Simulated disk drive for RT-11?

David Betz dbetz at
Fri Jun 3 10:40:44 CDT 2005

I have a device that plugs into a serial port on a PC and looks like a 
disk drive to an Atari 800. Is there such a thing for RT-11? It seems 
like it should be possible to write a disk driver that uses a serial 
port and some sort of serial protocol to communicate with a PC and make 
RT-11 think it is accessing a local disk drive. Has anyone done 
anything like that? I have a PDP-11/23 system that is taking up too 
much space and I would like to replace it with a small QBus backplane 
containing an 11/23 CPU, some memory and a multi-port serial card. I 
would use one serial port as the console and another as the "disk" 
connection back to a PC. Has this been done before?

Another related question is what is the smallest QBus backplane mounted 
in a box with a power supply that will support an 11/23 CPU (M8186), a 
memory card (M8044) and a serial port/boot rom card (M8047) and maybe a 
multi-port serial card (M8043)?


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