Extra ROM usage with Multiply

[Alex-Electron]

Is it possible to make an option to force Multiply working with Extra ROM which we can optionally upload in Dandanator? I am testing Dandanator with Belarussian Spectrum "Byte" ("Байт"), it has a customised ROM and some games can not work with it's custom ROM and i am using option for some games to use Extra ROM (I upload in Dandanator instead default test ROM original Spectrum 48k ROM). But I can not make Multiply working (Multiply shows the interface, I can see all the files, I can browse, but can not load), probably, because of custom ROM in "Byte". What do you think about it?

[mad3001]

Wow, I didn't see your post... and it's been nine months (a whole pregnancy). I don't know why I didn't receive any notification about it, or maybe I missed it...
Well, I can only speculate that perhaps Byte ("Байт") uses some kind of NMI or interrupt service to control the process.
Perhaps disassembling the ROM could clear up any doubts.