Jean-Marc Gillet

Is that all ? We want more !
Now, seriously : it's impressive. I'm sure that Douglas Trumbull would have been delighted, too.

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...

Beautiful

Be sure to post some nice pictures for those of us abroad.

The Seikosha GP-50S 40-column dot matrix printer (1984) for the ZX Spectrum. It is shown here having printed a dump of the Jet Pac loading screen.

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...

The futuristic artwork à la Blade Runner used for the ZX81 manual cover. A night view of a huge building in a blue and black palette, with two spacecrafts atop.

I couldn't resist.

www.alisoneldred.com/john-harris/...

Back cover of Peek, Poke, Byte and RAM for the ZX81 by Stewart & Jones (1982)

Front cover of Peek, Poke, Byte and RAM for the ZX81 by Stewart & Jones (1982)

You're right. A continuation of the ZX81 cover art indeed.
Thanks to Simon Holdsworth' site : www.zx81stuff.org.uk/zx81/book/Pe...

Ligne claire

What ? A true C5, a NeXT cube and a Sun pizza box ? It's the dragon's lair with its treasure, like the cover of the Hobbit book 🙂

I don't live in Britannia but I do know that it's the title of a Blancmange album.

A screenshot of the game Gyroscope - a good Marble Madness clone - showing the downwards path that the small gyroscope has to follow in order to complete the level. Any deviation means a chute and losing a life.

A great game opus by Steve Lamb, Tony Mack, Dave Dew and Mark Alexander for the ZX Spectrum version. Published by Melbourne House in 1985.

Computer Gamer cover (Feb 1986) #zxspectrum #retrogaming

I like that hands-on style too - from what I could read. What did you achieve with meek and moke 🙂 on that 8 KB RAM micro ?

The wonders of AI.
...
It's a joke ! 😉

I like it a lot, actually. Do you get contacted/contracted sometimes by space agencies or the BBC e.g. for such works ?
NB I couldn't read your LinkedIn profile until now (mandatory login). My apologies if it's written clearly there, IDK.

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

Are you aware of the famous Goldberg paper ? docs.oracle.com/cd/E19957-01...

More than amazing. Hat down !

Strange. I always assumed that Steve Vickers had done a neat floating point package for the "new ROM". Choosing Chebyshev series one one hand and losing mantissa digits on the other hand doesn't add up. I understand the use of x**0.5 instead of Newton-Raphson however : lack of ROM space.

I concur. Benj learned magic from Claude the sorcerer.

You're not alone! What a great game it was. Many hours spent... All those little vortons lacking initiative. 😀

The Radio Shack Programmer's Hex & Time Calculator EC-4075 and its plastic pouch.

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.

It reminds me of fr.wikipedia.org/wiki/Yoko_Ts... (comic strip heroine created in 1970)

The first models were imported from Michigan to France but this one of 1983 with a Z80 at 5 MHz (the fastest at that time probably) should be from France. RGB output, so you avoid the SECAM issue.

The colour clash seems respected indeed 😀

1980 ? Or maybe earlier ?

True. D is not so common anymore but it lasts, even the rechargeable type. It's way better than a triplet of LR44 e.g.

Great image. It's the same colour palette as John Harris for the ZX Spectrum manual cover BTW

Cute and well-designed game, batteries not needed.
It would be the joy of my younger kids (5 and 11) !
Bring it over, please? 😉

Cover of Mastering Machine Code on your ZX81 or ZX80 book by Toni Baker showing a black and white sketched image of both.

Let's not forget the Toni Baker book for the ZX80/ZX81

It looks too much like WWII in occupied France.