Subject: Re: RL01 support in NetBSD?
To: Chuck McManis <>
From: Greg Ingram <>
List: port-vax
Date: 02/17/2000 13:51:49
On Thu, 17 Feb 2000, Chuck McManis wrote:

> Shouldn't be that hard to add, the RLV21 controller would be pretty easy to
> write a simple driver for. I
> --Chuck
> At 08:15 PM 2/17/00 +0100, Anders Magnusson wrote:
> >> 
> >> Can NetBSD drive an RL01?
> >> 
> >No. RL01??? Sitting on which type of ctlr?
> >
> >-- Ragge

Okay, I'll spill the rest of the story.  Just don't yell at me.  :)

I'm trying to resurrect a PDP11.  It's Qbus.  My VAX is Qbus.  I'm lead to
believe that _some_ boards will work in either system.  My RX02 drives on
the PDP11 appear to be dead so my only mass storage is an RL01.

If the VAX could write to the RL01, I think I could build a a workable
filesystem for the PDP11.

The RL01 looks homebrew.  The interface card is non-DEC; it's from Sigma
Information Systems. It connects to a XEBEC winchester disk controller
with a long 50-pin ribbon cable.  The i/f card has a couple of interesting
large chips from AMD (AM2901APC).  I've got docs for the XEBEC controller
and the Rodime drive, but, naturally, not for the Sigma controller.

But it _acts_ like an RL01. I can bootstrap it:

	RT-11FB (S) V05.01
	?KMON-U-Overlay read error


As you can see, though, there's a little problem with the OS.  And I'd
rather run Unix anyway.


- Greg

ps:  Did I mention that I'd also then like r/w support for the RT-11
filesystem for NetBSD?  Ouch!  Stop that.