date $77B see below (3 bytes)
time $77E see below (3 bytes)
The 'kernel' routine is called by doing a jump subroutine (JSR) to address $703 with the
desired command in the 6502 Y register and the desired device number previously
stored in the memory location 'device'. For example, with a $10 in device, a value of 100
in the Y-register will cause the current time and date to be placed in the variables 'time'
and 'date'. A 101 will cause the current time to be set to the values contained in the
variables 'time' and 'date'.
kd_gettd 100 get current time and date
kd_settd 101 set time and date