On Wed, 28 Aug 2002, Jon De Schrijder wrote: > I just wanted to say that from time to time I have very good contacts > with the japanese hardware people and Tsujikawa even asked me to join > his project. Too bad I don't have that much time left for MSX and I'm > already writing VHDL all day for my job.
This is very good! Then you should know VHDL much better than me. Your hardware projects are being implemented in FPGA or directly to ASIC? What are your synthesis tools? > About the approach of replacing chips in stead of making a new board: I > don't think you can do it for all MSX chips, since some chips probably > also contain analog logic (the VDP?), and thus can't be rebuilt with an > FPGA only. In fact, PSG outputs are analog, one output per channel. FPGAs outputs are digital. Given that all MSX models just connect the three outputs together for mixing these signals, I created a digital mixer (a 4-to-6 bit adder) and connected the output (6 bits) to a good and old R-2R digital to analog converter. And this is connected in place of the original pin 4 of PSG. Something similar will happen to the VDP. > Regards and success to all hardware people out there ! Thanks! Greetings from Brazil ----------------------------------------------------------- Marco Antonio Simon Dal Poz http://www.lsi.usp.br/~mdalpoz [EMAIL PROTECTED] "old Fords never die, just get better" _______________________________________________ MSX mailing list ([EMAIL PROTECTED]) Info page: http://lists.stack.nl/mailman/listinfo/msx
