Introduction and need help bringing some pdp11's back

Douglas Taylor dj.taylor4 at comcast.net
Wed Oct 30 10:29:29 CDT 2019


On 10/29/2019 10:14 PM, Chris Zach via cctalk wrote:
> Ok, first hurdle is down. In reading the RQDX3 Controller Module Users 
> Guide it shows that for a BA23 the 50 pin cable goes down under the Q 
> bus chassis then loops straight up into the RQDX3. Which is impossible 
> to do with a modern (hee hee!) 50 pin SCSI ribbon cable as the cable 
> keys are set up so that it would not be possible to plug the cable 
> into the RQDX3 without inverting it (Because DEC likes to sell their 
> cables with upside-down keys). However 30 seconds with a flush cutting 
> pliers allowed me to remove the cam/key from the cable connector and 
> plug it into the RQDX3.
>
> System is now booting up off the floppy. Good step forward. I'll shut 
> it down for now, and get a XXDP+ floppy from Ebay. That should allow 
> me to format a Maxtor RD54 drive and get this thing up to steam.
>
> Bit of progress. Thanks all! :-)
>
> CZ 
I created an XXDP floppy for the RX33 drive in my BA23 based PDP-11/23 
using simh and then copying the image to real floppy using Putr.  It 
seemed brute force.  Is there an easier way?


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