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Are you running in 32-bit or 24-bit mode in these examples? You wrote that the 32-bit addressing option "appears", but was not clear to me if it actually was enabled or not. The address map (figure 3-7) represents the 32-bit "physical" address map, and the "DM" command operates on logical...

A nubus card with a pi? Interesting thought... I assume you'd need an fpga to glue the pi and bus together... Wonder if any such build already exists...

Slightly unrelated, but nevertheless: I couldn't stop myself, so I added a functional model of the 8•24 GC display card as well… The display half is a conventional register-level model (decl ROM, CRTC/CLUT/sense lines, 1/8/32 bpp). The accelerator half is high-level emulation: it doesn't...

If you toggle bit/pixel-depth under the Monitors control panel and restart, does the problem persist? (I assume the answer is "yes" - but just want to double check)

Apologies in advance if reviving a thread this old is frowned upon. My only reason for posting here is that this is the thread a person tends to land on when searching for why the System 6 version of the 8•24 GC software won't engage, so it seemed the most useful place to leave a note for anyone...

I just ran a benchmark/comparison, as you suggested: One should, of course, be very careful when drawing conclusions from a benchmark running inside an emulator - especially in this case, where the emulator is running inside my web browser. The emulator itself also skews the results a bit...

Sorry, bad wording; boot splash = boot splash for the init/cdev (what icon/state to show, etc.) not boot splash for the Macintosh ("Welcome to Macintosh") at large. I will clarify in the text.

I put together a page with most of the content (again, see previous disclaimer re. AI use): https://github.com/pappadf/granny-smith/wiki/Inside-the-Apple-Macintosh-Display-Card-24AC Agree, that would indeed be interesting - I will try to get it up and running.

I’ve got my emulated 24AC working now, so I can put together a write-up about all the internals of the hardware acceleration, if there’s interest. However, note that I’ve been using AI tools in this reverse-engineering work, so this is indeed “slop”

That guess aligns well with some observation I made related to the 24AC card (also by Radius). I recently tried to put together an "emulated" model of 24AC, and the dedicated silicon acceleration on it is honestly pretty limited - it's a pattern/fill + block-copy engine that the CPU has to feed...

Installing A/UX from floppy/cd:

For full disclosure, I should probably add Mistral to the list as well. Mistral is surprisingly efficient at OCR-like tasks, i.e., converting PDFs and scanned reference manuals to Markdown in bulk. That has basically been the workflow recently - convert full reference manuals to cleaned-up...

Yes, I've used Claude Code, Copilot, Gemini Code Assist, and Codex. This recently became my "playground" project for experimenting with them all. I debugged the MacTest application (hardware test suite) running on the Plus by hand- which took a very long time. I tried allowing Claude to use a...

Just added a new configuration dialogue - it's not perfect, but it makes it a bit easier to configure hdd images: https://pappadf.github.io/gs-pages/latest/ (still Chromium-based browsers only)

Thanks for the feedback! This is useful information! I haven’t tested with Firefox, but it’s obvious that I should. There isn’t a good UI for setting/configuring HD images, yet. In theory, you should be able to just drag and drop, but this hasn’t been well tested. The only alternative at the...

The world doesn't need yet another Macintosh emulator, but we all need a hobby, right? If anyone is interested, I've just released my small hobby project on GitHub - an embryo of a browser-first Macintosh emulator called "Granny Smith". You can try it out live here...