Date: December 19, 2021
A wide-ranging and not entirely about the Timex/Sinclair computer discussion.
Superfo’s current Harlequin PCB listings on Sell My Retro:
https://www.sellmyretro.com/user/profile/superfo
Some Harlequin auctions on eBay:
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=harlequin+spectrum&_sacat=58058&LH_TitleDesc=0&_odkw=harlequin&_osacat=58058
Harlequin kits from Ben at Byte Delight:
https://www.bytedelight.com/?product_cat=harlequin128
https://www.bytedelight.com/?product_cat=harlequin48
The ZX Spectrum ULA book:
Tim Swenson’s ZX Zine: http://swensont.epizy.com/?i=1