Detecting MSX type can be done by reading address #2D from Main BIOS Here is list of available values:

• 0 = MSX 1
• 1 = MSX 2
• 2 = MSX 2+
• 3 = MSX Turbo R

Please note: Detecting MSX type only allows us to deduce the "minimum VDP type". There are MSX1 models with V9938 (SVI-738, Yamaha CX-5M) and few MSX2 with V9958 (Daewoo CPG-120, Sakhr AX-370, Victor HC-95(T)). There are also many MSX2 owners have updated their VDP from V9938 to V9958. There is a detecting method of the VDP type on this page.