LMARV-1 reboot part 11: The crossbar 

That's probably a good idea, even if I don't need it. Because what if I do? :)

That's an interesting idea! I was going to be lazy and just hope, but maybe I can just 3D print some brackets/slots. I'm enthusiastic!

@@RobertBaruch 3D printed also works, if it's worth your time!

There was a reason... Oh right. The implementation shifts mtvec right by 2, adds the cause, then shifts the result left by 2. This is equivalent to masking off mtvec, multiplying the cause by 4, and adding.

I was thinking the exact same thing. From riscv-privileged-v1.9.1.pdf page 28: "The value in the mtvec register must always be aligned on a 4-byte boundary (the low two bits are always zero)"

@@RobertBaruch Ah, that makes sense now. It's an implementation detail.

Hammer solve everything.

I suppose? It could be long and boring...

@@RobertBaruch I do not think it's boring, not at all.

We want to see it all 😄

Derg happen.

@@RobertBaruch actually resemble the "Goat" from Dante's Inferno, hope I wont have a nightmare, hah joking BTW incredible stuff, hope to see it completed and see videos saying "inspired by R. B. " as many bboard vids on yt. ... back to watching your video. cheers.

@@alessiocaffi5992 Oh interesting, I didn't know people were actually being inspired by this. That's good to know!

@@RobertBaruch I am sure you gonna inspire few of us, but, sorry, not as many as this ,easy to follow, bboard ttl cpu enthusiast (in reality a good series on teaching a SAP-1 by Malvino) cause you are on another planet, maybe in Andromeda. I am an EE and barely can keep up, gotta review nMigen , haaa. greetings. ps. no nightmare.

Soon.

I'm intrigued by the ATF1502ASV. It seems to be sized well, and uses 3v3 power. I'll look into this more, because it is not that much more complex than the 22V10, and could conceivably have its fuse map reverse-engineered.

@@RobertBaruch I've used the ATF150x CPLDs in a couple of projects, 5V and 3V3 parts. You can write CUPL for them using WinCUPL, or you can use an older version of Altera Quartus that supports the EPM7000 family of devices to write Verilog or VHDL, and then use pof2jed to convert to a format for programming via ATMISP. You just choose the equivalent Altera part in Quartus: EPM7032==ATF1502, EPM7064==ATF1504, EPM7128==ATF1508. Pin for pin compatible.

ATDH1150USB is the programmer to look for, they are not stupidly priced like Altera's programming tools.

@@TomStorey96 Compared to those, this is pretty cheap.

I eated it.

Well, you're not totally wrong. Horse heads and dragon heads have numerous similar features. On the other hand, horses, even weird ones, usually don't have horns, slit pupils, and fangs :D

@@RobertBaruch Aha! Well, maybe horses do where I'm from! At least the weird ones. Anyways, nice video. Looking forward to the next one!