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u/OverUnderDone_

r/VintageComputers r/PDP11 r/retrocomputing
▲ 13 r/PDP11+1 crossposts

PDP11/xx on FPGA - From a Tang to a Xilinx Zynq

This moved quickly - I don't have a larger Sipeed board yet, so I dug out an old Zynq 7000 CPU+FPGA board from the cupboard. Bought it years ago but never find the app that would suit it. *until now*

I have it booting RT-11 from an SD card dedicated to the PDP, hardware serial console and 4MB RAM. I am currently adding 3 other serial ports to the Linux fabric with a tu58 emulator on serial1

Next: Move SD card to an RL02 bridge inside linux. My homage to blinken lights on a 8x8 LED grid. After that, its a larger hard drive controller emulation and then ethernet.

https://i.redd.it/uceblsfk7pih1.gif

reddit.com
u/OverUnderDone_ — 9 days ago
▲ 11 r/retrocomputing

PDP11/44 in a Sipeed Tang Nano FPGA - Installing and Booting RT11

Just for fun, Having never touched a PDP in my life, I decided to port over some amazing PDP VHDL code from Sytse. I had a lonely Tang Nano 9K just collecting dust!.

I mashed in some HyperRAM controller and got it all booting. a PDP11/44 with 1MB RAM RT-11 v5 on Emulated RL02 drives. The full install in the video. Next is publishing code, and making a mini enclosure that can house 4 DB-9 serial ports. (Inspired by Daves Garage, Usagi and Sytse for all the fpga goodness)

youtu.be
u/OverUnderDone_ — 20 days ago