The samples in this post are just beautiful.

C was always just a "high level" assembler. Eventually you have the techniques in your mental toolbox to nudge your compiler in the right direction. Unless you read the K&R deeply you might not even know there is "volatile" and "register" keyword. Then with poking your compiler do you get to find out what it does when you write code with those modifiers.

As a tutorial on how to go about optimizing code youits good, as a practical matter there wasn't much need to tweak this piece of code for a production system. IMHO. Opinions will vary. I always worked in shops where the schedule was always shrinking and deadlines loomed ever closer - optimizing only where it was absolutely needed.

Nice share. My friends using modern Mac’s will like.

This would be something to see. Certainly having a cycle accurate machine would be amazing as the amount of bulky hardware dies off each year. I guess the fPU is not available. I can’t imagine it’s the complexity.

I did mostly a cursory read so it may be the dumbest question. I couldn’t really see if there is an all up system built. Anyone know ?

Model M and Model F - shipped with lots of IBM gear. Searching for docs on specific models is probably more effective than names. Another example is "Thinkpad", that covers a generation of models and documenation and features. some with Big Blue some with Lenovo.

Amazing in the 80s. Upgrade that would give you a scanner on the expensive Imagewriter you already bought.

Fixed. Alas. Siri wants to be a helpful elf but is in fact quite drunk. Seriously. Thanks for pointing this out. Sometimes I my haste to get content on the site mistakes happen. Especially if I post From my mobile.

Is there a language reference. I assume this is like action! In Atari for the idea. At first I thought this was a shark c compiler like. Wetaware or geeen hills C.

Don’t be tricked into thinking this is just a scanned pdf. Lots of pictures and resources like how to use OG paper tape and how to use a 2025 paper tape. If you are pdp curious this is the mouth of the rabbit hole.

Cathode Ray Dude did a video about this. Glimpse at early laptops as they transitioned from the Compaq/Kaypro/IBM luggables.

IBM Made The Longest Laptop Ever https://youtu.be/htl_JbZIcUU?si=LW8hWuk_TX-BN5g_