[65a]

StarMax series (and the 4400) seemed to be about as close to CHRP as we got. My off-brand StarMax clone (PowerCity) had a PS/2 and an ISA port. Ran BeOS well, and had a quirk that I could hear a tight loop on the speaker.

[fredoralive]

AFAIK most StarMax systems that were released (a prototype exists of a CHRP StarMax model) are based on the Tanzania / LPX-40 design, which is mostly a traditional PCI PowerMac[1], albeit with oddities like support for PC style floppy drives. PS/2 is handled by the CudaLite microcontroller which presents it to the OS as ADB devices for example. I've not heard of a version with ISA slots, although I assume you could just have a PCI to ISA bridge chip, even if MacOS presumably wouldn't do anything with it.

[1] https://cdn.preterhuman.net/texts/computing/apple_hardware_d...

[65a]

Right, I think those were the closest we got to the CHRP standard, as they moved the platform toward PC-style floppies, PS/2, ATX PSU and even more generic "platform" stuff than most clones. I'm fairly sure I had an ISA slot, I do remember trying to get a bargain bin NE2K card working in mine under linux (it didn't work). Definitely did nothing under OS 8/9.

The powercity models were interesting, because they came out after Apple revoked Motorola's clone license. A German company, ComJet, bought up the boards and sold unlicensed clones cheap. Case was slightly different, but otherwise they corresponded to StarMax models (fairly certain they were identical but may have been last revision boards).

[winocm]

Kinda sorts. The systems that the "MacOS on CHRP" thing ran on had a very strange looking device tree, with some bizarre combination of PC and Mac peripherals.

  Apple Cobra Open Firmware CHRP 1.1 B3 built on 08/18/97 at 13:04:24
  Copyright Apple Computer 1994,1996,1997
  Copyright IBM Corporation 1996
  All rights reserved.
   ok
  0 > dev / ls 
  ff82ec18: /cpus
  ff82ee08:   /PowerPC,604e@0
  ff82f600: /chosen
  ff82f750: /memory@0
  ff82f8d8: /memory-controller@fec00000
  ff82f9d8: /openprom
  ff82fab8: /rom@ff000000
  ff82ff48:   /boot-rom@fff00000
  ff830060: /options
  ff830828: /aliases
  ff830c78: /packages
  ff830d00:   /deblocker
  ff8314c8:   /disk-label
  ff832090:   /obp-tftp
  ff835db8:   /mac-parts
  ff836578:   /mac-files
  ff837de0:   /fat-files
  ff839700:   /iso-9660-files
  ff83a148:   /bootinfo-loader
  ff83b7d0:   /xcoff-loader
  ff83c060:   /pe-loader
  ff83c7d0:   /elf-loader
  ff83da18:   /terminal-emulator
  ff83dab0: /rtas
  ff83dc70: /pci@80000000
  ff83ff38:   /isa@b
  ff8414e0:     /nvram@i74
  ff841ad0:     /rtc@i70
  ff842500:     /parallel@i378
  ff842988:     /serial@i3f8
  ff843020:     /serial@i2f8
  ff8436b8:     /sound@i534
  ff850288:     /8042@i60
  ff8515f8:       /keyboard@0
  ff854b88:       /mouse@1
  ff8554c0:     /fdc@i3f0
  ff858730:       /disk@1
  ff85bac0:     /op-panel@i808
  ff85bba0:     /pwr-mgmt@i82a
  ff85bed8:     /timer@i40
  ff85c070:     /interrupt-controller@i20
  ff85c250:     /dma-controller@i0
  ff85c738:   /pci-ide@b,1
  ff85d028:     /ide@0
  ff85db78:     /ide@1
  ff85e6c8:       /cdrom@0
  ff862e60:   /mac-io@d
  ff863468:     /scsi@10000
  ff865298:       /disk
  ff8660c8:       /tape
  ff8671b8:     /adb@11000
  ff867cb0:       /keyboard@2
  ff8685a0:       /mouse@3
  ff8687c0:     /escc-legacy@12000
  ff8689b8:       /ch-a@12002
  ff868b08:       /ch-b@12000
  ff868c58:     /escc@13000
  ff868e40:       /ch-a@13020
  ff869500:       /ch-b@13000
  ff869bc0:     /via@16000
  ff869cb0:     /interrupt-controller@40000
  ff869e70:   /cirrus@e
  ff86e2c8:   /pci1022,2000@f
   ok
  0 >

Refer to the "Macintosh Technology in the Common Hardware Reference Platform" book for more information, if you're curious about the Mac IO pieces.

The Motorola Yellowknife board seems remarkably similar to this system, as well as the IBM Long Trail system (albeit with Long Trail using a VLSI Golden Gate versus a MPC106 memory controller). Both of them use W83C553 southbridges and PC87307 Super I/O controllers.

The architecture is kind of weird, but the schematics on NXP's website can probably elucidate a bit more on the system's design.