[Simh] RX50 disks

[Mark Pizzolato]

I’m guessing here, but consider this:  The SIMH disk image format is one where the bytes of data are completely in “logical” sector order.  All disk images connected to the RQ device (even RX50 floppies) are considered SIMH disk images.  Depending on the underlying media, or the tools used to extract them, the data you’ve got may or may not be in logical sector order.  It may be in physical sector order which might include some form of interleave factor.  Additionally, the underlying disk may or may not have 512 byte sectors.  For instance the physical sectors may be 128 bytes each and they may be interleaved around the disk with 4 of them forming a single logical 512 byte sector.

From: Simh [mailto:simh-bounces at trailing-edge.com] On Behalf Of Kevin Handy
Sent: Thursday, January 21, 2016 1:54 PM
To: simh at trailing-edge.com
Subject: [Simh] RX50 disks

I have found some old RX50 disks from DecMate II's, and from MicroPDP11's.
I have used putr to create images of these disks, which should be bootable, but havent been able to boot simh under either system.

The disks were created from a MSDOS system running  putr using
mount b: /foreign
copy /device /file b: xxxx.dsk

The pdp-11 disks appear to have valid text strings (Linus command 'strings xxxx.dsk' shows expected stuff), and the DecMate document disks can be exctracted using my dmprocess program.

Does the pdp-8 simulator handle Decmate bootable system disks? I tried the DecMate WPS system disk, and an os278 disk.neither worked. What command/device to attach them to?
The PDP-11 wouldn't boot the rt11 disks. Version of simh doesn't seem to matter. pb01x.dsk is a rt11 bottable disk (according to the label).

PDP-11 simulator V3.8-1
sim> set rq0 rx50
sim> att rq0 pb01x.dsk
sim> b rq0

Trap stack push abort, PC: 000014 (SUB #162745,-(R5))
sim> exit
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