8" drive hooked up to a PC

From: Jerome H. Fine <jhfinexgs2_at_compsys.to>
Date: Thu May 29 13:28:00 2003

>brian roth wrote:

> John has been making these for years.
> Try this link. http://www.dbit.com/fdadap.html
> >>> Innfogra_at_aol.com 05/29/03 12:48PM >>>
> > That way those of us with
> > an 8" hooked to a PC could make 8" disks.
> How do you do this? I am interested.
> What floppy controller do you use? I am assuming it is for the ISA bus?
> Anything for a PCI bus.
> Anything for EISA, I am keeping one EISA bus system.
> Paxton
> Astoria, OR

Jerome Fine replies:

What might have been missed during this exchange is that
for 8" floppy media, DEC had two densities.

The DEC RX01 had the same identical format as the IBM
8" floppy. The RX01 held 494 blocks of 512 bytes each.
As far as I know, there were 4 sectors per block of 128 bytes

That is what John's board at dbit handles - again as far
as I know.

DEC also used a drive call an RX02. Those media
contained 988 blocks of 512 bytes each per 8" floppy.
It is possible to switch between the two densities using
a DEC RX02 drive which can read BOTH. But the
DEC RX01 drive can read only floppy media that have
494 blocks of 512 bytes each.

John, if you are reading this, it would be best if you could
confirm - also even better if you could explain why they
hardware to read the DEC RX02 8" floppy media is
not available on a PC.

Sincerely yours,

Jerome Fine
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Received on Thu May 29 2003 - 13:28:00 BST

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