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I installed qnx4 under vmware workstation 5 on Windows2000 host.
After that I add to vwware virtual machine scsi drive with two qnx4
partitions as raw divice.
Running qnx4 and scan pci with utilites SHOW_PCI, it says:
Class = Mass Storage (SCSI)
Vendor ID = 104bh, BusLogic
Device ID = 1040h, BT946C SCSI controller
PCI index = 0h
IO @ 1060h MEM @ ec800000h
PCI Int Pin = INT A
Interrupt line = 9

thats because vmware create its own virtual SCSI adapter insteat of all
other real, furtunelly qnx4 understand this virtual adapter with driver
Fsys.aha4scsi!
http://www.qnx.com/developers/hardware_support/qnx4/qnx4hardware.html?catego
ry=FileSys#3

But when a run this driver like
Fsys.aha4scsi aha4scsi -a1060

Host machine send message!!!!!
-------------------------
Sorry, the guest operating system has requested an unimplemented operation
be performed by the virtual SCSI adapter; either install a more up-to-date
BusLogic/Mylex device driver in the guest or remove all virtual SCSI devices
from your virtual machine configuration.
-----------------------

What is the up-to-date BusLogic/Mylex device driver?
Why old-to-date BusLogic/Mylex device driver is not work?

I've got no clue. I just use IDE "drives" for my vmware sessions,
and haven't had a problem.

Can you please explain your use of physical disks using IDE
"drives" in vmware.

I'm trying to do the same but can't figure out how. I'm using vmware
workstation 6 and QNX 6.3. I'm trying to add a "Hard disk"
using the option "Use a physical drive" and it choses a
SCSI device without giving me the option of using IDE. My device is a
USB compact flash adapter, and it does exactly the same with a USB
thumbdrive. Are you using a PCMCIA adapter with a CF card for your
hard disk?