Sinclair Research
@sinclairresearch.bsky.social
Customer support for your ZX80, ZX81 and other classic hardware. We’re sorry to tell you that your warranty has expired.
If you can get the keypresses right on your first try to get CIRCLE on a ZX Spectrum you’re probably old enough for anything.
February 10, 2026 at 3:47 PM
If you can get the keypresses right on your first try to get CIRCLE on a ZX Spectrum you’re probably old enough for anything.
Reposted by Sinclair Research
Age verification?
I've still got my Spectrum ZX81, with 16k ram pack and the games on cassette that only occasionally loaded after 20 minutes of waiting
I've still got my Spectrum ZX81, with 16k ram pack and the games on cassette that only occasionally loaded after 20 minutes of waiting
February 10, 2026 at 2:13 PM
Age verification?
I've still got my Spectrum ZX81, with 16k ram pack and the games on cassette that only occasionally loaded after 20 minutes of waiting
I've still got my Spectrum ZX81, with 16k ram pack and the games on cassette that only occasionally loaded after 20 minutes of waiting
Reposted by Sinclair Research
ZX81 KEYBOARD Subroutine—Commentary https://lobste.rs/s/uxkpk1 ##retrocomputing
ZX81 KEYBOARD Subroutine—Commentary
drj11.github.io
February 10, 2026 at 3:20 PM
ZX81 KEYBOARD Subroutine—Commentary https://lobste.rs/s/uxkpk1 ##retrocomputing
Reposted by Sinclair Research
Age verification?
I used to plug a 16K RAMpack into a ZX81 to get my game on.
I used to plug a 16K RAMpack into a ZX81 to get my game on.
Age verification?
I had to restart Windows ME ten times a day!
I had to restart Windows ME ten times a day!
Age verification?
I had to manually configure my SoundBlaster.
I had to manually configure my SoundBlaster.
February 10, 2026 at 3:32 PM
Age verification?
I used to plug a 16K RAMpack into a ZX81 to get my game on.
I used to plug a 16K RAMpack into a ZX81 to get my game on.
Reposted by Sinclair Research
Sinclair Spectrum +2A (Amstrad) (1987)
Untested, Dirty & smashed in the post, but that's my kind of challenge, especially on my current 8-bit kick at the moment
❌Case is broken
❌Tape belt stretched
🤷♂️No idea if it works
❌No PSU
❌No Video Cable
❌No Joystick
LET'S 🫧🪛 IT!🧵👇
Untested, Dirty & smashed in the post, but that's my kind of challenge, especially on my current 8-bit kick at the moment
❌Case is broken
❌Tape belt stretched
🤷♂️No idea if it works
❌No PSU
❌No Video Cable
❌No Joystick
LET'S 🫧🪛 IT!🧵👇
February 6, 2026 at 5:05 PM
Sinclair Spectrum +2A (Amstrad) (1987)
Untested, Dirty & smashed in the post, but that's my kind of challenge, especially on my current 8-bit kick at the moment
❌Case is broken
❌Tape belt stretched
🤷♂️No idea if it works
❌No PSU
❌No Video Cable
❌No Joystick
LET'S 🫧🪛 IT!🧵👇
Untested, Dirty & smashed in the post, but that's my kind of challenge, especially on my current 8-bit kick at the moment
❌Case is broken
❌Tape belt stretched
🤷♂️No idea if it works
❌No PSU
❌No Video Cable
❌No Joystick
LET'S 🫧🪛 IT!🧵👇
I do! My micro professor needs MOAR.
Fancy tricking out your 6502 or MC6400 trainer, Micro-Professor, or Heathkit? Michael Wessel's board is for you.
Michael Wessel's PicoRAM Ultimate Vintage SBC Expansion Doubles Its RAM Emulation to a Generous 4kB
Fancy tricking out your 6502 or MC6400 trainer, Micro-Professor, or Heathkit? Here's the board for you.
www.hackster.io
February 9, 2026 at 5:02 PM
I do! My micro professor needs MOAR.
Reposted by Sinclair Research
36. Skool Daze (Microsphere) - ZX Spectrum
Did anyone actually have an original copy of this game? It blew my mind when I found out that it wasn't just a school simulator and you actually had to DO stuff to win! Not that I could of course - those shields were just too hard to hit.
