Recent content by PappaDF

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...