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Wow a Twiggy Drive (the proprietary 5.25” drive from the original Lisa) Mac prototype is at auction. Only a handful were made and even fewer in existence... #retrocomputing #apple

an soooo cheap :-)



I can't recall if I saw this before or not but worth sharing again even if I did. How about making your own Cray-1 using an FPGA? #retrocomputing wow.

I'm seeing increasing numbers of uC's implemented entirely in FPGA's, and we've started doing this at work: making VHDL representations of our new designs and trying them out in FPGA prior to the actual silicon.



I know the feeling :) #retrocomputing #humor https://xkcd.com/2221/

Emulation

This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. This means you're free to copy and share these comics (but not to sell them). More details....
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It’s sort of #retrocomputing but at the same time is a brand new 6502 based system somewhat compatible with C64. Interesting!

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Completely different under the hood, but it looks a lot like a project computer I built from parts in 2014....

The Micromite Companion. It's built on the Micromite micro controller and the 8core Parallax Propeller. Programmable in MMBasic.

http://propellerpowered.com/the-micromite-companion/

Wow neat! Yeah different but similar style project. Hats off on the progress!

To be clear..I didn't design the thing. I just built one. I was just struck by how similar they look on the surface and in what they were designed to do.

Here it is running a while back...
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Oddly, www.pagetable.com does not resolve for me. It seems to be a problem with systemd-resolv, because it works fine with dig.



Some of the earliest Unix source code ever was released by @ComputerHistory last week. Cool! #retrocomputing #programming


It's pretty amazing what they could do with 32kb of RAM.




This is a pretty neat #retrocomputing project to let you quickly create some classic computer systems/games on a Pi

This is extreme retrogaming... 😆



A fully restored Mac Portable prototype. #retrocomputing #apple

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Holy crap this video looks like a cool tour of #retrocomputing goodness through the Ultima series. I only played Ultima IV in any detail but the nostalgia effect is what made me decide to support @6502Workshop



I remember using this on the Library Macs at my university and then again years later when I went back too Mac in the Mac Cube era. Cool history #retrocomputing



Lightly used Vostok memory core for sale apparently... #history #space #retrocomputing

I always wonder how someone gets his hands on something like that. And why they sell it!

I have no idea if this is authentic or not.

What do you think, @EdS ?
@Ed S

Core memory from Vostok? Late 1950s? I've no idea if it's genuine! But it looks as if it has been crudely removed so would be a huge project to try to make use of it. (It's certainly a core memory though, and it's pretty old, that much is obvious.)

@sohkamyung @hankg

That said, even Soyuz didn't have an onboard computer initially, so if this was so old, it was not intended for space but for ground equipment.

The Soviets liked automation, but you can do a lot with clockwork and mechanisms, and they did.

http://web.mit.edu/slava/space/introduction.htm

@sohkamyung @hankg

That's a fascinating site on Soviet space computing. Thanks! :-)

@hankg



I thought the computers at my high school were old! LOL Seriously though awesome they are helping to keep alive Olivetti's first mainframe (1959) #retrocomputing

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Awesome, I heard about the Olivetti before but did not know it's still running



As someone that likes #retrocomputing and digital archaeology this sounds like a neat idea since so many of the old ones are sort of living time capsules.



Really neat tour of creation of UNIX pipes and how that eureka moment marks the tipping point that led to everyone thinking about the "UNIX philosophy" #history #retrocomputing #unix

FTA: "...He didn’t do exactly what I had proposed for the pipe system call; he invented a slightly better one..."

That right there sums up what excellent teams do.

@Richard Healy Amen to that! I thought the exact some thing when I read it!

Once I started getting the idea of functional programming, I came upon an article that I thought was fascinating about how pipes implement a call structure that's very similar to what you use in FP, except you have to think of it in postfix terms, rather than prefix terms: Rather than data flowing from right to left, it flows from left to right, with the output of the command from the left becoming the input to the command on its right.

I've tried looking for the article, because the idea of integrating a language into an operating system context (á la Smalltalk) intrigued me, and I've wanted to tell people who are interested in FP or Linux about it, but I've been unable to find it again. :(



Probably relevant to @Karl Auerbach at least.

@smellsofbikes@pluspora.com - Is there still a running one, perhaps at the converted MacDonalds at NASA Ames? (You know about the converted Micky-D where they collect old gear and try to recover lost data?) Anyway, I had the good fortune to work with one of the people who used that computer in real life.

The team Ken Shirriff works with restored one that never flew. Below is a link to his write up of getting a Bitcoin mining hash algorithm working on it just to say they did. They have several virtual ones so people can experiment with it on their own without an actual physical article. It's pretty impressive amount of computer archeology and restoration. http://www.righto.com/2019/07/bitcoin-mining-on-apollo-guidance.html



Use the Apollo computer to mine bitcoin? Technically yes but at 1 hash every 10 seconds, no. Fascinating coverage of how to develop for it though! #retrocomputing #space

The conclusion nicely puts the power of the AGC into its period context. Not a bad machine for its day given that they required it to be small light and rad-hardened.

@Stephen Gunnell Yeah as they said it was relatively underpowered at 40K add operations per second compared to other computers of the day but other computers of the day were also far more massive. It's pretty amazing how well it performed against microcomputers 10-15 years later. I found this article on benchmarks from 1977. Looking at the integer add test Microsoft's BASIC took 10 seconds to do 1000 additions. At 40 KIPS the AGC would have done it in 0.0125 seconds. If we say that the comparison took up as much time as the addition and the BASIC interpreter is 10x slower than the same routine written in assembly language then we'd still be looking at the AGC being 10x faster. This makes me want to rerun these benchmarks and write them in 6502 Assembly as a comparison lol.



I have seen reports on the nature of the errors (basically computer was asked to compute more than it had capacity for) but not the why or the fail-over modes if the condition persisted. Great article #space #retrocomputing

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