On Tue, 9 Apr 2002, Cameron Kaiser wrote:
> I installed a PC HD 5.25" floppy in my long-suffering PCjr by replacing the
> old IBM drive. It all seems to work on DD disks, but not HD disks.
> Do I need
> to upgrade something else? (being somewhat ignorant on old PCs).
Yes. the computer.
Welcome to one of the least popular collectibles - the Edsel of CC.
The disk controller only does "DD". It operates at a 250K data transfer
rate, and was intended to work with 360K drives ONLY.
A 720K drive (either 3.5" or 5.25") will work with it just fine, except
that it isn't supported by PC-DOS 2.10. If you switch to PC-DOS 3.20 or
above, then it'll work with DRIVER.SYS.
Or, look for the bizarre Weltec 1.2M drive for XTs. It was a strange 1.2M
5.25" drive that ran at 180 RPM instead of 360RPM, for the specific
purpose of being able to get 1.2M drive on controllers that don't support
'em. They were not exceptionally reliable, and the "special" software for
it might not work on the Jr.
BTW, the disk controller will support two drives.
If you expand the RAM further (with a 512k sidecar), then you might be
able to run Windows 3.0 on it if you are willing to devote some time and
effort to configure it.
--
Grumpy Ol' Fred cisin_at_xenosoft.com
Received on Tue Apr 09 2002 - 19:12:18 BST