[Coco] Re: 512K vs disk copy
rayanddoraleew at earthlink.net
Sun Aug 22 22:14:29 EDT 2004
Robert Emery wrote:
>Most 3.5" floppy drives are hardwired as drive 1, or B:.
**** I dunno about that , Bob. I've used about a dozen 3.5" drives
from 5 different companies on my CoCo's. They all could could be
jumpered for drive #0 - 3. The NEC drives (my favorites) may have
looked hard wired because they used a miniature 4-position switch
"hidden" under the case for drive selection. The switch could be
reached with a small screwdriver and an educated guess for selection.
>My advice, if you want to be able to boot from a 3.5" floppy is to leave the
>drives jumpered as-is (5.25=/d0, 3.5=/d1), but intercept the drive select lines
>coming out of the controller and use a toggle switch to swap them at will. Then
>you can boot from either drive.
**** It is easy to make a 3.5", 720k boot disk if you have EZGen or
KwikGen. If I recall correctly, you can also use the stock OS9Gen. A
convoluted method of making a 720k boot disk was presented by Dr ASCII
in The Rainbow back about 1988. I believe I used that method for my
first boot disk. Of course, once you have one boot disk, you can mess
around with the modules and make more with Cobbler.
>As far as floppy disks, you can use HD disks for temporary backups if you cover
>the HD hole or glue the (non-optical) switch in the drive down. The disks I've
>used this way start developing errors after a few weeks, but they *may* have
>also been too close to a magnet. Not enough real experimentation to draw any
>conclusion other than "be careful".
**** Cheers, Griz
More information about the Coco