WOW, that was really superfast!

Each time you write a new driver I'm wondering again from where and how you get all these necessary hardware informations
(ports for keys, numbers for leds or lcd digits, mem mapping etc.).
Can you 'read' all this just from looking at a PCB picture, or do you need the debugger in MAME to analyze the ROM code?
Or has the MAME team any special tools for this purpose?

BTW, after all I could now make a working plugin for the Super System IV: I've just created a list of those strange numbers "x.y" for each
of these 28 LCD segments, read all of them in loop and build the 4 digits from the right codes - not as difficult as I thought first.

Regards,
Franz