DECmate II disk image tooling?
rick at rickmurphy.net
Sat Mar 12 19:11:32 CST 2022
On 3/12/2022 3:20 PM, David Schmidt via cctech wrote:
> I have some disks that look like they're from a DECmate II computer,
> standard RX50K drives. The disk images all look like they're a mix of
> 12-bit (OS/78 or OS/278?) and 8-bit all on the same media. I can't
> convince PUTR to make sense of the images, so I'm wondering if there is
> anything else out there that is likely to be able to examine the disk
> contents? I'm really looking for PUTR-like functionality to list and copy
Since it's a DECMate II, these may be WPS disks.
At least for the RX01/RX02, Those are 8-bit mode except for the boot
sector (because the standard boot was for a 12-bit mode disk.) I don't
know the layout for the RX50 - since it's not using the RX boot, there
shouldn't have been a need for a 12-bit boot sector.
It's also possible they're COS-310 disks, which also were 8-bit mode.
Using byte mode allowed WPS and COS to use the full capacity of the
disks. Apparently the RX50 controller retained this wasteful 12-bit mode.
> Maybe SIMH could be configured to be a DECmate II and be fed the disks?
SIMH doesn't have an emulation for the RX50 controller on the DM2.
There's probably a different interleave being used here, so decoding the
layout would be a matter of trial-and-error.
The specs for the RX50 controller are available -
That means that an emulator is possible.
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