Sinclair Research

Z80 Opcode Calculator - Apps on Google Play Get your opcodes and mnemonics on the fly.

My Z80 Opcode Calculator app on Google Play was updated yesterday. Undocumented opcodes are now included. Test away!

#z80 #msx #zxspectrum #amstrad

Congrats to the #ZX81 on its 45th birthday! My coding life started on that little machine at a friend's house. We watched WarGames and made a password screen. It was magic. 😍
Never used it again after that, as the Spectrum came into my life. Still have fond memories of that day.

We had a 380z in our school too - the huge scary looking metal black box with a 5.25 floppy disk and mysterious “CP/M”.

Before the ZX81, the ZX80 blazed the trail. Ever used one?

I wrote a Z80 assembler chess game in 1K on Sinclair ZX81 in the 80s. It wasn’t the most sophisticated but played (and allowed) only valid moves. Happy times…

I need to find the link.. some smart person set up an entire tool chain that uses visual studio code.

Blink and you’ll miss it. #TGIF

Sinclair Research would like to remind you that the 16K RAM pack is a precision instrument and should not be breathed near.

I miss this period of seemingly state-of-the-art features appearing a weekly basis. Adding these add-ons to your ZX81 would provide hours of experimentation and playground bragging rights.

Our long nightmare is over.

The ZX81 was my first computer, and it certainly had a massive impact on the 6 year old me.
I am sure I don't need to tell you all, but if you want to see why the ZX81 was so important, you can build a ZX81 compatible kit from basic logic chips.
www.tindie.com/products/tyn...

At least a Fruit Salad.

45 years old today.

Did the ZX81 change your life?

en.wikipedia.org/wiki/ZX81

Hmmmmm. They feel.. impersonal though.

🤣

From one issue of a US mag for the ZX81..

I thought so. But many complained.

No lie.

Fun fact: The ZX Spectrum's rubber keys were originally going to be hard plastic. Sinclair went with rubber to save 2p per unit. That 2p decision gave an entire generation a typing experience they would complain about for the next 40 years.

Trying to find a new 15volt AC power supply for the TS2068. It’s tricky!

I believe it’s 64K in spirit :) probably because of the size of the RAM chips they used.

Yes I’m not sure how it is wired but the internal RAM is always the first to go.

I remember in quite some detail, the nuances of programming the ZX81 in 1981. That’s 45 years ago. I wonder if the kiddies of today will remember the stupid ChatGPT prompts they were using in 2026, in 2071.

The joyous thing about ZX81 BASIC is that the INPUT statement allowed entry of BASIC expressions, eg 10/SIN(77)
What a time to be alive!

Green was the only way. Much better resolution for programming and writing articles for computer magazines!

AVAILABLE NOW: 1K of RAM. That's 1,024 bytes of pure, unbridled possibility. Write a game. Write a calculator. Write half a calculator. The choice is yours.

There’s always the command line.

If you wondered how a #ZX81 could use a 64K RAM pack, this advert lays it out pretty clearly. “With difficulty”.