GeorgeSpinner
Grand Master
What MVS are you using?Well, the solution seems now easy enough. J9 in PROGTOP is not the one, it shall be J10.
I confirm this in case it's useful to someone.
I used 27c800 por P1.
The cart is working fine (except that no music obviously because I have pending soldering the V roms)
Do you happen to have an mv1b? I'm curious why my carts just don't work on multiple mv1b.