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You're right with that 8.4GB barrier on Beiges. I did some research on this issue. Here my results: both Beige ROM revisions I have dumps for contain ATALOAD driver. This is actually the same old code as found in some Power Macintoshes and Power Books with default IDE support like PM 5200 or PB...

Does anyone know how to disassemble Apple 678-0136 (Panasonic CR-585-B) ATAPI CD-ROM drive? Its controller board probably needs recapping. But I'd also like to take a closer look at the ICs and eventually dump the firmware. I suspect that the PCB is held by the tray motor - see those fat...

Many thanks! The dump you've attached indeed contains the declaration ROM required for emulation. FYI, I created a branch in my DingusPPC repository dedicated to PC card emulation: pc-compat The last commit there contains initial code for loading the declaration ROM and initializing the on-card...

Disk Copy images can't store low level details of a floppy disk so they can't be used for preserving copy protected games. That's why a2r, WOZ and a couple of other formats exist. Copy protection software usually violate the low level floppy formats on purpose in order to make protected disks...

Interesting thread! BTW, can someone provide me with the dump of the declaration ROM of a Houdini II card? My DingusPPC emulator is about to emulate a Power Macintosh 6100. I'd like to attempt at Houdini emulation someday. Such a thing wouldn't have any other value than preserving the original...

@Phipli Indeed, awesome! Thank you for the clarification! I wonder which device actually uses the PCI slot in the PERCH connector?

Is that J5 on the left side of the above photo?

I wonder if that big 112-pin connector on the personality cards actually carries PCI signals. The AIO service manual says it does not. If that's true I'm asking myself why it has so many pins? The only way to figure it out is to take a closer look at a child card intended to be plugged in there...

I don't mean to sound arrogant but I still can't believe that those units aren't serviceable. It might be not easy or cheap but they are still standard switching PSUs so it should be possible to repair them. We may need to make a good repair guide first. There are really advanced tech guys...

Not especially a 8600 PSU, but I successfully recapped the Astec PSU from my Power Macintosh 6100. I got a good guidance at the Badcaps forum: https://www.badcaps.net/forum/showthread.php?t=62455 The most interesting topics discussed there are the choice of the replacement caps as well as...

All Beige G3 ROMs I've seen so far contain Open Firmware drivers as well as native drivers for soldered on-board ATI GPUs. Otherwise, those chips would not be recognized at all.

@trag Thank you for reposting the link to your ROM pinouts.👍 AFAIK, pin 122 of the Beige ROM DIMM tells whether 64bit burst access ROM is installed. "0" (low) means burst ROM is present...

CPU daugthercard slot sounds like a non-standard, machine-specific connector. AFAIK, Apple Catalyst boards don't offer something like that. While the Hammerhead memory controller provides some multiprocessing support there is nothing comparable in Platinum. Moreover, Catalyst-based boards come...

Which slot is your CPU card is meant to be put into? IIRC, a Catalyst logic board doesn't have any PDS or similar. It has a ROM SIMM slot instead, see the annotated logic board photo here. I can only speak for original Apple boards...

Can you boot it into Open Firmware and dump the device tree node for Heathrow?

Do we need new ROM SIMMs for that or is it possible to reflash old ones? BTW, I remember seeing a Wiki page with pinouts for various PowerMac ROM SIMMs. It looks like the page has disappeared. I can't find it anymore. IIRC, it was created by @trag but I'm not sure...

I only have two ROM dumps: 0x40F2 and 0x45F2. I never saw 0x45F1...

@Phipli Thank you for the device tree dump for your board. Judging by the revision-id property, it's still the same host IDE hardware.

IDE support in Beige G3 is provided by the Heathrow ASIC. The Desktop variant, ROM Release 0x40F2, uses REV 1 of the Heathrow ASIC. That's what the device tree node in OpenFirmware 2.0f1 displays for Heathrow: Please notice the value of the `revision-id` property that contains "1". Now...

Linux PPC includes a driver for Twin Turbo cards. Here its source code. Unfortunately, code quality is poor: for the most part it stuffs magic values into magic registers. Moreover, it looks like the driver only implements a dumb frame buffer. 2D/3D acceleration isn't even mentioned there. In...