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Hi, I have Model 3, with a couple of 5.25" floppies that I'm looking for some help with. I think it was originally someone's parts machine (mismatched components, missing screws, etc), and it has one Tandon TM100-1A (drive 0) and a Texas Peripherals (TPI) clone (drive 1). Both drives struggle...

Hi, I'm having a bit of a fun getting my head around the PDP-11 memory model, hopefully someone can help. The setup is as follows: I'm using SIMH to emulate an 11/53 with 256K of RAM. This is running RT-11 v5.0.3 with the XM monitor from an RL02. I'm trying to run a cross assembler written...

Hi all, I'm looking for information about the Sigma Information Systems 400185 QBUS dual hard drive controller. I believe that it may also be known as the SDC-RL11 or SDC-RLV11. I have found the manuals for the SDC-RLV12 - 400250 and SDC-RLV112 - 400320, however, when it comes to the 400185...

Hey, Apologies I'm a bit of a PDP-11 noob. I'm trying to set up Simh on Linux running RT-11 v5.3 and use VTCOM to communicate over a physical serial port (actually a USB/serial adapter) to an RS-232 peripheral that runs at 9600-8-n. Having installed the O/S on a virtual RD52 with the XM...