[Flashforth-devel] Update of ff-tutorial-guide.pdf

[Peter J. <pe...@me...>]

Mike,
I've updated the ff-tutorial-guide.pdf at

http://dropbox.eait.uq.edu.au/e4pjacob/flash-forth/

Fixed a couple of typos, changed to use GtkTerm for the terminal program 
and added an example of reporting voltage measurements from an MCP3422 
ADC hanging off the I2C port.

I needed a scale operator for mixed, signed values so I've put one in 
m-star-slash.txt.  It might be useful for other users of qmath.txt (if 
you don't already have one -- I looked but didn't see).
Regards,
Peter Jacobs


\ m-star-slash.txt
\ Peter J. 2013-10-26

-m-star-slash
marker -m-star-slash

\ Duplicate triple
: 3dup ( n1 n2 n3 -- n1 n2 n3 n1 n2 n3 )
   2 pick 2 pick 2 pick
;

\ Signed scale d1*n1/n2 with intermediate triple result
: m*/ ( d1 n1 n2 -- d2 )
   3dup xor xor >r \ save result sign
   abs >r abs >r dabs r> r> \ now have S:ud1 u1 u2
   um*/ r> ?dnegate
;