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Ethan Blanton

@elb@social.sdf.org
mastodon 4.7.3
  • Open on social.sdf.org

I'm here for old computers, radios, and cool nerdery.

I identify with #Unix #Linux #HamRadio #retrocomputing and #making.

Professionally I am a computer scientist, now primarily an educator of college students. I am a #SystemsProgrammer with deep experience in #networking, #EmbeddedSystems, and #OperatingSystems. I have also worked in #security from time to time.

The operating system you're using has code written by people who were consulting documents that I co-authored to get it right.

363 Followers
110 Following
40 Posts
Joined November 24, 2022
Web:
https://lostbits.net/elb/
Alt:
https://mastodon.sdf.org/@elb
SDF:
elb
Open post
Ethan Blanton @elb@social.sdf.org
· 2mo ago

Hey look, @veronica@explains.social put out a video on a subject I've spent a lot of time with: AIM and the OSCAR servers. https://www.youtube.com/watch?v=VDQTuJWST4M

She also teased a future post about @pidgin@fosstodon.org, which I look forward to.

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Open post
Ethan Blanton @elb@social.sdf.org
· 2w ago
Replying to
higher ed, pedagogy, assessment, LLMs, sloperators
I'm seeing numerous students who cannot make a – literally three line – function even COMPILE, given two hours. Not pass the tests, just compile. Yet they have nearly perfect scores on everything they've handed in so far! Friends don't let friends use AI and call it "education". 3/3
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago

I don't know who needs to see this, but here's an UltraSPARC III cpu module. #retrocomputing #SPARC #SunMicrosystems

social.sdf.org

SDF Social

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Open post
Ethan Blanton @elb@social.sdf.org
· 2w ago
Replying to
higher ed, pedagogy, assessment, LLMs, sloperators
On the other hand, the distance between vibe coding up a small programming assignment and writing a trivial function under observation seems to have expanded greatly. Without any hard evidence, based only on anecdotes, it seems like the old methods of cheating (Stack Overflow, exchanging notes and small amounts of code with friends, etc.) led to SOME level of learning, while sloperating leads to ... none at all. 2/
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Open post
Ethan Blanton @elb@social.sdf.org
· 6mo ago

You can tell that Typst is a successful LaTeX competitor because when I'm done with a Typst session I have dozens of tabs open to DuckDuckGo, the Typst documentation, various Typst packages and their documentation, and the forums.

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Open post
Ethan Blanton @elb@social.sdf.org
· 11mo ago
Replying to
@ricci@discuss.systems This is freaking awesome. I took the liberty of posting it here: https://retrocomputingforum.com/t/unix-v4-tape-found-at-the-university-of-utah/5400
Unix V4 tape found at The University of Utah
Retro Computing

Unix V4 tape found at The University of Utah

This toot on the Fediverse describes a fun and historically significant discovery: a magnetic tape containing what may be an installation image of Unix V4 has been found at the University of Utah. The label on the tape says “UNIX Original from Bell Labs V4 (See Manual for format)”. This is particularly exciting because there is no known complete V4 image, although some artifacts (including the complete manual sources) are known to exist. V4 was the first version of Unix with a C kernel (for

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Open post
Ethan Blanton @elb@social.sdf.org
· 2mo ago

How many domains is too many domains? Asking for a friend.

(Also why have they gotten so expensive?!?)

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Open post
Ethan Blanton @elb@social.sdf.org
· 6mo ago

Marchintosh is almost over and I haven't even powered up a classic Mac. :-(

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Open post
Ethan Blanton @elb@social.sdf.org
· 7mo ago
Replying to
@florian@bsd.network That's basically what I said ... stuff like IP and TCP and DNS is lifetime achievement material, and if a company could turn out something like that on demand they'd dominate whatever market they were in.
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago

A new friend, from Summer of '84. They should have a familiar look, for those of us of a certain set of interests.

640K? What about 64K? Do more with less, right?

