How to connect ST-506 HD to PDP-11/23 M7555

[davepl1968]

I've assembled the guts of an 11/23 in a backplane and connected it to a front panel, and have it coming up to the boot prompt.

I have an HD with an image of RT/11 on it (or maybe RTS), but the M7555 has a 50-pin cable and the drive is the standard 2-cable ST-506.

I think there's a plane in the 11/23 chassis that does this interconnect, but I don't have a chassis. Is there any way I can connect the drive? Does anyone make a cable, or does anyone have anything that'd work?

Thanks!

 

[pbirkel@gmail.com]

Take a look at https://avitech.com.au/?page_id=645 for ideas.

 

[PG31]

Hi, Maybe take a look in the DEC specific forum and possibly re-post https://forum.vcfed.org/index.php?forums/dec/

 

[daver2]

Yes, the controller connects to a 'breakout PCB' that produces the sockets for both floppy and hard drives.

I am going to annoy you now, but a couple of weeks ago I disposed of a BA23 chassis. The PSU had failed. You could have had either that entire unit, or I could have scavenged the breakout PCB for you. I went into the office yesterday and it had gone I am afraid. Sorry.

Dave

 

[pbirkel@gmail.com]

There's also a module-based version, the M9058. Example:

Digital DEC M9058, Distribution Board to 4 drives, fits BA 123,124, Q Bus | eBay

Find many great new & used options and get the best deals for Digital DEC M9058, Distribution Board to 4 drives, fits BA 123,124, Q Bus at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[commodorejohn]

There are other solutions as well. My 11 has (IIRC) a SCSI HDD running through a SCSI-to-MSCP adapter connected to a QBus MSCP controller.

 

[davepl1968]

It looks like a 9278 backplane has the connectors I need, whereas the 9275 that I have does not. I've ordered a 9278 in the hopes it will solve my dilemma!

 

[oktology]

I am going to annoy you now, but a couple of weeks ago I disposed of a BA23 chassis.

Yikes. There is nothing PDP that’s scrap anymore.