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B&W G3 can't boot USB or FireWire. You can invoke the text based boot picker using the multi-boot command. On later Macs, that command is graphical based, and multi-boot-menu is text based...

PCIe cards have only one notch which is near the back plate. They also have a tab nearer to the back plate to stop it from being inserted into a PCI slot. https://en.wikipedia.org/wiki/Peripheral_Component_Interconnect https://en.wikipedia.org/wiki/PCI_Express

Each file system partition of the disk should be a separate disk image for SheepShaver. Boot an external disk to make the disk images.

There might be a problem with different versions of Open Firmware. You would have to compare the ROMs to see what's different. The ROMs can be converted from fcode to Forth, modified, then tokenized back to fcode. The ROMs might have compressed parts which complicates the process. Maybe you can...

Go here: https://www.macdat.net/repair_portal.html and click Service Source.

That's the same Open Firmware version as the ANS 500 but should check the entire thing to be sure. To dump the ROM, you need a serial port connection from the modem port to a Mac or PC. Then you use Open Firmware on the ANS to dump the hex of the ROM. Go to the first post of this thread and...

ROM version, checksum? MD5? We have info for the ANS 500 but not the others.

Found this: which points to: https://www.reenigne.org/misc/ntsc.zip which exists on GitHub at: https://github.com/reenigne/reenigne/tree/master/ntsc It has two command line executables avi2ntsc.exe and ntsc2avi.exe. ntsc2avi.exe converts 8 bit PCM 14.318MHz sampled composite video to AVI...

A normal inductor won't work? https://en.wikipedia.org/wiki/Inductor The schematics say L2 (connected to -12V) is 27µH L1 (connected to +12V) and L3 (connected to +5V) are 28 µH (toroid) These three are connected to the Power connector J7 Actually, I think that's the schematic for the main...

Why do I want AFP? Why don't I have AFP already? When did I stop having AFP? I have Intel Macs (Mac OS X10.4 to 15.0) and PCs (Linux/Windows). I have PowerPC Macs that can run System 7 to OS X 10.5. They can connect to Intel Macs that are running early versions of Mac OS X (either booted or in a...

The way I think an arbiter works is, it checks for REQ from a device and gives it GNT to allow the device to do work. When the device releases REQ, the arbiter releases GNT and checks the next device. I suppose the PCI Local Bus Specification will explain it - at least the PCI part. There's...

Is there a download link for the ROM? I don't think the archive sites have that one. It might be nice to try and emulate it in DingusPPC. I'm looking for any Mac ROM that's not in the list at...

It does simplify things. What ROM does it use? Does it have Open Firmware? The S900 uses the same ROM as the Power Mac 7200&7500&8500&9500 v2 which doesn't have issues with PCI-PCI bridges. There's an S900 discussion at...

You didn't connect an interrupt for E1 so the mouse freezes if you move the cursor onto the GPU that is in that slot. The default interrupt for E1 is the COMM_SLOT_INT. Slot E1 is IDSEL AD17. The interrupt bit is 0x16. I expect you could connect any number of cards and read config data or setup...

I said the interrupts were probably ok for A,B,C because there's an interrupt pin on OHare for each of them. Its the GNT and REQ for C that I'm wondering about. Did you find out if A19 and B10 are connected to anything?

I think interrupts should be working, so you can move the mouse around the display connected to slot C. Does the Matrox card enable bus master? Does it have 2D or 3D acceleration? Try a ATA or USB or FireWire or SCSI card? Some of those probably won't work.

Equivalent in this case means that CSII has the same number of interrupt connections to OHare as Slot_B, just like every other PCI device connected to OHare. Equivalent doesn't mean that CSII and Slot_B uses the same interrupt. All PCI devices connected to OHare have a separate interrupt input...

Is the riser that is the same for Alchemy and Gazelle a two slot riser or a three slot riser? That C600 UMAX Riser is not the same as the Apple Alchemy and Gazelle riser as it has a non-PCI connection with many more pins to accomodate the third slot and a comm slot. I suppose any riser with...

U23 is the chip on Alchemy. You want U20 on Gazelle. Or am I confused about what machine the goal of these threads are for? We don't have Alchemy schematics. U20 is used for doing GNT for 4 of the 5 PCI slots/devices from OHare (page 7-B7). U20 is a 74F32 which only has 4 OR gates so it can only...

I believe bus masters use REQ and GNT (check the PCI local bus specification). What REQ and GNT lines are you planning to use from OHare for Slot_C? Heathrow for Gossamer appears to have 6 pairs of REQ/GNT lines. A bus master is one that can read and write to the Mac's RAM using DMA or read and...