#Retrocomputing #IBMPC

social.sdf.org
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@lindsey I was just talking about this kind of thing with @akhirsch at lunch yesterday. I'm super proud of your student for noticing that, what I was specifically musing on is that I find it difficult to teach students to find trivial solutions even when prompted. (I think this is similar to finding corner cases and limits; it requires an inversion of thinking that takes some practice!)
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Open post
Ethan Blanton @elb@social.sdf.org
· 7mo ago
Replying to
@autiomaa@mementomori.social So true. It's been years since I was involved with the IETF/etc, but so many just really competent and knowledgeable people were happy to give me the time of day when I was a snot-nosed twenty-year-old. Sally Floyd (RIP) and Van Jacobson happy to discourse on congestion control, Randy Bush and Geoff Huston on routing and autonomous systems, etc. I really believe the Internet we have today (whether we're doing the right things with it or not) is because they shared experience. @florian@bsd.network
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Open post
Ethan Blanton @elb@social.sdf.org
· 22mo ago

We're losing computing history at an incredible rate, but there are people doing just amazing work out there collecting not only information about the technologies, but also the people and processes that brought them to be. If you're interested in that kind of thing but not sure where to start, let me recommend some sites that have some great stories (in no particular order):

https://folklore.org/0-index.html
https://multicians.org/
http://www.tuhs.org/

There are others, of course! #ComputerHistory

folklore.org
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago

https://www.instructure.com/incident_update

"The data fields involved include information like usernames, email addresses, course names, enrollment information and messages. Core learning data (course content, submissions, credentials) was not compromised."
"Canvas by Instructure is fully operational and remains safe to use. Core learning data is not compromised."

So, basically, personal information and federally protected data was stolen, but it's safe because nobody's slides were compromised?
#HigherEd #BigTech

Security Incident Update & FAQs
Instructure

Security Incident Update & FAQs

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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@davefischer@hachyderm.io I wish I were closer, I hope you find a good home for them. I have neither Sun nor SGI glass, and a 13W3 to VGA adapter just isn't the same. ;-) It is _lighter_, of course ...
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Open post
Ethan Blanton @elb@social.sdf.org
· 6mo ago
Replying to
@millihertz And why do paste and join have different options for selecting delimiters? I've been doing this stuff for 30+ years and I have to check some of these things all the time.
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Open post
Ethan Blanton @elb@social.sdf.org
· 7mo ago
Replying to
@migratory@jorts.horse I actually gave that speech on Monday, I think; distributed systems are like C, you PROBABLY don't want to use it. Most systems will run just fine on a core 2 duo you found in a closet UNTIL you try to distribute them. ;-)
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@ricci Does your contract, as an academic, allow submission before the deadline?
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Open post
Ethan Blanton @elb@social.sdf.org
· 7mo ago
Replying to
@sean@scoat.es We talked about that, too! @evan@cosocial.ca
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Open post
Ethan Blanton @elb@social.sdf.org
· 6mo ago
Replying to
@hazelton@sparkgap.marsfreeradio.org For many years I carried a 6" metal scale in my pocket (marked down to 1/64ths, so not as fine as .1mm!; inches are the customary measurement here). I stopped because it kept cutting holes in my pockets, but it was indeed convenient to have. It is now sitting beside me on my desk, and I have various inch and metric scales at my other desks. I always pick them up when I find them at flea markets/estate sales/etc.!
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Open post
Ethan Blanton @elb@social.sdf.org
· 6mo ago
Replying to
@aburka@hachyderm.io "Classic Mac" in this case is a technical term used to refer to Macs of the Motorola 68k architecture, which were discontinued in the mid to late 1990s (in favor of PowerPC). 2008 is probably early x86 Mac, yet another architectural change later. It's still a cool machine, though, and you should definitely do something fun with it!
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Open post
Ethan Blanton @elb@social.sdf.org
· 4mo ago

https://blog.himanshuanand.com/2026/05/the-90-day-disclosure-policy-is-dead/

I think this is a use case for LLMs and coding assistants that I can actually see and get behind. The fact that they're exploitative and unsustainably expensive to generate/maintain is still a problem that I don't have an answer for, but running bug and vulnerability checks against your _own codebase_ seems like just a good idea, in 2026. I'm still not convinced for routine code development.

