Is it possible to boot a guest from usb?

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abk4523
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Is it possible to boot a guest from usb?

Post by abk4523 » Thu 20 Jun, 2019 8:59 pm

This is probably just my misunderstanding of the hardware. I have an atapi drive from an old laptop and am trying to use it with PCem. I use an atapi ide to usb adaptor to connect it to my laptop. I tried a pentium overdrive mmx 200 bios and looked for a boot from usb option but could not find one. So I set the bios to look for the boot files on the cd rom drive and booted. I got a "boot from atapi cdrom" message and the machine seems to hang. I know some bioses, as early as 486dx2s, can boot from usb. Does PCem support this feature, am I using the wrong equipment, or am I dreaming something like this can work? I could test with another bios but if PCem does not support this, why bother.

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ppgrainbow
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Re: Is it possible to boot a guest from usb?

Post by ppgrainbow » Thu 20 Jun, 2019 9:09 pm

PCem has no support for USB devices at this time. You can only boot from ATAPI or SCSI CD-ROM or Iomega ZIP drives.

If you want to boot a guest OS from USB, you can place the hard disk image, CD-ROM ISO or Iomega ZIP onto a USB device and boot it from there.

abk4523
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Re: Is it possible to boot a guest from usb?

Post by abk4523 » Thu 20 Jun, 2019 10:34 pm

Thanks for the quick reply. I have a few ideas.

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leilei
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Re: Is it possible to boot a guest from usb?

Post by leilei » Fri 21 Jun, 2019 3:29 am

abk4523 wrote:
Thu 20 Jun, 2019 8:59 pm
I know some bioses, as early as 486dx2s, can boot from usb.
The earliest BIOS USB booting i've seen were chipsets for Pentium 4 systems.... Are you sure you're not confusing with a floppy-based bootloader? USB wasn't a thing at all in the 486 era implied. CD booting wasn't yet a thing either.

abk4523
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Re: Is it possible to boot a guest from usb?

Post by abk4523 » Fri 21 Jun, 2019 11:48 am

I may have misremembered something. I installed Windows Xp on a 486dx2 laptop from cd, but I don't remember if I used a Windows 98 boot disk.

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leilei
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Re: Is it possible to boot a guest from usb?

Post by leilei » Fri 21 Jun, 2019 1:08 pm

abk4523 wrote:
Fri 21 Jun, 2019 11:48 am
I installed Windows Xp on a 486dx2 laptop from cd
XP will refuse to install and run on anything less than a Pentium.

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ppgrainbow
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Re: Is it possible to boot a guest from usb?

Post by ppgrainbow » Fri 21 Jun, 2019 1:49 pm

abk4523 wrote:
Fri 21 Jun, 2019 11:48 am
I may have misremembered something. I installed Windows Xp on a 486dx2 laptop from cd, but I don't remember if I used a Windows 98 boot disk.
Windows XP is not compatible with processors older than a Pentium processor, because it hard requires CMPXCHG8B and CPUID instructions.

abk4523
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Re: Is it possible to boot a guest from usb?

Post by abk4523 » Fri 21 Jun, 2019 4:02 pm

I know. It worked pretty well for a while but the laptop eventually started locking up after logging in.

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ppgrainbow
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Re: Is it possible to boot a guest from usb?

Post by ppgrainbow » Fri 21 Jun, 2019 4:09 pm

abk4523 wrote:
Fri 21 Jun, 2019 4:02 pm
I know. It worked pretty well for a while but the laptop eventually started locking up after logging in.
It would only work if the processor was at least a Pentium Overdrive. :p

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leilei
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Re: Is it possible to boot a guest from usb?

Post by leilei » Fri 21 Jun, 2019 9:36 pm

abk4523 wrote:
Fri 21 Jun, 2019 4:02 pm
I know. It worked pretty well for a while but the laptop eventually started locking up after logging in.
The behavior would be XP throwing a trap exception before the boot splash could even show up.

abk4523
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Re: Is it possible to boot a guest from usb?

Post by abk4523 » Sat 22 Jun, 2019 6:07 pm

My mistake. It was a Pentium II board though I am not sure what chip it used.

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