Rescue update: DEC RC-25s + / was Re: DEC cartridge ID

Joseph Lang joe.lang.0000 at
Mon Jun 8 09:27:09 CDT 2015

Take a look at the tu81 manual on bitsavers ek_tu81-tm_002_nov85.pdf
The appendix describes the m8739 unibus klesi. It's tmscp but it applies to mscp as well.


On Jun 8, 2015, at 9:27 AM, "Robert Armstrong" <bob at> wrote:

>> tony duell [mailto:ard at] wrote:
>> Is the KLESI printset on-line anywhere?
>  The schematics are online (sounds like they've been found now), but that
> only tells you the electrical interface between the controller and the
> drive.  That part's pretty simple (which is why it looks attractive to build
> a LESI disk emulator gizmo), but it doesn't tell you anything about the
> protocol the drive and host use to talk to each other.  Another cctalk
> reader has suggested privately that the drives actually speak MSCP directly,
> and that's the software interface between the two.  I guess I'm going to
> have to read up on MSCP - I don't know enough about it to know if that's
> true or even possible.
> Bob

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