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Maybe this document explains it? https://www.zilog.com/docs/z180/appnotes/loctalk.pdf

printer cables are cross over but modem cables are not cross over. Well, a modem cable probably won't be mini-din at both ends so it doesn't matter.

I've never booted aix before. Dumps of the ROM's Open Firmware assembly and Forth/fcode is at https://tinkerdifferent.com/threads/apple-network-server-macos-based-roms-found.4756/post-41404 The load word from the aix-boot package (used when booting :aix) is supposed to set a aix-block0...

It could be bootable if there's a PCI option ROM to hold a driver. Some NVMe's do have a PCI Option ROM. Most do not. New World Macs can have their firmware modified by a firmware updater. Old World Macs can have a ROM SIMM replacement. An nvramrc script can load a driver from a disk that is...

What's MDS? MacASM is an assembler? Developing in a higher level language such as C or Pascal is probable preferable.

It might be possible to override the Mac OS X HeathrowATA driver with a patched version to enable LBA48. It would only work for Mac OS X though. Open Firmware needs a separate patch. I'm working on the Mac OS X and Open Firmware patches now. For Open Firmware, getting beyond the 8 GB CHS limit...

One would be nice for testing Thunderbolt, or USB 3.x, or NVMe or 2.5 Gigabit Ethernet in an old PowerPC Mac. Sure, I can use the StarTech PCI to PCIe adapter but that only gives up to 133 MB/s (I don't know if it can support 266 MB/s in a Yosemite or Yikes 66 MHz slot - and that slot is usually...

I've connected PCIe Nvidia 7800GT Mac Edition from my Quad G5 in a B&W G3 using a StarTech PCI to PCIe adapter. There's some notes about that and PCI/PCI-X to PCIe bridges at...

The Mac OS X boot loader - BootX needs Open Firmware. So just create a new BootX that doesn't use Open Firmware. Or, you can try creating a version of Apple's disk based Open Firmware that came with Copland D11E4 for the PDM Power Macs (6100, 7100, 8100). Maybe the boot loader that loads the...

Does this Apple flasher say anything about the ROM?

Aren't the SCC chips of the early Macs and Apple Lisa the same as the later Macs? Zilog Z8530. The functioning of the SCC is included inside later mac-io chips. The SCC chip has an option to switch the transmit and receive clock from the baud rate generator directly to the 3.6864 MHz of the...

It's a .sit file so I used Stuffit Destinations.app to unstuff it. Resource forks and FinderInfo are intact. Running on macOS Monterey. ~ % getfileinfo /Volumes/Storage/Downloads/AMUG\ Internet\ Assistant/AMUG\ Internet\ Assistant file: "/Volumes/Storage/Downloads/AMUG Internet Assistant/AMUG...

Have you looked at the ATI software and notes at https://gona.mactar.hu/ATI_Mac/ ? How is the ATI Rom Extender 1.2.5 related to the software in that list? Each ndrv (PowerPC Mac driver) is a PEF with a date. How do the dates in the PEFs of the ATI Rom Extender 1.2.5 compare?

That sit file has a "AMUG Internet Assistant" folder with the bundle (package) bit set? Or maybe there's a problem with the way I extracted it? getfileinfo /Volumes/Storage/Downloads/AMUG\ Internet\ Assistant directory: "/Volumes/Storage/Downloads/AMUG Internet Assistant" attributes...

That would require you to know how to use ResEdit, or to have the curiosity to search the ResEdit menus for commands that can do editing and copying and pasting...

Need a closer look at the rubber roller. Is it a rubber o-ring around a plastic cylinder that has a groove for the o-ring? If so, replace the o-ring. If not, 3D print a replacement rubber roller? Or 3D print a plastic cylinder with a groove for an o-ring? But before that, search for "rejuvenate...

/2 assumes unaligned happens 50% of the time. Try a different split. Probably < 50% is more likely? But I guess it depends on the guest architecture? for ((unaligned=0;unaligned<=100;unaligned+=10)); do printf "%3d%%: " "$unaligned" printf "%sc\n" "$(bc <<<...

I think the speed increase would come from the fact that optimized 68K code would read from aligned addresses? The emulator has to check for this alignment and use the slow path for unaligned accesses. Compare the instruction cycle counts in the CPU manual between aligned and unaligned accesses...

Use the Control Strip instead of the Monitors control panel to see the 1280x960 and 1280x1024 options. The Monitors control panel doesn't show those options because they are not marked as safe? The SwitchRes software may be able to fix that.

What modes do you see besides 1152x870?