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That works on my Quad G5 (running with 3 CPU cores) with 7800 GT Mac Edition (currently using my 64K compressed ROM). Currently using a display set to 2560x1440. - 9331 in Leopard 10.5.8 - 12700 in Leopard 10.5.8 after putting the display to sleep for a second by moving the mouse to a hot...

The ANS code has one fcode image for the GD5430. I would have just used that to create an fcode image for a PCI Option ROM but some additions/changes would be needed to handle words that are in the ANS ROM but not part of the Open Firmware spec. Your ROM is currently set to compile for GD5446...

The post at https://68kmla.org/bb/threads/refurbished-powermac-6500-acting-up-did-i-do-it.50456/post-570219 says if it finds an IDE drive, it will try to boot from it but if the OS is not a supported version then it will not try SCSI drives. I don't know if it would look for a SCSI drive on a...

Makes sense. UE8 has an 8 bit bus. Bit 4 is VID(4) which is pin 10 on UE8 and pin 2 on UC6.

If that's a black and white 1 bit graphics mode, then there's a problem with an 8-bit bus so ignore any buses or chips that are 16 or 32 bits. It looks like a problem with the 4th pixel from the left. That is bit 4 (bit 0 is the 8th pixel) for 8-bit buses. Bit 12 and 4 for 16-bit buses. Bit 28...

Which systems are you referring to? What ROM checksum?

https://68kmla.org/bb/threads/read-write-pram-and-xpram.47196/post-578967

A user of a rev C ROM Beige G3 reports that applying the cache line size and master latency timer fix that exists in the rev D ROM for PCI bridges improves performance. You can test this on a Beige G3 or any Power Mac. First, find the config address of the PCI bridge that contains the...

At https://forums.macrumors.com/threads/nt-on-powerpc-macs.2431186/post-33669034 , @Rairii said the NT drivers are for UHCI (USB 1.1) but Macs usually use OHCI ( USB 1.1) or EHCI (USB 2.0) I wonder if you could insert a UHCI PCI card for NT?

The code for my DumpNameRegistry app can be modified to read/write XPRAM for PowerPC Macs in classic Mac OS. On New World Macs, PRAM/XPRAM is stored in a NVRAM partition named "APL,MacOS75" so you need code to find the partition. There's probably an API specifically for modifying XPRAM so you...

Some XPRAM notes at https://68kmla.org/bb/threads/skipping-the-startup-memory-test.50699/post-570896

bitsavers website has PowerSurge Flash ROM pictures and schematics. http://bitsavers.org/pdf/apple/powerpc/PowerSurge/ROM_Flasher/

Maybe you need something from here? https://gona.mactar.hu/ATI_Mac/ Search for 9200 and follow the recommendations.

On New World Macs, NVRAM is stored on the same flash chip as the ROM. The ROM is a flash chip and therefore can be modified. On Old World and New World Macs, NVRAM is 8KiB and there's a section reserved for PRAM settings and a section reserved for NVRAM settings and a section reserved for non...

Here's the Open Firmware Extender I've been working on (only for Open Firmware 2.4) 1) Search product/install_of_extender2.4.txt for load ide/disk and change the partition number (currently 15) to the partition number (in decimal) of a HFS Standard partition on the master IDE drive of the first...

Remind me, what Mac, OS, GPU, miniDP-to-HDMI adapter, cables, and display are you using? Power Macs don't have DisplayPort so a miniDP to HDMI conversion isn't useful.

I wonder if that PCI bracket was cut and stamped or if it was cut, stamped, and then cut again for the smaller radius.

You could design a 3D printed mini DIN holder. Print it out of plastic or metal. Make it as thick as you like so it can't break or sandwich the mini DIN holder between the PCI bracket and a metal plate (if you don't want to expend the effort to make a mating radius in the metal plate). PCI slot...

The PCI slot cover needs 3 or 4 holes. One big hole for the miniDIN. One small hole (beveled) for the existing screw. Two holes for the stiff bit of sheet metal (two holes so it doesn't rotate). Attach with machine screws (and nuts if the PCI plates are not threaded). Instead of wedging, use a...

Get the ROM checksums from Open Firmware to see if it's an exact match to the Apple ROM? https://tinkerdifferent.com/threads/apple-network-server-macos-based-roms-found.4756/post-41390