Recent content by joevt

Can you get a ROM dump of the card? I want to compare it with the 6800 ROM dump that I have. I also created an Old World Mac compatible version of that ROM and some other Nvidia ROMs (6200, 6600, 7800) that only worked in New World Macs. PCIe cards require a PCI to PCIe adapter for most Macs...

Asynchronous in this case just means that the sender and receiver don't share a clock? They must use the x16 or x32 or x64 clock mode to recover the clock from the receiver. They don't have a start bit or stop bits? They use a SYNC character? I'm adding logging to DingusPPC to show how the SCC...

The Hammerhead memory controller in those machines actually supports an extra 128 MiB on top of that 1.5 GiB (1.625 GiB total 0x68000000). You can try this in the DingusPPC emulator. The problem with > 1.5 GiB 0x6000000 is that the 68K emulator used for classic Mac OS versions is hard coded to...

External clock is probably the easiest and best choice: https://68kmla.org/bb/threads/localtalk-but-faster.45615/post-505309 The PCLK could be used, but there's a couple issues with that: - Different Macs have different PCLKs. Maybe only Power Macs had PCLKs in the >10MHz range. - The PCLK has...

Maybe this document explains it? https://www.zilog.com/docs/z180/appnotes/loctalk.pdf

printer cables are cross over but modem cables are not cross over. Well, a modem cable probably won't be mini-din at both ends so it doesn't matter.

I've never booted aix before. Dumps of the ROM's Open Firmware assembly and Forth/fcode is at https://tinkerdifferent.com/threads/apple-network-server-macos-based-roms-found.4756/post-41404 The load word from the aix-boot package (used when booting :aix) is supposed to set a aix-block0...

It could be bootable if there's a PCI option ROM to hold a driver. Some NVMe's do have a PCI Option ROM. Most do not. New World Macs can have their firmware modified by a firmware updater. Old World Macs can have a ROM SIMM replacement. An nvramrc script can load a driver from a disk that is...

What's MDS? MacASM is an assembler? Developing in a higher level language such as C or Pascal is probable preferable.

It might be possible to override the Mac OS X HeathrowATA driver with a patched version to enable LBA48. It would only work for Mac OS X though. Open Firmware needs a separate patch. I'm working on the Mac OS X and Open Firmware patches now. For Open Firmware, getting beyond the 8 GB CHS limit...

One would be nice for testing Thunderbolt, or USB 3.x, or NVMe or 2.5 Gigabit Ethernet in an old PowerPC Mac. Sure, I can use the StarTech PCI to PCIe adapter but that only gives up to 133 MB/s (I don't know if it can support 266 MB/s in a Yosemite or Yikes 66 MHz slot - and that slot is usually...

I've connected PCIe Nvidia 7800GT Mac Edition from my Quad G5 in a B&W G3 using a StarTech PCI to PCIe adapter. There's some notes about that and PCI/PCI-X to PCIe bridges at...

The Mac OS X boot loader - BootX needs Open Firmware. So just create a new BootX that doesn't use Open Firmware. Or, you can try creating a version of Apple's disk based Open Firmware that came with Copland D11E4 for the PDM Power Macs (6100, 7100, 8100). Maybe the boot loader that loads the...

Does this Apple flasher say anything about the ROM?

Aren't the SCC chips of the early Macs and Apple Lisa the same as the later Macs? Zilog Z8530. The functioning of the SCC is included inside later mac-io chips. The SCC chip has an option to switch the transmit and receive clock from the baud rate generator directly to the 3.6864 MHz of the...