintosh shell) into a working Mac using a Raspberry Pi Zero. Buttons, brightness, sound, and battery all work.

The board is tested and works.

Expansion card that adds an MC68882 FPU to your Macintosh Classic II. The board has two layers to keep the PCB cost down. It offers a switchable clock source between the system clock (16 MHz, synchronous operation) and a crystal oscillator on the board (20,32, or 40 MHz, asynchronous operation depending on your crystal and FPU chip. If you just want a stock 16MHz FPU, leave off the oscillator and use a MC68882FN16A chip). If you want to overclock, use a faster FPU chip such as a MC68882FN40A, and the appropriate oscillator. It has been shown that the FPU can be overclocked up to 40MHz, but based on experience, keeping it around 25-33MHz maintains better CPU performance.

Project by Marcin Dymczyk, Modifications by me

BlueSCSI provides a convenient way to use MicroSD cards as hard drives in your Vintage Macintosh or workstation.

This DB25 variant plugs right into the external port of your vintage computer such as Macintosh plus, SE, Classic, Classic II, and Color Classic.

Commodore 64 PLA replacement board using 2 Lattice GAL20V8B-25 ICs. Original Open Source Design by Daniel Mantione

Direct replacement for the 906114-01 PLA chip

Designed to be plugged into a socket, not to be soldered directly to the PCB. Works on all C64 motherboards. Works with Super Zaxxon, Epyx fast load, custom and alternative KERNALS

The GAL20V8B-25 ICs can be programmed with TL866 programmer.

The required fusemaps and more information are available here: https://www.freepascal.org/~daniel/c64pla/

Parts: GAL20V8B-25LP x 2
Male round pin header 14 pin x 2
IC socket 24 pin x 2

The DRAMduino

The DRAMTester shield is an Arduino UNO shield , to test 4164 and 41256 DRAM. It checks the DRAM with different read/write operations and is based on the work on https://forum.defence-force.org/viewtopic.php?t=1699.

4164 DRAM is found in retro computers such as the Commodore 64, Atari 800XL, Tandy TRS-80, and Acorn Electron.