I am studying the T.V systems for different regions for the DVD Recorders I am working on. The regions are Asia Pacific, LATAM, NAFTA and Europe. I found a document explaining about the systems atI came to realize that there are monochrome standards are assigned a letter designation (A-M) in combination with color systems. (NTSC, PAL, SECAM) And the product I am working has tuners for systems described as: PAL B/G, PAL D/K, SECAM L/L', PAL I. At the same time some documents sometimes describe again: B/G, I, L/L', D/K whithout color system designations for the same product. After studying the table provided by wikipedia and the reference documents, I wonder what systems they really are using for the regions APAC, LATAM and Europe. Is there any NTSC B/G or NTSC I ? Aganin it describes for LATAM there are only systems M and N. Can anybody explain to me about it clearly?