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This has been the case since SCSI was introduced to the Macintosh line with the Mac Plus in 1986.
#Bootx old world linux mac os 9.2 driver
#Bootx old world linux mac os 9.2 code
The tl dr is that, after careful examination, I have determined that the SCSI code in the Pippin’s boot process is for the most part unchanged compared to a Mac of the same era. After all, from my initial search of the ROM it’s clear that Apple had patched part of the boot process to only allow starting up from the internal CD-ROM drive-who’s to say there aren’t further patches deep in the SCSI code? I took a break from examining the auth check code to dissect how the SCSI Manager behaves at startup on the Pippin, with the ultimate goal to discover if an exploit was even possible.
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In part 1 of this series of posts, Daniel suggested taking a look at the role the SCSI Manager plays in the Mac’s-and by extension, the Pippin’s-startup process. However, as far as I know, the SWIM II and later floppy controllers (including the SWIM III) lack the low-level access necessary for HD20 support, so large drives emulated by hardware such as the Floppy Emu will not work.Įxploring the Pippin ROM(s), part 4: Enter the SCSI Manager The drive itself is powered and controlled entirely by hardware already built in to the Pippin. There is an official floppy drive expansion dock and an unofficial floppy drive expansion board, both of which appear to be "dumb" hardware that merely connect a drive directly to pins of the Pippin's X-PCI connector on the underside of the system.
![bootx old world linux mac os 9.2 bootx old world linux mac os 9.2](https://www.pcwdld.com/wp-content/uploads/image9-17-e1621851738999.png)
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#Bootx old world linux mac os 9.2 serial
However, you won’t see anything on screen because it outputs to a serial console by default specifically, all console I/O is handled through the GeoPort. If you have the rare keyboard/tablet (or an ADB keyboard via the AppleJack dongle) attached and hold down Command-Option-O-F at startup, the Pippin boots to an Open Firmware prompt. Turns out, “most PowerPC-based Macintosh systems” happens to include the Pippin. According to the NetBSD/macppc FAQ, Open Firmware “is part of the boot ROMs in most PowerPC-based Macintosh systems, and we use it to load the kernel from disk or network.”