Uploaded April 2020 | Updated September 2026, 2 weeks ago

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In this video I finally get my divMMC Future working with my Sinclair ZX Spectrum+ 48K. There's no fault with the divMMC Future as it works great with my Sinclair ZX Spectrum 128K +2B. It turns out I'm one of the unfortunate one's with a dodgy Z80 inside my Sinclair ZX Spectrum+ 48K that has the crucial missing M1 that is needed for the divMMC Future to work correctly. To fix this problem I have to do a Z80 CPU swap for my Sinclair ZX Spectrum+ 48K and fit it with a donor Z80 taken from a dead SEGA Master System board with a known good Z80 CPU and good M1.

Dave Curran has a great blog post over on the tynemouthsoftware webpage about missing M1 signals on Z80's inside Sinclair ZX Spectrum's, You can read more about it here.

blog.tynemouthsoftware.co.uk/2017/07/z80-m1-signals.html


Here's the video of me repairing and restoring this Sinclair ZX Spectrum+ (Plus) 48K.
youtube.com/watch?v=cE8cCvQOt-k

Here's the video of me repairing and restoring the SEGA Master System.
youtube.com/watch?v=Wuw1GsFLens


#sinclair #spectrum #divmmc