2 ISA video cards w/ 2 Photon sessions

Hi,

I have read success stories about getting multiple (2) Photon sessions
to run on systems with multple PCI video cards. Is there any limitations
on getting multiple Photon sessions to run over 2 ISA video cards,
assuming there is a QNX/Photon driver for the ISA video card. I have
read that Windows, Linux, etc only claim to support something like this
if the video cards are PCI or AGP, and was wondering if there is some
QNX/Photon limitation of ISA for providing this kind of functionality.
Has anybody had success with this?

Thanks,
Paul

Paul Wierenga <pwierenga@questertangent.com> wrote:

Hi,

I have read success stories about getting multiple (2) Photon sessions
to run on systems with multple PCI video cards. Is there any limitations
on getting multiple Photon sessions to run over 2 ISA video cards,
assuming there is a QNX/Photon driver for the ISA video card. I have
read that Windows, Linux, etc only claim to support something like this
if the video cards are PCI or AGP, and was wondering if there is some
QNX/Photon limitation of ISA for providing this kind of functionality.
Has anybody had success with this?

I think that would be impossible, from a hardware perspective.
You can only have one ISA VGA-compatible device, in the system at
a time, since the memory and I/O bases are fixed, and would conflict.

It works for PCI/AGP, because the video cards have memory and I/O
apertures that can be mapped so as not to conflict.

The only way it could work is if there was some kind of non-vga
ISA graphics device out there, but Photon supports no such device.

Remember, ISA/VGA was designed in the early 80’s :wink:

Dave