mark.freedman@canremote.uucp (MARK FREEDMAN) (02/14/90)
>I have an old Xerox 820 CP/M machine with lots of files created in >conversion, but my PC drives >can't handle Xerox SSSD disks. The jE>There are at least two commercial products that will let you read jE>Xerox and all other CP/M disks on a pc. One is Uniform-PC, the other jE>is Media Master. I don't have the coordinates handy for the I'm quite certain that the drive controller in the PC won't handle single-density formats. It's a hardware limitation designed into the board. mark.freedman@canremote.uucp --- ~ DeLuxe 1.11a20 #4219 Perfection is our MINIMUM stadnard ...
jdudeck@polyslo.CalPoly.EDU (John R. Dudeck) (02/15/90)
>In a previous article I wrote: >>There are at least two commercial products that will let you read >>Xerox and all other CP/M disks on a pc. One is Uniform-PC, the other >>is Media Master. I don't have the coordinates handy for the >To which Mark Freedman responds: > I'm quite certain that the drive controller in the PC won't handle >single-density formats. It's a hardware limitation designed into the >board. Yes, of course that is true. I exaggerated sligtly. I figured that given the distance back in history that it has receded to, it really doesn't matter that much. It also won't read the hard-sector formats such as Heath and North Star. Uniform-PC will also read odd DOS formats such as Rainbow 80T SS and Sharp 3.5" 40T. While on the subject, Uniform-PC will format DEC RX50 diskettes which are used on the DEC Micro-PDP11 series. The PDP's are incapable of formatting floppies, so if you don't want to pay through the schnozz you can just buy cheap PC disks and format them on an AT 80T drive using the Rainbow format. It works fine. -- John Dudeck "You want to read the code closely..." jdudeck@Polyslo.CalPoly.Edu -- C. Staley, in OS course, teaching ESL: 62013975 Tel: 805-545-9549 Tanenbaum's MINIX operating system.
ken@cs.rochester.edu (Ken Yap) (02/15/90)
|>In a previous article I wrote: |>>There are at least two commercial products that will let you read |>>Xerox and all other CP/M disks on a pc. One is Uniform-PC, the other |>>is Media Master. I don't have the coordinates handy for the | |>To which Mark Freedman responds: |> I'm quite certain that the drive controller in the PC won't handle |>single-density formats. It's a hardware limitation designed into the |>board. | |Yes, of course that is true. I exaggerated sligtly. I figured that |given the distance back in history that it has receded to, it really |doesn't matter that much. It also won't read the hard-sector formats |such as Heath and North Star. Uniform-PC will also read |odd DOS formats such as Rainbow 80T SS and Sharp 3.5" 40T. No, no, wait a moment, don't fold your cards so fast. The manual for the 22DISK program by Sydex, which is for reading CP/M disks on MS-DOS says that the IBM floppy controller can read 3740 format recorded disks (which is what single density means I assume). I also looked at the data sheet for the 765 floppy controller chip and indeed it has this mode. But the catch is this: you have to make a simple hardware patch between the controller to the demodulator chip (?) to enable this mode. The details of this patch are in the 22DISK documentation. 22DSK is in the Simtel archives and slave archives too, I presume.