It turned out that Dezaemon had its (large) SRAM mapped in the wrong way for ages (maybe since the beginning?) and nobody reported earlier (IIRC) that it complained during selftest about a "S-RAM Break Down"
Thanks to PooshhMao's report, I finally got aware of that and I fixed it locally
![[Linked Image from mamedev.emulab.it]](http://mamedev.emulab.it/etabeta/fast/files/0002_1163210529.png)
![[Linked Image from mamedev.emulab.it]](http://mamedev.emulab.it/etabeta/fast/files/0003_572790661.png)
will add it as soon as I understand if the glitches are due to some further mapping error...