Disable onboard SCSI-II modul on A4000T

[BuzzBrain]

Hi.

A friend of mine, have a A4000T and only want to use
the IDE port.

We have conneted a IDE drive. But it dosen't boot.
When I connet a scsi disk on..it boots. (both ide and a scsi disk) But the IDE disk have the boot partision.

Loocks like it want a termination or something on the scsi card?

I know it's 8 dip switch back on the scsi card. But we don't have the user manual. and I cant find any info on internett

Can you disable the scsi card?


Can any help?

Thanks

BuzzBrain

[Zac67]

From the service manual:
SW200:
8-RESERVED
7-EXT_TERM
6-SYNCH_MODE
5-LONG_SPINUP
4-SCSI_FAST
3-SCSI_ADR2
2-SCSI_ADR1
1-SCSI_ADR0

When it doesn't boot - do you get a boot prompt screen or just nothing? The former would indicate that your IDE drive isn't flagged as bootable...

[Jeff]

In my experience the IDE can be troublesome on some A4000Ts. A fool proof solution is to use ROMS from the A4000D computer if you want to disable the on board SCSI. This works quite well. I bought a machine that had been configured in this way and I could not figure out why at first.  It makes the IDE much for reliable at least one of my A4KTs. Also you may not be waiting long enough for the IDE. Connect the IDE drive and wait several minutes looking at the black screen, the machine may still boot if you have it configured properly!

Someone else will probably tell you the IDE on there machine works just fine, but one of mine sure doesn't seem to:-D

What I ended up doing was to connect an IDE CD-R drive as master on the IDE buss (without a hard drive) and use the SCSI for my boot and system drives. This way the machine seems to work fine with the correct ROMS installed. Also make sure you terminate everything properly if you are using SCSI.

YMMV Good Luck,
Jeff

[Jose]

Hi, I think the solution might be installing IDEFix. That is, if it's possible at all, since you can't access the disk in the 1st place, maybe try with WinUAE or another amiga. I've had a similar problem and ended up buying one of those awesome scsi to ide adapters on eBay becasuse it's also much faster and uses DMA.