#SkoolDaze
Did anyone actually have an original copy of this game? It blew my mind when I found out that it wasn't just a school simulator and you actually had to DO stuff to win! Not that I could of course - those shields were just too hard to hit.
#SkoolDaze
February 9, 2026 at 2:33 PM
36. Skool Daze (Microsphere) - ZX Spectrum
Did anyone actually have an original copy of this game? It blew my mind when I found out that it wasn't just a school simulator and you actually had to DO stuff to win! Not that I could of course - those shields were just too hard to hit.
#SkoolDaze
Did anyone actually have an original copy of this game? It blew my mind when I found out that it wasn't just a school simulator and you actually had to DO stuff to win! Not that I could of course - those shields were just too hard to hit.
#SkoolDaze
Reposted by Sinclair Research
Ladies, find yourself a man that looks at you like I look at a ZX80.
February 7, 2026 at 4:13 PM
Ladies, find yourself a man that looks at you like I look at a ZX80.
Reposted by Sinclair Research
Rocket Command - on the ZX Spectrum 48K !! with Commentary
- It’s Defender, but puts me in a kind of Red Dwarf mood 🤔 🕹️
#retrogaming #zxspectrum #gaming #games #njenkin
youtu.be/uTDEEUCqSg0?...
- It’s Defender, but puts me in a kind of Red Dwarf mood 🤔 🕹️
#retrogaming #zxspectrum #gaming #games #njenkin
youtu.be/uTDEEUCqSg0?...
Rocket Command - on the ZX Spectrum 48K !! with Commentary
YouTube video by Njenkin
youtu.be
February 7, 2026 at 10:05 AM
Rocket Command - on the ZX Spectrum 48K !! with Commentary
- It’s Defender, but puts me in a kind of Red Dwarf mood 🤔 🕹️
#retrogaming #zxspectrum #gaming #games #njenkin
youtu.be/uTDEEUCqSg0?...
- It’s Defender, but puts me in a kind of Red Dwarf mood 🤔 🕹️
#retrogaming #zxspectrum #gaming #games #njenkin
youtu.be/uTDEEUCqSg0?...
Reposted by Sinclair Research
Rocket Command
ZX Spectrum 48K
Published by Spectrum Games Ltd in 1983
Designed for 16K. Based on the arcade coin-op, DEFENDER, from Williams Electronics in 1981.
Missing the scanner, but does its stuff. Cost £5.50 though! 🤔🕹️
#retrogaming #zxspectrum #gaming #games #njenkin
ZX Spectrum 48K
Published by Spectrum Games Ltd in 1983
Designed for 16K. Based on the arcade coin-op, DEFENDER, from Williams Electronics in 1981.
Missing the scanner, but does its stuff. Cost £5.50 though! 🤔🕹️
#retrogaming #zxspectrum #gaming #games #njenkin
February 7, 2026 at 10:24 AM
Rocket Command
ZX Spectrum 48K
Published by Spectrum Games Ltd in 1983
Designed for 16K. Based on the arcade coin-op, DEFENDER, from Williams Electronics in 1981.
Missing the scanner, but does its stuff. Cost £5.50 though! 🤔🕹️
#retrogaming #zxspectrum #gaming #games #njenkin
ZX Spectrum 48K
Published by Spectrum Games Ltd in 1983
Designed for 16K. Based on the arcade coin-op, DEFENDER, from Williams Electronics in 1981.
Missing the scanner, but does its stuff. Cost £5.50 though! 🤔🕹️
#retrogaming #zxspectrum #gaming #games #njenkin
Reposted by Sinclair Research
Postie has just been and that's my Saturday morning bog reading sorted!
February 7, 2026 at 11:42 AM
Postie has just been and that's my Saturday morning bog reading sorted!
Reposted by Sinclair Research
Reposted by Sinclair Research
The question I had in mind was: Could you make a real time graphic spectrum thing on a zx81.
Ya know like the bars that move up and down on a cheap hifi.
So an 8bit adc chip that you can sample as often as you can. 3.5mhz z80. 32x24 column B&W display.
Ya know like the bars that move up and down on a cheap hifi.
So an 8bit adc chip that you can sample as often as you can. 3.5mhz z80. 32x24 column B&W display.
