hard-sector 5 1/4 disk

I recall the Amiga having a high-density external disk addon that ran at 1/2 speed so Commodore wouldn't have to include a faster fdd controller chip. The bad news. The good news is that it worked on all Amiga machines right out of the box. The ATR8000 and ATR8500 CP/M boxes DO for Certain use the index hole to time the drive's rotation to determine if it is an 8" or a 5.25" mech running. I've used a couple of 3.5" high-density drives on them and gotten up to 1.35mb in CP/M and 1mb in Spartados. The trick is getting a 3.5" mech that has a big ol' block of jumpers on it. You can fiddle with the jumpers and make the drive emulate a 77track 8" mech. As for the index hole, this wasn't such a bad thing unless you wanted to use 'flippy' disks in an ATR. Atari drives don't use the hole at all so flipping the disk works fine. With the ATR as a controller though you have to punch another index hole in the disk or use a standard mech with dual sets of index hole sensor such as those 'flippy' drives made by Pertec and Aerocomp -never seen em', I just know they made them. And then there are these freaky 3" disks I have for an Amstrad I once owned..... Regards, Jeff In <10110302019.ZM26540(a)mindy.dunnington.u-net.com>om>, on 10/30/01 at 08:19 PM, pete(a)dunnington.u-net.com (Pete Turnbull) said: -- ----------------------------------------------------------- Jeffrey S. Worley Asheville, NC USA 828-6984887 UberTechnoid(a)Home.com -----------------------------------------------------------