Old MFM controller on a PCI bus machine

From: Curt Vendel <curt_at_atarimuseum.com>
Date: Mon Jan 26 14:18:00 2004

I guess if you shut off the onboard controllers, freeing up IRQ 14 and
15 it should work. C800 should still work/act the same way to run the
MFM controller bios. Floppy is on IRQ 6 so no effect there.


Vintage Computer Festival wrote:

>I haven't played with MFM hard drives and controllers in a LONG time
>(about 10 years now) so I have some questions.
>I'll start off easy. Should there be any reason an old 16-bit ISA MFM
>controller won't work properly in a Pentium-class PC with ISA and PCI
>slots? I imagine I would just have to configure the BIOS to reserve the
>proper interrupt (I believe it's 14, correct?) for the MFM controller.
>I did all this but the MFM controller wreaked havoc on the system. It
>killed the on-board floppy disk and IDE controllers (not physically killed
>but basically disabled them and the system couldn't boot).
>I'm trying to determine if there is a natural conflict before I venture
>forth with this configuration. This may be a problem related to the PC
>I'm trying to plug the card into because there are other oddities with the
>IDE controller that is preventing the system from booting with 4 hard
>drives installed (2 per IDE interface). It halts after it auto-recognizes
>the drives on the primary controller. Weird.
>Anyway, any insight would be appreciated.
>I'm going to do more experimentation in the meantime. I'll get another PC
>with ISA and PCI slots to work with, and will also find an old 386 to test
>the MFM controller on to make sure it is working fine.

Curt Vendel & Karl Morris
The Atari Museum
The Atari Explorer
Received on Mon Jan 26 2004 - 14:18:00 GMT

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