Interface 1 & DivMMC Future Problem

[Crafty88]

Went a bit crazy and bought two interface 1's
Both work fine can access a microdrive.
The only problem I have is if have my DivMMC future connected and the SD card insterted the spectrum does not boot to the Sinclair prompt. The border flashes and get ramdom black and white blocks on the screen.
If eject the SD card and power up the spectrum it powers up as normal.
Spectrum 48k r6

[Alcoholics Anonymous]

Unfortunately the if1 and divmmc are incompatible with each other.

[PeterJ]

This is a useful chart from ByteDelight:



Source:

https://www.bytedelight.com/?page_id=3605

[Crafty88]

Thanks. Explains why it throws a wobbler. The two additional ROM's conflicting with each other.