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Right. 0x1256 which is part of the 32 bit value at 0x1254. 0x1254 is Link1 and it is not 32 different bits - it is a 32 bit value which is a return address to code in ROM (specifically in the HWInit part of the ROM). There's no RAM or stack during this time in the boot process, so offsets...

What adapter did you get? It was probably not Dual Link. What Dual Link DVI supporting GPU are you using? I use this one with my Quad G5's Nvidia GeForce 7800 GT: https://gefen.com/product/dual-link-dvi-to-mini-dp-converter/ It can do 4K30, 1440p60, and 2560x1600 60Hz. etc. I suppose anything...

Right. That discussion is where the 0x78e842a8 checksum ROM came from. https://68kmla.org/bb/index.php?threads/the-820-0961-a-mystery-g3-3-3v-flashrom.48746/post-548625 And it mentions the 0x78eb4234 checksum ROM...

0x1258 is zero in both. I see 0x1254 = Link1 change from fff201f8 in FastConfigDump to fff20270 in SlowConfigDump. fff20000 (3MB + 128K, size 64K) is the address of HWInit in the ROM, according to the results created by the tbxi command. https://github.com/elliotnunn/tbxi fff201f8 is the...

0x1258 is Link2 which is probably going to be a Power PC ROM address (looks like 0xfff##### - last 1 MB of 4 MB ROM). It appears to only be used for calling SerialTestManager tests? Can you post one of your NVRAM dumps so I can compare? Is your ROM 077d.28f1 checksum 96cd923d or 077d.28f2...

I don't see where I said 0x1258 was being written to. Here's the list of events I see (DingusPPC pm7500, forcing 0x1043 to be = 9): - it reads nvram byte 0x1308 (speaker volume?) - inits all 26 ram banks. - scans all 26 ram banks. - writes to 0x1048..0x1117 (8 bytes for each hammerhead bank 0...

I didn't see anything get written to 0x1258. I wonder if 8500 is different than 7500 somewhere. I could retry using pm8500 in DingusPPC. Sure. Attached. I consider Discord like just another forum. Pick a username/password and you're done, just like any other forum. I guess so. Could run System...

DingusPPC Discord channel has the startup source code .Diagnostics.s that does the memory test. 0x1040 is called MemoryTestFlag. The "EMMO" pin of the BoardReg determines if .SerialTestManager should be executed.

Before System 7 has started. 0x1043 is definitely outside XPRAM in the grater NVRAM. The value is read after chime and reset to zero before the memory test so you never see the non-zero value during the OS. The memory test is called after calling .SerialTestManager. The Serial Test Manager...

There's mention of a rev 4 (version D) with checksum 0x78eb4234 but I only have 0x78e842a8 so I don't know if 0x78eb4234 is real.

I modified DingusPPC to log every nvram access. During startup of an emulated Power Mac 7500: - it reads nvram byte 0x1308 (speaker volume?) - inits all 26 ram banks. - scans all 26 ram banks. - it writes to 0x1048..0x1117 (8 bytes for each hammerhead bank 0 to 25 0x1048+8*26 = 0x1118). 4 bytes...

The zip files were created on Mac OS X so they preserve the resource forks (I'm currently using Monterey but other versions should also work). Decompress the zip files on Mac OS X before transferring the app to classic Mac OS. It has the built binary and the source code files (.z is a resource...

You can use my DumpNameRegistry app to capture all of NVRAM. XPRAM should be 256 bytes at offset 0x1300. PRAM is bytes inside XPRAM. https://68kmla.org/bb/index.php?threads/silicon-image-sil3112-flashing-easier-way-using-flashrom.7013/post-472471...

Another option: Turn the onboard chip into a PCI slot?

Can't you just remove the onboard ATI hardware from Open Firmware? Remove PCI device number 12 from the list of device numbers to be probed. https://68kmla.org/bb/index.php?threads/the-great-gazelle-pci-hack-thread-part-2.38360/post-467825

If the card can work in a B&W G3 then it might work in an older Mac. Nvidia cards 4MX, 4600, 6200, 6600, 7800, FX4500 have fcode that is conditionally compiled. Those require modification to work in Old World Macs. Conditionally compiled fcode is from Forth code that defines words inside an if...

Metrowerks CodeWarrior has different C standard library binaries for different compile options. "Build MSL Libraries.app" lets you choose which libraries to build. (4i means 4 byte ints). If you discover a bug in the source and make a fix, then you can recompile all the libraries. MSL C.68K...

The TALKs ROM seems to have differences between itself and the Mathey card that don't exist in the XRack card. Specifically, the ndrv, SIM, and kext have differences which are not related to the change in sub system-id The TALKs ndrv is from 2005 rather than 2006. The only difference may be...

The '*' modifier for the field width usually refers to the width of the text in characters, rather than the byte width of the parameter? hh is for char, but single byte quantities in 68K are always two bytes on the stack so it's not necessary? %l and %h - you mean these: o An optional...

I don't know about successfully flashing Nvidia PCI cards. There's some Original and Modified Mac ROMs for Nvidia cards at http://themacelite.wikidot.com/wikidownloads2 I would dump them with my DumpPCIRom.sh script to verify if the modifications are valid...