A good one from Simon Holdsworth, the author of the JavaScript port of EightyOne (usable online) zx81stuff.org.uk/zx81/jtyone....

"For more information about how to use the ZX81, there is an online version of the ZX81 Basic Programming manual" www.worldofspectrum.org/ZX81BasicPro...

There was at least one correct printer for the Spectrum (and the ZX81 but with an adapter): the Seikosha GP-50S
www.sinclaircollection.site?page_id=530
I printed many loading screen dumps like this one, the most beautiful coming from Ultimate, of course. Many Z80 assembly listings too...

Computer Gamer cover (Feb 1986) #zxspectrum #retrogaming

Here's a rather original ZX81 emulator written in Perl! It was last updated in 2013. Even if you don't use it, it contains interesting PDF reference documents.
github.com/domahony/zx81/
#zx81emu

I was fond of my Programmer's Hex & Time Calculator in the 80s. Hard to press rubber keys, powered with 2 AA batteries. The back reads "Custom manufactured in Japan for Radio Shack". I wonder if it was Casio.

www.reids4fun.com/566/infinite...

m.youtube.com/watch?v=tQwA...

At last, a way to have a continuous hello world on the ZX81. 🙂
It's an interesting walk within the ZX Basic internals by Steven.
Let's make the ZX81 great again! 😊

Could be useful.
I'd like to find the same on Z80.

github.com/TobyLobster/...

I think this could be a big deal in the fight against degrading plastics. There are all kinds of ideas being dreamed up since I told people about this stuff. Can you think of a way it can be used?

@breakintoprogram.co.uk
About www.breakintoprogram.co.uk/computers/in... , do you think you would have had the same protocol issue with a FDI chipset (made for USB) such as www.adafruit.com/product/5446 ?
I have to interface with old hardware like Sun Fire or HP rp/rx and I'd like to avoid trouble.

For the sake of reinventing the wheel and partly about #retrocomputing, what would be the best strategy to draw (single pixel width) an ellipse with a given tilt e.g. a 100*200 bounding rectangle rotated by 15 degrees ? I know how to do it the Bresenham way ... but without any rotation.

@superchartisland.com
Durell's (or Clive Townsend's) Saboteur! Maybe an idea for a (un)charted post.
Even if I never completed the game, I returned frequently to it to enjoy its design and the sound effects - albeit very limited on the ZX Spectrum.
teknamic.com/product/the-...

@superchartisland.com
You were a bit harsh on Bullfrog's Syndicate. I literally spent hours on it.
superchartisland.com/syndicate/

One of the cubes is not in the right place :-)

I'd rather follow Tux' whereabouts than AF1 these days :-)
www.flightaware.com/live/flight/...

Those were the days...