QBUS RLV12 and the VAX

[Zane H. Healy]

At 10:02 AM -0500 9/21/05, Patrick Finnegan wrote:
>On Tuesday 20 September 2005 22:20, todd at compusleuth.com wrote:
>>  Curt:
>>        I saw an old post of yours from 2003 included below, about the
>>  RLV12.
>>
>>        I am working on a hobby/project to copy a large collection of
>>  my old software from RL02. I was wondering if you ever got your RLV12
>>  to work with the VAX? I was under the impression that because the
>>  RLV12 controler was old PDP11 DMA it could not handle the VAX MMU, so
>>  the DMA would write the data to the wrong area of memory? I do know
>>  that DEC never supported the RLV12 with any QBUS VAX.
>
>I'm not Curt, but I'll answer anyways.  BTW, your email address looks
>familiar. ;)
>
>The RLV11 doesn't work on a VAX, because it can only do 18-bit
>addressing, not 22-bit addressing.  The RLV12 works fine on a VAX, as
>SRM and VMS both identify it, and use it properly.  I've made images of
>quite a few RL02 carts using VMS's BACKUP/PHYSICAL command.

I have a MicroVAX III that specifically exists for this (the downside 
being it's so far back in my one storage unit it isn't funny).  I've 
had both RL01 and RL02 drives hooked up to it, and read both types of 
carts successfully.

		Zane


-- 
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| Zane H. Healy                    | UNIX Systems Administrator |
| healyzh at aracnet.com (primary)    | OpenVMS Enthusiast         |
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