SX Questions and Answers

Questions:

• spamtdodds at peppertelecom.com asks:

  Parallax notified me that they are discontinuing the SX line effective January, 2009. What is the best replacement for this chip - that is, the easiest one to port the many programs I have written in SX-Basic language??

  James Newton of Massmind replies: Parallax has years of inventory available. Stress about it in a few years.+

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• spamsxcorreo at ciudad.com.ar asks:

  Hi James.
  Is there any way to be unblocked to this site ???????
  If you won't simply answer, NO, and I'll be allways using this Proxy server, just see this 24.232.248.19, OK ?? from this IP everybody could RIP or download or use the some software to download all the site ( like teleport ), and tomorrow change the IP again, if you block it !!!, is that way, that you want ?.
  Unblock me please, or let me know if you want that OK.
  Alberto. 200.122.1.220 (dsl.prima.com.ar) sxcorreo@ciudad.com.ar

  James Newton replies: Calm down. As I have answered MANY times, you are NOT blocked. That ip is not in my blocking list. If it were, you would see a specific message and have a form to unblock. What is happening is some sort of bug in your ISP, or a routing failure in the internet or some sort of bug in my web server.+

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• Hello,
  I know that the SX's internal EEPROM can be read at runtime to retrieve tables and whatnot via the IREAD instruction, but is there a way to write to the internal EEPROM during runtime to store data without the need for an external EEPROM? Also, if I want to store data tables in the SX chip during programming, is the DW directive the best way to do it? Thanks!
  Regards,
  Ryan James Newton replies: In short: No and Yes. It isn't an EEPROM, but rather part of the internal FLASH so it needs a higher voltage to program and the SX chip doesn't have that ability. There's lots of sample code for tables and the different methods of storeing them.+

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• nationsem-yahoo-com asks:

  I have a NRZ-S coded signal without clock(only data lines) from a receiver at 2111360 bps, i want to use a software DPLL to synchronize to the data stream and recover the clock signal, but i have the next issues:

  • the NRZ-S only have level changes(edges) with the "0" and you can expect a lot of "1", without edges in some times. it is possible to use DDS with this signal?
  • my SX osc frequency it has to be some specific one? maybe an 2111360 multiple or how can i determine the addecuate one?

  James Newton recommends " This question should probably be posted to the MIT PICList which also hosts SX discussions. See "Forum"
   

• spammartin.kirsch at online.de asks: " are you still intrested in lost virtual peripherals? i think i have at least the timer and the sine wave generator." + Always! Send them to me Please!

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