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POST hang on 486 with PCI IDE/SCSI card

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First post, by turbooo

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I’m trying to install a PCI IDE controller on my MB-1433UHT-A, as it does not have an onboard one. I’m using a Promise Ultra 100 but when the card is installed the system hangs during the POST procedure, after completing the memory check. I see the last code on the diagnostic card is 53 (Award 4.50G BIOS)

Things I’ve tried so far, with the same result:
- moving the card to different slots
- move video card to ISA so it the controller card is the only one on PCI
- swap for a FastTrak 66
- swap for a 2940UW
- swap out the RAM

Once the card is removed the system is able to complete POST. Also no issue with a VLB controller card.

Any thoughts what might help get past this issue?

Reply 1 of 2, by Meatball

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I'm guessing your board is not capable of supporting PCI 2.1 and/or bus mastering based on failure of operation of the 2940UW and Promise 66/100 controllers. The 2940UW requires bus mastering and PCI 2.1. The Promise controllers might be the same.

Reply 2 of 2, by turbooo

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Hmm, thanks for the feedback. There are options in the power management section labeled “PCI Master(1-4) Check” so was under the impression that there was some degree of support, but maybe that option means something else.

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