Op vrijdag 25 juli 2003 19:40, schreef JP Grobler: > Hi > > I removed pins 4,21, 27 from the socket > The colour problem remains > Hi,
I have checked the datasheet of the NMS8250, and it show that the NMS8250 computer has it's own PAL encoding unit. It does not use the composite output of the VDP. Only following four signals are used: csync (is the composite sync signal; hsync and vsync are combined) red green blue The four signals go directly to the scart (although through a small amplifier circuit) and they go to the pal encoder. The output signal of the pal encoder goes to the composite video plug and to the RF modulator (for the antenna signal). Both v9938 and v9958 have the four above mentioned signals. So you would expect them to be the same. However, I have done some search on the internet (via google) and found that the exact timing of hsync (the horizontal synchronization) slightly differs between pal and ntsc. I know (from the v9938 databook) that the v9938 comes in three versions. I have always wondered about the difference. I suspect now that at least one of those versions uses the pal hsync timing and that at least one of the others will use the ntsc hsync timing. In which case it is plausible that the nms8250 (and also other models for the dutch market) will contain the version with the pal hsync timing. My suspicion is now that the pal encoder in the nms8250 will get confused by the csync signal of the v9958, since that one will contain the ntsc hsync timing. This could explain the color loss on the composite signal. Is there any ntsc/pal/video specialist who can confirm the above theory? Because I'm not totally sure. Kind regards, Alex Wulms _______________________________________________ MSX mailing list ([EMAIL PROTECTED]) Info page: http://lists.stack.nl/mailman/listinfo/msx
