View Full Version : Tandon 100-4 XT compatible?

Pet Rescue
October 9th, 2013, 11:35 AM
Hi again just a quick question, will a tandon 100-4 be compatible with an IBM XT?

I know the IBM XT uses the tandon 100-2A but will a 100-4 work?

October 9th, 2013, 12:30 PM
Interesting question. That appears to be a 5.25" 80 track * 2 sides drive.

You should be able to connect it to a low-density controller and use it as a 720k drive with low-density media, but you would probably run in to compatiblity issues reading and writing 360k disks. I'm not aware that XT's or DOS know to "double step" when using a 720k drive, since this was never standard in PCs. Then again, some might.

You would be able to read/write the 5.25" 720k disks in a 1.2mb drive, but not a 360k drive.

All of a sudden I wish I had one to play with! :D

October 9th, 2013, 02:02 PM
I did this long ago, using a Micropolis 1115-VI drive on a 5160. It operated fine as a 720K drive. However, a stock PC-AT or above with a 1.2M 5.25" drive will not handle it--it will, instead double-step the drive, which is not what you want. Fortunately, there are some drivers and patches that can get around this.

The question you have to ask yourself is "Is it worth the trouble?"

October 10th, 2013, 09:41 AM
It's worth the trouble to test the drive and say "Yeah it works but chuck is right, don't put that thing in an AT.

October 10th, 2013, 02:07 PM
Is the drive a TM-100-4 or TM-100-4M? If it is the latter, I would like to buy the drive.

I would be useless in any PC/XT/AT type computer but useful in a VG.

Thanks and have a nice day!

Andrew Lynch

Pet Rescue
October 10th, 2013, 02:13 PM
Thanks for all the replies!

Sorry lynchaj it's the TM 100-4 96 tpi and not the TM 100-4m which I believe has 100 tpi