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framer
August 24th, 2013, 07:58 PM
I got this nice HD but I can only get it to format to 20MB

I have an 8 bit WD1002A-WX1 and a WDXT-GEN . Is the problem the controllers? What controller do I need?


Thanks.

framer

modem7
August 24th, 2013, 08:34 PM
I got this nice HD but I can only get it to format to 20MB
I have an 8 bit WD1002A-WX1 and a WDXT-GEN . Is the problem the controllers? What controller do I need?
94155-67: MFM (ST506/ST412 interface), 925 clinders, 7 heads, uses 17 SPT.

So you need a MFM controller that supports a drive geometry of 925 clinders, 7 heads, and uses 17 SPT.

Both the WD1002A-WX1 and WDXT-GEN were supplied with various ROM revisions. The ROM revision defines what drive geometries are supported.

What is the ROM revision on the WD1002A-WX1. It will be something like '62-000013-010'. Hopefully it starts with '62-000094' because on a WD1002A-WX1, that ROM is the 'SUPERBIOS' and is 'dynamic' (during low level format, it will prompt you for cylinder/head count).

What is the ROM revision on the WDXT-GEN. Look for the 'F' number, e.g F335, which is somewhere on the card. Hopefully you have the F300, because that ROM is 'dynamic' (during low level format, it will prompt you for cylinder/head count).

cr1901
August 24th, 2013, 11:31 PM
WDXT-GEN should support any hard drive you throw at it. Just open debug, enter g=c800:0005 and away you go!

modem7
August 25th, 2013, 12:13 AM
WDXT-GEN should support any hard drive you throw at it. Just open debug, enter g=c800:0005 and away you go!
Not according to the WDXT-GEN User's Guide, which can be found [here (http://www.vintagecomputer.net/ibm/wdxt-GEN_controller/WDXT-GEN_Winchester_Disk_Controller.pdf)].
Only the 'F300 feature' version has dynamic functionality.

framer
August 25th, 2013, 08:35 AM
Not according to the WDXT-GEN User's Guide, which can be found [here (http://www.vintagecomputer.net/ibm/wdxt-GEN_controller/WDXT-GEN_Winchester_Disk_Controller.pdf)].
Only the 'F300 feature' version has dynamic functionality.

Just the info I needed. Doc's are where it at. I had an F300. The drive had been set up in an AT using a type 12 drive but I see that it even bigger at 60MB. I LLF'd it to two 30MB drives. I now have a clean XT that looks like an XT. Now on to programming it.

Thanks for the assist.

framer