Webster WQSMD/04 Qbus SMD Controller

Zane Healy healyzh at aracnet.com
Sun Dec 13 11:06:46 CST 2015

> On Dec 12, 2015, at 11:40 PM, Robert Jarratt <robert.jarratt at ntlworld.com> wrote:
> I picked up some Qbus cards yesterday. They seem to be board set for a
> MicroVAX II. However, one of the cards was, to me at least, a bit unusual.
> It was made by a company called Webster, and it appears to be a controller
> for SMD disks. I was not familiar with SMD disks and had to look them up. I
> suspect this might be a little out of the ordinary, and, possibly, an odd
> combination for a small Qbus system to access such a physically large type
> of disk. Were MicroVAX IIs used much with such disks? Is this a bit of an
> unusual find?

I’ve used the WQESD/04 card on my PDP-11/73, if you don’t have SCSI, and have ESDI drive, it totally rocks!  If you have SMD drives to plug into this, you can probably make one drive appear as several drives.

I’ve sense upgraded to a SCSI card, and use removable drive trays.


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