Bootleg MVS boards

They exist !

They're probably first generation chipset clones as there's always 3 custom chips (which would act as PRO-B0, PRO-C0 and LSPC-A0).

"Gobit" version

 * Vertical board is fixed
 * Custom chips are marked "68C101", "68C202" and "68C303"
 * Socketed Toshiba Z84 Z80 and Moto 68k CPUs
 * Rebranded YM2610 (or clone ?) as ECW08-4
 * 4 ROMs as in legit MVS boards: BIOS, SFIX, M1 ROM, LO
 * Backup RAM seems to be saved by a goldcap



"Goldstar" version

 * DIP format 68k CPU
 * Through-hole 5% resistors video DAC
 * Custom chips are marked "NEN0.4","007","NEN08","NEN09"
 * Socketed legit YM2610
 * 4 ROMs as in legit MVS boards: BIOS, SFIX, M1 ROM, LO
 * Backup RAM seems to be saved by a goldcap