On Friday 19 July 2013 15:22:50 Jon Elson did opine: > EBo wrote: > > true. That board design seems to come from the the traditional > > embedded design camp -- little RAM and a decent amount of EPROM. I do > > like some of the peripherals and power though. > > it is an ** 8 ** bit CPU! You will never get a real Linux kernel to run > on that, > although some super-stripped-down kernel might be possible. But, the > whole Propeller idea is really stupid, aimed at people who can't > comprehend a task scheduler, real time OS, or multiprogramming. So, > you put each task on a separate virtual CPU and let it multiplex the > hardware among the tasks. This is just like Intel's hyperthreading X > 8, instead of just X 2. That is great for an OS that does a horrible > job of multitasking (read Windows), > but really not useful at all on an OS that does it well (read Linux). > > <rant off> > > Even though the Propeller's CPU instances each run at 80 MHz, the > overall performance is WAY down, because it is doing 8-bit operations > on 8-bit memory at that speed. I thought the Z-80 was the bee's knees > in 1976, but it is now obsolete by about 30 years! > > Jon
Nah, it was broken even then. I looked at it in 1978 for a project and wound up using the RCA 1802, it was just as fast and actually had a true 16 bit address bus. Writing code for it by looking up the nemonic and using the programmers manual for an assembler to feed a hex monitor was dead straight forward. Again, in 1980, I needed a smart transmitter control in NE CA at a radio station, bought two Microprofessor Z80 based boards. Big mistake. I used them, but the Z80's 8 bit unsigned conditional jumps meant every 256 byte page of ram had to hold a table of long jumps at both upper & lower boundaries of each page. Then Zilog would not replace a patently defective Z-80. I had to buy it myself, $30 IIRC. Zilog sealed their doom with me on that. I must have lost a gallon of mental blood on that. Life is too short for that kind of pain. I wouldn't ever use one again even if they were free, I'd use a moto 6809 or a Hitachi HD6309. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> If I promised you the moon and the stars, would you believe it? -- Alan Parsons Project A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
