rz ver 3.7

this is a new branch of rz36.  It integrates necessary supports for running OS in interrupt mode and support multi-core s2.

immediate goals
1)  fix recursive call
2)  gencode for * &

5 Feb 2013

change input lex.c to get one line at a time instead of reading the whole file into buffer at once.  Now the input size is not limit to MAXFIN.  

17 Feb 2013

how to activate core 2?

the execution starts with core 1.  it starts normally and runs in single core mode.  the core 2 is activated by core 1 execute "start core 2" (trap 15) instruction. Core 2 starts at the link address stored in M[20].  The compiler prepared this link address by initialise it to point to the function main2().

18 Feb 2013