The 90 day disclosure policy is dead
Himanshu Anand :: Security & Other Notes

The 90 day disclosure policy is dead

TLDR The 90 day responsible disclosure window was built for a world where bug finders were rare and exploit development was slow. That world is gone. LLMs have compressed both timelines to near-zero. I have seen it first hand, and so has everyone else paying attention. This post lays out why the old model is broken, with real stories, and makes one ask to the industry: treat every critical security issue as P0 and patch it immediately.

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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@lindsey mutt
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@amoroso@oldbytes.space Agreed!
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@gloriouscow@oldbytes.space @thalia@discuss.systems yeah but if it's actual RS-232 then you are obligated by a law as old as time to use at least three different adapters in between at least two lengths of cable.
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@brian@awesome.garden Did it keep working after that? Did the foul-smelling smoke smell kind of fishy? Is there a burnt plastic box (possibly with little leaves of paper/plastic/metal fluffing out of it, possibly not) immediately behind the power entrance plug, there? A lot of 1970s devices have a kind of power line filter capacitor called a RIFA, and they fail safely but stinkily. When they fail it normally doesn't inhibit usage of the device. If you web search "RIFA capacitor" you'll see photos.
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Open post
Ethan Blanton @elb@social.sdf.org
· 6mo ago
Replying to
@mwichary There is one of these at the Info Age Science Museum in Wall, NJ (where VCF East is held) attached to a ... Nova, I think.
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Open post
Ethan Blanton @elb@social.sdf.org
· 6mo ago
Replying to
@rayk @millihertz In particular, in the V5/V6/V7 time frame, the Unix from the CSRG (which is the one with all the Vs) and Programmer's Workbench (PWB) Unix were merged, and there were a lot of differences there. But in general, in the early days, these programs were just written by somebody and lived in their ~ until someone said "man that's really useful, let's give it to usr" or whatever. Nonetheless it is painful in 2026.
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Open post
Ethan Blanton @elb@social.sdf.org
· 36mo ago
Replying to
@anthropy@mastodon.derg.nz @lowqualityfacts@mstdn.social I like how all the retrocomputing people took Saturday off to post about cats.
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Ethan Blanton @elb@social.sdf.org
· 8mo ago
Replying to
@vkc@linuxmom.net SO TRUE. $ grep elb aliases | wc -l 168 ... and that's just on one domain. Maybe we can just list entire domains, along with the addresses on each domain that _aren't_ ours?
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Open post
Ethan Blanton @elb@social.sdf.org
· 22mo ago
Replying to
@Infinidoge@meow.social Did you buy it at CVS?
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Open post
Ethan Blanton @elb@social.sdf.org
· 11mo ago
Replying to
@ericwastl@hachyderm.io Thank you for your service, and I look forward to Advent of Code 2025! I teach (among other things) programming at a large state university in the US, and I frequently advocate that students pick old Advent of Code problems to get programming practice. Unlike leetcode or hackerrank or similar, I find that you have done a great job of tailoring them for problem solving, not for memorizing common tricks (although tricks might sometimes help!). You're doing great work.
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@ericr@social.lol
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Ethan Blanton @elb@social.sdf.org
· 4mo ago
Replying to
@david_chisnall@infosec.exchange Oh, oh, I know this one! It's @cwebber@social.coop! She also asks it to explain the Fediverse.
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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@brian@awesome.garden That is unfortunate, indeed. Then I suspect, as a previous poster suggested, that some sticky lube somewhere burned up either a driver component or a motor. There are a lot of capacitors on that board, they're not out of the woods, but those larger-size caps from that era would tend to have low capacitance but not pop and smoke.
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Open post
Ethan Blanton @elb@social.sdf.org
· 2mo ago

JFK is the second worst airport

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Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@gloriouscow@oldbytes.space https://lostbits.net/the-basement/
The Basement
Lost Bits

The Basement

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Open post
Ethan Blanton @elb@social.sdf.org
· 5mo ago
Replying to
@wenge@hachyderm.io I have a plastic bag that says "UltraSPARC iii, probably bad".
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Open post
Ethan Blanton @elb@social.sdf.org
· 7mo ago
Replying to
@geb@mamot.fr @bortzmeyer@mastodon.gougere.fr That's fine; in class, we discussed TLDs, gTLDs, some of the drama behind ISO country codes, what happens when a domain expires or is repossessed, etc.
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