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This is objectively the best comment to that video:

This thread now makes an appearance in the following video:

The floating point unit in the 11/44 had a bunch of the things, according to Wikipedia.

Didn't @monahan_z make an S100 PDP-11 a few years ago?

I was thinking about this while trying to brush up on LINC ASM a little. It seems like the LDA instructions and such make "noise" in AC less of an impediment than they do on the "TAD-only" 8.

It seems this thread has caught some attention!

And I've updated my avatar to celebrate!🎊

Meanwhile, I wish an institution around here would let me do this as work toward a graduate degree! Like, no joke: I would do this toward a masters or beyond at a London university!

It could just be a side-effect, like "We did some work and didn't clean up after ourselves. Some of this is probably useful to you, so we'll just leave that state laying about." It was probably the cheapest solution the LINC could do with the unprecedented budget they'd given themselves...

So if I'm reading that right, it increments both the horizontal and vertical position; and you reset the one you're not advancing in order to either keep printing to the right, or do a CRLF kind of thing?

It was a lot of fun watching your videos on my phone at the pub, and scribbling notes on my copy of the listing. International console-level debugging!

Well, that's quite a relief from our end! The emulator is always easier to repair than the physical machine, of course. I'll keep the extra CLA I just put in, and go do a bit of code-bumming to get the instruction count back down again.

I mentioned over in the "What I did to my PDP-8 today" thread that I've been working on a "HELLORLD!" program for the UMN PDP-12. I got it working perfectly under the SIMH branch @vrs42 is working on in his big SVN repository, and was excited to see it run on "actual germanium". Today @pahp...

Which section is this, and which instructions? I mentioned in the PDP-8 Instructions section that the text was from the PDP-12 documentation. I'm happy to add some sidebar notes with a warning about particular entries, and pointing readers to an overview of the differences if you have such a...

I also have this document, where I spent a while writing up a sort of hasty exegesis for the thing: https://zork.net/pdp8-cookbook/cookbook.html Bonus: if you have your OS/browser set to "light mode" it's in PDP-8 livery, and if you have "dark mode" it's PDP-12 colours!

Ah yeah, this makes sense! I did finally find the bit explaining that the "I" in LINC instructions is "index" addressing through the "low sixteen" that works like the autoincrement 001X addresses on the 8 side. I had read it like the PDP-8's bare "indirect" mode! It's only slightly confusing...

Ah, good point! It never tripped me up for some reason, but I should probably name it hellorld.ini or something, and specify it more explicitly on that command line in the Makefile. Apologies for the strain this could put on your Subversion server: you've got about 400MB of PDFs in there you...

So far the only bug I ran into is that the build system doesn't know to pull in the SDL library paths properly if you just make pdp12 by itself: I have to make pdp1 first so it sets up the build environment for the 1's scope, and then the 12 builds fine! Not something you hit if you just build...