Reading RX01 RT11 directories on a CP/M Machine

[Ragnarock]

I'm trying to restore several pdp11 machines to boot from floppy (H11, SMS11x, MF11) and all fail booting, so I want to confirm my disks are readable, so I'm searching for a utility to read RT11 disks on a standard CPM SSSD 8" drive system. Anyone have a CPM utility to read SSSD RT11 (RX01) disks?

 

[Ragnarock]

Or from an 8" drive connected to a DOS PC that can read SD, I have that too.

 

[krebizfan]

Or from an 8" drive connected to a DOS PC that can read SD, I have that too.

http://www.dbit.com/fdadap.html has PUTR which is supposed to read DEC disks including RT-11. With the exception of RX-02 disks since PC controllers can't switch between single and double density in a track.
For CP/M, the CP/M users group disks have a tool to read RT-11 on CP/M-86 http://www.retroarchive.org/cpm/cdrom/SIMTEL/SIGM/00README.TXT shows it as disk 181.
Hopefully, one of these might help.

 

[Ragnarock]

Thank you, This SIMTEL version of RT11 is the same one written by William C. Colley but modified for CPM86 according to some digging I did in the .cmd file which says:

"copyright (c) 1980, William C. Colley, IIIN converted for CP/M-86 by Craig Davenport - Incitec 2/3/84"

So, I guess for the PC with 5.25" drives running CPM86 which is of no use.

 

[Ragnarock]

The CPM80 version of RT11 by Wm Colley runs on my xerox 820 with 8" drives and attempts to read RT11 disks but just spills out a bunch of jibberish. It's sad because it seems so close to working. I'm fairly sure these disks I'm trying to read are good because imagedisk can read them without errors. But I'd like to get a DIR of them. And ultimately I need a way to move files to/from the RT11 machine if I can ever get one booted.

 

[Ragnarock]

This got resolved by a person on the FB heathkit computer group, he recompiled rt11.com for sectors 1-26 instead of 0-25 or something like that.
Anyway, it works and I can read RT11 disks on my CPM machine (xerox 820). This is a fantastic help to my efforts of getting an RT11 machine booted.

 

[pbirkel@gmail.com]

Can you post the revised COM file(s) here so that others might benefit? Thank you.

 

[Ragnarock]

Here is the CPM utility to read RT11 disks. Of course they have to be SSSD RX01 kinda disks.

The version that worked for me on my xerox 820 CPM machine is RT11-ND1.COM
I moved it over to a CPM disk using my imagedisk machine which has an 8" floppy drive using 22C utility that can read and write CPM files.

Click on 'src' at

GitHub - agn453/RT11: CP/M program to transfer files to and from RT-11 RX01 formatted eight-inch floppies

CP/M program to transfer files to and from RT-11 RX01 formatted eight-inch floppies - GitHub - agn453/RT11: CP/M program to transfer files to and from RT-11 RX01 formatted eight-inch floppies

github.com

 

[pbirkel@gmail.com]

Excellent :-}. Merci beaucoup!

 

[SunshineMan]

I have a CP/M program here that will read RT11 disks (rx01, rx02, rx50) assuming the underlying bios will read the disk