[Scottish] processors

Gordon JC Pearce gordon at gjcp.net
Wed Nov 15 12:55:42 GMT 2006

Claudio Calvelli wrote:
>>> Any use for a PDP-11/73? I haven't switched it on in years but it
>>> does work.
> Apologies I meant PDP-11/53 (actually very similar)
>> What's in it?
> /me goes looking inside the PDP-11
> KDJ11-D/S CPU board with a 15MHz CPU, 1536 (count 'em) kilobytes of RAM,
> two serial ports
> (http://home.alltel.net/engdahl/KDJ11.htm)
> One DHQ11 LINE ASYNC COMMS board, adding 16 more serial ports
> TK50 tape unit and M7546 controller (and one tape)
> Seagate ST-251 40Mb hard drive
> (http://www.seagate.com/support/disc/specs/mfm/st251.html)
> with M7555 RQDX3 MFM disk and floppy controller

Pretty decent spec then.

> Sadly, no M7504 ethernet in it, and given you can buy a new computer for
> the price one of these sell I don't think I'll be putting the PDP-11 on
> the network, unless I can use the 18 serial ports for MLPPP...

I believe RSX-11M may speak DECNet over a serial port.

> No software on it, it appears to have been wiped clean before it reached
> me, but it will run BSD 2.11 if anybody can write a TK50 tape or has a
> QBUS system which can take the TK50 controller.

Have you got any removable media besides the TK50?  I've got RX02s with 
RT-11 on them,  and also some couple of RL02s.  Getting a "real" DEC 
operating system on it wouldn't be a problem ;-)


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