Mac OS X Server 1.2 (Pele1Q10) not loading second stage installer

[calmsacibis995]

Describe the bug
When attempting to install Mac OS X Server 1.2 (Pele1Q10), the installer from the Mac OS 9 side fails, with an error that it cannot configure the system to boot from the CD-ROM.

To Reproduce
Steps to reproduce the behavior:

1. Start the emulator and boot from the Mac OS X Server 1.2 (Pele1Q10) installation CD.
2. Start the installer from the Mac OS 9 side.
3. Go through all of the prompts, until the final one, which is supposed to configure the machine for booting into Mac OS X Server proper.
4. See the error as stated in the short description.

Expected behavior
No errors being reported, system restarts and boots Mac OS X Server.

Screenshots
If applicable, add screenshots to help explain your problem.
Device Information (please complete the following information):

• Device Type: Desktop
• Host OS: Fedora 43 Workstation (Linux 6.19.14)
• Host Processor: AMD Ryzen 7 5700X
• Host RAM: 16 GB
• Guest OS: Mac OS X Server 1.2 (Pele1Q10)
• Guest Processor: PowerPC G3
• Guest ROM: Gossamer (Power Mac G3 Beige)
• Guest RAM: 128 MB
• Build Date 06/05/2025
• Version: Latest from Git

Additional context
I noticed some ATAPI CDROM errors when loading the Mac OS 9 side:
( 167.779s) atapibasedevice.cpp:200 ERR| ATAPI-CDROM: unsupported command 0xEC
( 183.231s) atapicdrom.cpp:332 ERR| ATAPI-CDROM: unsupported ATAPI command 0xA4

These are errors that showed up during the drive selection:
( 973.785s) atahd.cpp:240 ERR| ATA-HD: unknown ATA command 0xe5
( 973.841s) atahd.cpp:240 ERR| ATA-HD: unknown ATA command 0xe5

These are errors that occurred when attempting to configure the machine to boot the Mac OS X Server side:
( 976.568s) atahd.cpp:240 ERR| ATA-HD: unknown ATA command 0xe5
( 976.599s) viacuda.cpp:801 WARN| Cuda: unsupported pseudo command 0x24 TIMER_TICKLE - Byte Sent: 0xa0
( 976.680s) atahd.cpp:240 ERR| ATA-HD: unknown ATA command 0xe5
( 976.800s) atabasedevice.cpp:46 INFO| ATAPI-CDROM: soft-reset triggered
( 976.837s) atapicdrom.cpp:332 ERR| ATAPI-CDROM: unsupported ATAPI command 0xAD
( 976.837s) atapicdrom.cpp:332 ERR| ATAPI-CDROM: unsupported ATAPI command 0x4A

After clicking the Sorry button when the error window appears:
(1131.186s) atahd.cpp:240 ERR| ATA-HD: unknown ATA command 0xe5

[calmsacibis995]

From what I can tell, the whole problem is SCSI-related, as several ATA/ATAPI commands are not implemented. I'm trying to implement at least one of them (0xE5 - CHECK POWER MODE)

[joevt]

An OS might try to use a command, and then perform a different command if it doesn't work, so it's not always necessary to implement every command that is logged by DingusPPC. I guess you have to have the source code for the OS (this is a version of Rhapsody?) to know for sure if the command needs to be implemented. Or just implement the command to see if it helps get you further in the process.

[calmsacibis995]

Yes, this is a version of Rhapsody, specifically 5.5, otherwise known as Darwin 0.3.

Update: I created PR #179 to implement 0xE5.