Started by 133MHz, November 28, 2009, 02:02:16 pm
QuoteI finally got a Hong Kong version Famicom recently. That uses NTSC CPU and PPU chips, but there is an NTSC-to-PAL conversion chip in the power/modulator section. (Nintendo patented the conversion technique used by this, the patent is interesting reading.) That chip converts the colour encoding, but can also halt the PPU in order to get a 50Hz picture. There is a 50/60Hz switch on the back of the console. Strangely, on the old PAL TV I tested the console with, the 60Hz PAL picture is fine but the 50Hz picture appears in black and white.Anyway. The crystal frequency in the Hong Kong Famicom is 21.3125MHz (vs 21.47727 for a normal NTSC Famicom). The reason for the difference is probably so the horizontal scan rate is closer to the 15.625kHz PAL standard. Maybe some PAL TVs were not tolerant of variations???The result is that (in full-speed mode) the Hong Kong Famicom has a frame rate of about 59.5 Hz.The console main board ID is HVC-CPU-NPC-26-01A label on the power/modulator shielding reads HVC-HKG-26The NTSC-to-PAL chip has 20 pins and is marked N NPC26
Quote from: L___E___T on November 29, 2009, 11:16:24 amHow much are we talking minus shipping? I might get one just because my AV famicom buzzes on my PAL TV.
Quote from: L___E___T on December 03, 2009, 11:05:37 amGreat price but the shipping could be killer. I wouldn't get an NTSC to PAL convertor, it's not the NTSC signal it's the machine itself. My other NTSC consoles work fine but thanks for highlighting the idea.If it's around in a week I may come back to you!
Quote from: The Uninvited Gremlin on December 05, 2009, 10:08:43 pmi like the front label on the HK Famicom, also the fact it works on both PAL and NTSC makes it grand to own.I personally would really like to see that.