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The Power Mac 6100 is also not Open Firmware but the Copland disk based Open Firmware loads on that. I don't know if it loads on non-PDM Power Macs. 5200 is Cordyceps, not PDM. Since the Copland Open Firmware is disk based, I suppose it could be modified to work on other Macs but that might be a...

Would accessing the CPU via Open Firmware offer alternate means of gathering or testing such info? Copland has a disk based version of Open Firmware for NuBus Macs. https://tinkerdifferent.com/threads/powermac-7100-and-linux-and-netbsd.4368/ /openprom@0 PROPERTIES: name...

"Old World Support" is from "OS 9 Helper" unless there were multiple projects that use the same picture...

Did you have a second display connected so that you can see the Displays preferences panel for the display that was black? Or use screen sharing? Then see what display options are available? Or use SwitchResX to view more options? Connect the monitor via HDMI adapter to modern Mac and extract...

Question about MIDI: Does the serial clock have anything to do with the timing of audio and such? I think the time it takes to send a note command is much shorter than the time it takes to play the note. Therefore, the serial output is usually idle? And the timing is done by the host using its...

Since every 8 pixels is broken, you're looking for an 8 bit data bus probably. Looks like Data Bit 0 is broken. The right side of each byte is stuck black. The left side of each byte is Data Bit 7. I compared your image to an image taken from infinitemac.org with bad disk - assuming your Mac...

Cool. One day I want to work on an XHCI or NVMe driver for PPC Mac OS X. Has anyone tried XHCI or NVMe on a Quad G5 with Linux?

Well, anything > 500 MB/s is definitely at least in the PCIe gen 1 x4 range. It would be nice to know if it's possible to get into the PCIe gen 1 x8 rage (>1000 MB/s). 515 MB/s is without RAID. 645 MB/s is with RAID. That's 322 MB/s per disk. That's 60% of the single disk performance. The drop...

The Quad G5 Developer Note says the HyperTransport bus to the Mid Bridge that hosts the x4 and x8 slots is only 1600 Mb/s https://leopard-adc.pepas.com/documentation/Hardware/Conceptual/PowerMac_G5_05Oct/Articles/PwrMacG5-0510_archi.html#//apple_ref/doc/uid/TP40003917 1600 Mb/s is only 200 MB/s...

I didn't realize I volunteered. I am thinking the code path for PDM Macs (6100, etc.) probably involves the stuff I mentioned at: https://68kmla.org/bb/index.php?threads/skipping-the-startup-memory-test.50699/post-571099 I checked the Memory control panel in DingusPPC. All the options are...

The Power Macintosh 6100 emulation at infinitymac.org (uses DingusPPC) doesn't seem to have a memory test option in the Memory control panel of Mac OS 8.0 but does have the option in Mac OS 8.6. I would add some NVRAM logging to DingusPPC to see if it's accessing XPRAM or something.

In Mac OS 9, you can bless the System Folder by moving the System or Finder out and into the System Folder. A blessed System Folder will have a Happy Mac icon. My dumpvols.sh script will show which folders are blessed on each volume. It uses the bless command. It also parses the FinderInfo in...

Check devalias to see if there's an alias that you can replace /pci@f2000000/mac-io@17/ata-4@1f000 with. You usually don't need both the name (before @) and the unit address (after @) unless there's multiple nodes with the same name. So these should also work: /pci/mac-io/ata-4 /pci/@17/ata-4...

7100 and other PDM machines don't have the same NVRAM as CHRP machines. The test of the CHRPNess bit fails, so it won't do the NVRAM write for GrandCentral, OHare, or Heathrow which don't exist in the PDM machine...

UniversalTables.a shows how the bits are setup for different machines. Just need an algorithm to find this in the ROM. Edited my previous post above.

43 0x0ac GrandCentralAddr GrandCentralExists, 44 0x0b0 Unused44Addr PBX1Exists, 45 0x0b4 Unused45Addr PBX2Exists, 46 0x0b8 Unused46Addr PBX3Exists, 47 0x0bc Unused47Addr ATAExists, 48 0x0c0 Unused48Addr HammerHeadExists, 49 0x0c4 Unused49Addr PlatinumExists, 50 0x0c8 Unused50Addr...

If you grep for (\$|0x)0*2400\b you find it in Boot3.a, UniversalEqu.h, InternalOnlyEqu.a, InternalOnlyEqu.r, StartInit.a, ShutDownMgr.a elliotnunn/boot3 elliotnunn/CubeE elliotnunn/mac-rom elliotnunn/supermario 0xDD0 is AddrMapFlags - a set of 32 boolean flags (one per bit). 0x2400 is...

These appear to be from the gpch resources. A couple bits of misc are documented in Inside Macintosh. What bit does it check? kdia is undocumented. $ddc is BootGlobPtr which I think points to a StartGlobals record. $dd8 is UnivInfoPtr which is type ProductInfo. $68 is beyond the offsets...

Not a significant difference. That's how you know it's not a passive HDMI to DVI adapter like the one you bought. Atlona AT-DP400 is an alternative. Don't know if it's for sale anywhere. ebay? It's DisplayPort. Shouldn't matter. I don't have Apple DisplayPort displays. It works with all my...

Well, the connector is Dual Link. But probably none of the Dual Link pins are connected to anything. Also, there doesn't look like there's enough room or power for the chips required to convert Dual Link to Single Link. I don't think I've ever seen a Dual Link to Single Link adapter that...