When the address bus matches the breakpoint address, the CPU’s memory transfer acknowledge signal is withheld, effectively pausing the CPU. A poor-man’s breakpoint system is implemented by setting a breakpoint address with panel switches. From left to right, the debugging information shows the current state of the CPU address bus, data bus in, data bus out, address strobes, previous address, and breakpoint address. It offers a significant power bump over the M1 version, and even more gains over. But for most people, the M2 version will suffice. This debug overlay is possible because a pixel-doubled 512 x 342 Mac image conveniently leaves some extra vertical space on a 1024 x 768 VGA display. In essence, the Mac Mini M2 replaced my main computer for work. Below the Macintosh screen region, hardware debugging information is displayed in green. Because there’s no keyboard support yet, the document was created on another computer and added to the Plus Too boot disk image. The screenshot above shows a Mac Write document opened with Plus Too. If you’re new to Plus Too, please begin by reading the project summary page. Since then I’ve been getting many inquiries, and because not everyone’s been following the project since its beginning, I’ve created a Plus Too project summary page to document the progress so far and my plans for the next version. The project reached a major milestone yesterday, booting to the Finder for the first time, and running several programs. Plus Too is a home-made replica of a classic Macintosh computer using an FPGA.
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