Hello everyone
I have a Seagate ST-250R hard drive and got the information that this is actually a drive for RLL encoding and not an MFM
So I searched around and came to the knowledge that the best controller for this drive is the ST-11R since this drive uses some special 31 sectors per track or so and many controllers dont support this feature.
I got my hands on a ST-11R but there seems to be a problem since the BIOS utility the card only shows me a handful of MFM type drives as possible choices.. no "R" drive is available.
Using the "debug" command in DOS the ROM BIOS utility gave me 6 possible drive types to use and I ended up formatting the drive as a ST-225 which it did fine ... the drive now boots fine with DOS 5.0 and has 20MB.
My question is.. did I buy the wrong controller ? is this a ST-11 and not an ST-11R ? I thought there existed only one controller
On the card there are two ROM chips one has a saying "ST-11" and the other chip says "ST-11R microcode" so to the best of my knowledge there is some "R" into it
The board has absolutely no jumpers except the ROM start address and that doesn't seem to have any influence
Can someone with knowledge in this type of technology help ?
The controller technical manual from seagate there is around always seem to give the idea that there is only one single type of controller that is called "ST-11M/ST-11R"
I will post a picture of the controller asap
Thank you
Nuno
I have a Seagate ST-250R hard drive and got the information that this is actually a drive for RLL encoding and not an MFM
So I searched around and came to the knowledge that the best controller for this drive is the ST-11R since this drive uses some special 31 sectors per track or so and many controllers dont support this feature.
I got my hands on a ST-11R but there seems to be a problem since the BIOS utility the card only shows me a handful of MFM type drives as possible choices.. no "R" drive is available.
Using the "debug" command in DOS the ROM BIOS utility gave me 6 possible drive types to use and I ended up formatting the drive as a ST-225 which it did fine ... the drive now boots fine with DOS 5.0 and has 20MB.
My question is.. did I buy the wrong controller ? is this a ST-11 and not an ST-11R ? I thought there existed only one controller
On the card there are two ROM chips one has a saying "ST-11" and the other chip says "ST-11R microcode" so to the best of my knowledge there is some "R" into it
The board has absolutely no jumpers except the ROM start address and that doesn't seem to have any influence
Can someone with knowledge in this type of technology help ?
The controller technical manual from seagate there is around always seem to give the idea that there is only one single type of controller that is called "ST-11M/ST-11R"
I will post a picture of the controller asap
Thank you
Nuno