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There shouldn't be a difference. The point of the test is to prove it. If there was a problem, then it could indicate too much noice on the PCI bus, etc.

FireWire is nice because it's 40 MB/s, faster than USB 1.1 and SCSI 2. USB 2.0 doesn't work in classic Mac OS. A FireWire enclosure can be connected to modern macOS but for Tahoe, you need to use USB instead of FireWire. FireWire enclosures may include USB 3.0 but I think they are no longer...

Copy the Mac OS 8.1 installer to a small hard disk partition?

Don't you just need to change the signature in the HFS Plus Volume Header from 0x4858 to 0x482b? Google says no. The format changes the way names are indexed and managed. It says "The safest way to do this is to back up your data, erase the drive with the new format, and then restore your...

Not sure what this means. Since slot F1 has device number @12 (hex), I would expect that address line 18 (decimal) is used for the IDSEL signal for that PCI device. That's what the Power Mac 6500 schematics show (sheet 16 for the ATI-264GT device, area A6 in that diagram). Slot C1 has device...

It depends. Alchemy has a couple options (slot, interrupt, device number): AAPL,e407 (Power Mac 5400) slot A1 0x17 @D slot B1 0x19 @E slot C1 0x1C @F slot E1 0x16 @11 // Ethernet? // same interrupt as bandit // seen in 5400 dump AAPL,Hooper slot B1 0x1C @E slot C1 0x1A...

Power Mac 6360 doesn't have built-in ATI graphics so it might not have the same issue as Power Mac 6500/TAM (Gazelle). The solution was a workaround. I would like to actually find the real bug one day. https://68kmla.org/bb/threads/the-great-gazelle-pci-hack-thread-part-2.38360/post-467825...

Use an oscilloscope to check the timing? Composite sync signal is correct? https://www.brutaldeluxe.fr/documentation/cortland/v6/Apple%20-%20IIgs%20RGB%20monitor%20-%20Timing%20chart.pdf https://dn790000.ca.archive.org/0/items/Apple_Color_RGB_Monitor/Apple_Color_RGB_Monitor.pdf...

I can't get the emulation to boot. Do I need any special setup for ANS ROM 1.1.20.1 besides attaching the HD to external SCSI? Maybe a dump-device-tree from a real ANS 1.1.20.1 would help. What's the output of these commands before booting Mac OS 9.1? F301A000 @ 8 u.r F301E000 @ 8 u.r...

Ok the reason for the doubled character printing of those LCD messages is that it is outputting the message to both the LCD and the Serial port. DingusPPC displays them together in stdout. DingusPPC doesn't have a separate output for the LCD but you can specify a separate output for the serial port.

To be clear, all the other messages appear normally. It's just these messages that the ANS ROM is doing strangely (outputting the same character more than once). Do these messages appear at all? Begin DRAM Test #1 Begin ROM SIMM TEST Begin NVRAM Test Begin DRAM Test #2...

Are you using different ROMs in the same ANS? Which ROMs are you trying? You should probably zap PRAM when changing the ROM. ANS 2.0 identifies itself as AAPL,9500. Maybe you used this which causes the PowerSurge nvramrc script to be used? All other ANS ROMs identify themselves as...

I guess DingusPPC mentions the Am79C940 datasheet because a Datasheet for the AM79C950 doesn't exist. Actually, a Datasheet does exist at http://bitsavers.org/components/amd/_dataSheets/1991_79C950_CURIO.pdf

Right. We'll need an nvramrc script that loads code from a partition like my Open Firmware Extender for Open Firmware 2.4 (Beige G3). I don't think Open Firmware earlier than 2.4 allows loading from an HFS partition, so the code will need to be in a special partition. Open Firmware Extender is...

Video ndrv is from the ndrv_506_53m30.pef file produced by tbxi dump. Are you going to try the same for ndrv_-20424_SimNCR53c8xx.pef to support internal SCSI? Create a OFpt resource with Open Firmware patches for 1.1.20.1. The first unused resource ID is 137. Create a new entry in the OFtc...

I think only 2.26B6 has first 3 MiB of 9500 v2 as indicated by the 32-bit checksum which covers only the first 3 MiB of the ROM. The ROMs include a 64-bit checksum that covers the entire 4 MiB. 1.0.5 077d.28f1.1 96cd923d c241cd82bf90797a dfebb8fdad4124e02608429d98bf349b PM 7200 & 7500...

560x384 is meant for Apple II graphics which has non-square pixels. Apple II graphics is 192 lines (half of 384). Double Hi-Res or 80 column mode is 560 wide (4 per NTSC color burst period). Hi-Res or 40 column mode is 280 (2 per NTSC color burst period). The 12 inch RGB display is a fixed...

Right. To boot 1.1.20.1 from internal SCSI, you would need Open Firmware to load the Mac OS driver from disk or add the driver to a PCI card with a flash ROM - any card should work as long as the flash ROM is large enough. You can make a ROM that has nothing to do with the PCI controller you...

Can you do a l2cr@ on the 1.1.20.1 ROM and do l2cr! on the 2.0 ROM? It looks like 1.x doesn't have l2cr@ or l2cr! words so you would have to define them. Only the 2.0 ROM looks at L2CR. The other 4 ROMs do not. So it's kind of strange that 2.0 has worse performance. Maybe it's changed by system...

The Mac OS X SDKs have StubLibraries including CarbonLibStub. That should be sufficient for linking? MacOSX10.1.5.sdk MacOSX10.2.8.sdk MacOSX10.3.0.sdk MacOSX10.3.9.sdk MacOSX10.4u.sdk Metrowerks CodeWarrior Pro 6,7,8,10 have a StubLibraries folder. These are part of Universal Interfaces -...