February 7, 2026 at 9:00 AM
The question I had in mind was: Could you make a real time graphic spectrum thing on a zx81.
Ya know like the bars that move up and down on a cheap hifi.
So an 8bit adc chip that you can sample as often as you can. 3.5mhz z80. 32x24 column B&W display.
Ya know like the bars that move up and down on a cheap hifi.
So an 8bit adc chip that you can sample as often as you can. 3.5mhz z80. 32x24 column B&W display.
Reposted by Sinclair Research
Every American needs to watch this:
February 5, 2026 at 8:41 PM
Every American needs to watch this:
True or false: Red Dwarf's Holly once dated a ZX81.
February 5, 2026 at 1:48 AM
True or false: Red Dwarf's Holly once dated a ZX81.
Reposted by Sinclair Research
I once again own the first computer I ever owned. Very happy to have this for the collection even though I never loved this thing. In fact, I hated it. I was so envious of my friends with Spectrums.
February 4, 2026 at 12:55 PM
I once again own the first computer I ever owned. Very happy to have this for the collection even though I never loved this thing. In fact, I hated it. I was so envious of my friends with Spectrums.
Reposted by Sinclair Research
... and this one www.timexsinclair.com/computer_med...
Voyage of Peril – Timex/Sinclair Computers
www.timexsinclair.com
February 4, 2026 at 7:35 AM
... and this one www.timexsinclair.com/computer_med...
Reposted by Sinclair Research
I'm looking for programs that need/ can use more than 16k. So far, found www.zx81stuff.org.uk/zx81/tape/Mu...
ZX81 tape Multifile Plus by Gladstone Electronics
See more details for this tape and play it now on the zx81stuff website.
www.zx81stuff.org.uk
February 3, 2026 at 7:01 PM
I'm looking for programs that need/ can use more than 16k. So far, found www.zx81stuff.org.uk/zx81/tape/Mu...
Did you have MORE than 16K for your ZX81? What did you do with it? Or was it just for bragging rights?
February 3, 2026 at 4:04 PM
Did you have MORE than 16K for your ZX81? What did you do with it? Or was it just for bragging rights?
Excellent list of the external keyboards that Spectrum owners could have used when they got tired of the rubbery feel. Although I don't know how that would be possible..
www.misterspectrum.com/keyboards
www.misterspectrum.com/keyboards
Mister Spectrum - Keyboards
www.misterspectrum.com
February 3, 2026 at 4:32 AM
Excellent list of the external keyboards that Spectrum owners could have used when they got tired of the rubbery feel. Although I don't know how that would be possible..
www.misterspectrum.com/keyboards
www.misterspectrum.com/keyboards
Reposted by Sinclair Research
ZX History - February 1982: Your Computer rounds up all the ZX81 RAM packs available - including one that added 128k to the machine! It cost over twice the price of the computer, mind…
READ: (1/2) #zxspectrum #retrogaming
READ: (1/2) #zxspectrum #retrogaming
February 2, 2026 at 8:05 PM
ZX History - February 1982: Your Computer rounds up all the ZX81 RAM packs available - including one that added 128k to the machine! It cost over twice the price of the computer, mind…
READ: (1/2) #zxspectrum #retrogaming
READ: (1/2) #zxspectrum #retrogaming
Reposted by Sinclair Research
A *much* better version of the Timex/Sinclair 1000 manual, thanks to the epic scanning skills of C64Whiz
archive.org/details/TS10...
#RetroComputing
#TimexSinclair
#ZX81 #Sinclair
archive.org/details/TS10...
#RetroComputing
#TimexSinclair
#ZX81 #Sinclair
Timex/Sinclair 1000 User Manual : Steven Vickers; Charles F. Durang : Free Download, Borrow, and Streaming : Internet Archive
This is the user manual for the Timex/Sinclair 1000 home computer. It was a slightly modified version of the Sinclair Research ZX81 with 2048 bytes of RAM...
archive.org
February 2, 2026 at 12:47 AM
A *much* better version of the Timex/Sinclair 1000 manual, thanks to the epic scanning skills of C64Whiz
archive.org/details/TS10...
#RetroComputing
#TimexSinclair
#ZX81 #Sinclair
archive.org/details/TS10...
#RetroComputing
#TimexSinclair
#ZX81 #Sinclair