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Thank you! This is precious information. I understand that my journey for a unibus pdp 11 will be way harder than I thought

That's a good idea but unfortunately I dont think that's an option for me. I'm planning on using the emulator in an environment where 'realistic' execution time should have somewhat of a meaning. So having micro ODT as a normal memory mapped program would make that generalization that much easier.

Thank you! If it's normal instructions I should be able to run it. Not sure about converting verilog to software since I'm working with rust with webassembly.

Thank you, this is really helpful, I'll probably take this approach.

Thank you that will be really helpful!

Thank you, I guess I'll go about implementing it in high level code then. I was hoping that there would have been a way to abstract the cpu to just an instruction executer and the microcode as just some code in memory space.

I'm trying to write a PDP-11 emulator that emulates a KDF11-BA cpu board. The problem is that I dont know what's the best way to go about emulating the micro-ODT interface. I assume that there are no 'dumps' of the microcode and even if they were they wouldnt be standard opcode instructions so...

I guess I learned the hard way

Both seems like expensive options...

Thank you everyone for the suggestions, I guess I'll have to decide a model and stick with that one. The 11/04 seems the most promising so far.

Yes it was a typo. Thank you for the info, does it require a special backplane too if you know?

After getting my QBUS PDP-11 assembled from boards up and running, I decided to slowly get all the bargains that I can on UNIBUS cards to hopefully (one day) replicate what I did with QBUS, even if I know it'll be much harder. I still have to learn a lot about UNIBUS and I wanted to know your...

I guess this is still relevant to the thread. I've been battling with simh to get a working RT-11 tu58 image, since I havent been able to find one online. I've been trying to follow other threads such as: https://forum.vcfed.org/index.php?threads/creating-a-rt-11-tu58-boot-tape-image.71340/...

It's finally done! After something like two months and a half since getting all the parts together (and starting this thread) I can finally boot into a tape!!! I want to thank you everyone from this forum that helped me with this repair and journey getting to know the pdp-11. A special thanks to...

Ok I removed the slu that may have been the culprit and all boots fine thankfully

Thank you very much!

Another update, I'm kinda understanding this error now. I tried doing some testing with a python script and I finally tracked down when a bit flip would occur. Basically when you write a value in ram at address (1XX) the third bit of the value gets written to (0XX) too (and vice versa). This...

That's amazing! Are there schematics available?

Thank you, I have much reading (and learning) to do. The idea is to make a really cut down version of a qbone that doesn't set you back hundreds of dollars and can emulate one card at a time (an hard disk emulator for example) So having access to DMA would be important for some functions.

Oh right, that's my bad I forgot about that. So the appropriate level shifters may be enough to interface the pi to the qbus if they can handle the right current?