Recent content by joevt

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?

What version of Mac OS?

Try the 17" mode. If that doesn't work, try the VGA mode.

Is the emulated LC475's ROM choosing the Product Info from the Universal Tables that a real LC475 would?

For PDM and TNT machines (I didn't check the others), I think only 16 AMD Am28F020 chips is supported by the classic Mac OS flasher app. The flasher app has code for 16 Intel 28F020 chips but I don't think it can work because the code checks for the wrong device ID on the side that is reversed...

I think the flash programmer software expects the ROM to have 16 chips. See the disassemblies in the TinkerDifferent thread.