solved...

chdman copy -ip old.chd -i old.dif -o new.chd

I'd like to create alternate HDD CHDs like Win95b, Win95c (German), etc..
Is there a way to use chdman to combine a Win95.chd + Win95.dif to get a new CHD?

update Sega Model2

https://drive.google.com/drive/folders/ ... VyklRIRqnL

Bob Zed - MAME 285 - What's new https://www.youtube.com/watch?v=46V7ug1pxIY Ashura-X's MAME™ BUILDS! Hey there! Well mameworld is down or maybe dead so I dont know where to up the new builds :/ first I'd like to thank you for the years providing us with nightly builds of mame. It seems most of the p...