NMS8220 Discharge RAM memory faster at powercycle.

Even if you could find a hardware fix to reduce this problem, why make a hardware problem out of a silly software issue?

A hex editor (eg. DiskView 2) is your friend... For 'future experiments' there's emulators, Flash carts, and in a pinch you can always edit the "AB" back in (I used to overwrite just the "A" with a 0 byte, makes it easy to find that location in a .bin loader if necessary later).

Lol!

for solving this problem in past i find many ROMS of games with 42 41 "BA" at start

Thanks all but i was searching for a hardware solution.

DRAM essentially is an array of tiny capacitors. So it isn't that strange some of that charge keeps hanging on. You might say your DRAM works too well in this case...

If you 'have' to have a hardware fix: how about a modified BIOS ROM that does a destructive RAM search at boot? MSX2+ does this, maybe there's some ROMs for Philips regular MSX2's out there that do the same? And the NMS8220 has some built-in firmware. If that's socketed, should be easy to add-in a ROM that nukes RAM-held "AB" signatures and such.