It's a common display situation in Forth. Leading zeros aren't display, even when they exist.
On Sat, Sep 19, 2020, 2:24 AM Mark Roth <cablegu...@gmail.com> wrote: > Is there a reason that when using rshift or 2/ the most significant bit > isn't zero padded? lshift and 2* do this correctly. I was trying to > implement a simple back and forth led on a port by starting with a value of > 1 in the the port. Moving from right to left in the port works perfectly > but when moving from left to right using either rshift or 2/ every other > bit is set high so after a couple of back and forths the port is filled > with 1s. > > I can see that the lshift says it is zero padded but the rshift doesn't say > that it is. Is there a reason for this? The 2012 specs seem to say that > rshift is zero padded as well. > http://lars.nocrew.org/forth2012/core/RSHIFT.html > > Perhaps it's just my noob code that is the problem. > > : cylon > > $ff ddra ! 1 porta ! > > begin 40 ms > > 8 0 do porta @ 2* porta ! 40 ms loop > > 8 0 do porta @ 2/ porta ! 40 ms loop > > key? until ; > > > It appears to work correctly in one direction but not the other. > > Thanks, > Mark > > _______________________________________________ > Amforth-devel mailing list for http://amforth.sf.net/ > Amforth-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/amforth-devel > _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
