Uploaded August 2023 | Updated September 2026, 2 weeks ago

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Building a ZX Spectrum clone Harlequin 128k donated for the Befriending Scheme Charity auction.
This was a great fun project and the results are excellent. A ZX Spectrum that can output RGB, can be any Spectrum from 48k to the Plus 2A. It can also be a ZX81 (and other computers too!)
All using off-the-shelf components and no custom chips! What an incredible feat of engineering, all in the size of a rubber key ZX Spectrum!

With huge thanks to

Fergus Logan for donating the Harlequin kit!
twitter.com/FergusLogan

Lee Smith @leesmithsworkshop for donating the ZX Mechtrum case and keyboard.

Harlequin 128k Github
github.com/DonSuperfo/Superfo-Harlequin-128

SECOND CHANNEL!
youtube.com/@MoreFunMakingIt2

More Fun Website
morefunmakingit.co.uk

My Twitterings can be found here
twitter.com/morefunmakingit

Facebook
facebook.com/MoreFunMakingIt

Mastedon
https://oldbytes.space/@MoreFunMakingIt

Discord Channel
discord.gg/5fmPMzU


00:00 Introduction
02:50 In the Box?
03:33 Another Harlequin?
05:42 The Build
06:35 Montage 1
09:13 Mistake 1
14:11 Montage 2
15:58 Sockets
20:20 Mistake 2
26:31 Capacitors
27:50 Montage 3
33:01 Not A Chip
34:15 Time for Chips
34:44 Montage 4
38:20 The Other bits
42:51 Competition Time!
43:04 Goodbye!