That multi is of the old type. I'm u sure what firmware is there at all. It should come with the newest bootloader. To check this is very simple, take a cps2 firmware for the old type and copy it to the root of the SD card. The file must be called flash.img. if the file gets deleted, that means that the bootloader is good and you can automatically update the microSD cards.
How is the multi behaving at all. Does it boot? Does the LCD work well?
About that GAL, that is a replacement for the PAL, it should work as is, as your B board is a -6 version.
How is the multi behaving at all. Does it boot? Does the LCD work well?
About that GAL, that is a replacement for the PAL, it should work as is, as your B board is a -6 version.