I recently had a cause to fit more than one expansion to my ZX spectrum at the same time so went on the hunt for some means of doing it. After stumbling across a 6 way backplane on project speccy I downloaded the gerbers, ordered the boards and attempt to get it working!

So join me as we head far deeper down this Sinclair Rabbit hole than I thought possible.

Links
Project Speccy https://projectspeccy.com/
Spectrum schematics https://spectrumforeveryone.com/techn...
Parts https://www.retroleum.co.uk/

Music
‪@Momentvm‬ Cathode Ray Gun    • Momentvm  Cathode Ray Gun  

CRG Links
CRG X (Twitter)   / yt_crg  
CRG Patreon https://www.patreon.com/user?u=13919007
CRG Discord   / discord  

Chapters
00:00 Intro
02:52 Assembly
05:13 Fitting and Voltage
06:17 The problems begin
07:29 Other problems
11:27 Back to the backplane
12:57 Swapping ram and LS157s
14:26 128k ram mod
16:44 Loading problems
19:15 The plan
21:30 Address bus buffer testing
24:12 Fireworks
26:18 Termination
30:39 More loading woes
34:22 One last try
39:53 Conclusion