VolksForth/msdos/timer.fb

\                                                 ks 22 dez 87                                                                  The timer utilizes the memory cell at $46C that is incremented  by an interrupt. A couple of words allow this timer to be       used for time delays.                                                                                                           time-of-day and date are accessed via MS-DOS calls.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             \ BIMomat BIOS Timer                              ks 03 apr 88    Onlyforth \needs Assembler    2 loadfrom asm.scr                                                                                $46C >label Counter                                                                                                           \ 1193180 / 65536 = 18,206 Hz                                                                                                     1 2 +thru  .( Timer geladen) cr                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               \ BIMomat BIOS Timer                              ks 22 dez 87                                                                    Code ticks ( -- n )   D push   D: C mov   A A xor                  A D: mov   Counter #) D mov   C D: mov   Next   end-code                                                                     : timeout? ( ticks -- ticks f )  pause dup ticks - 0< ;                                                                         : till     ( n -- )        BEGIN  timeout? UNTIL  drop ;                                                                        : time     ( n -- time )   ticks + ;                                                                                            : wait     ( n -- )        time till ;                                                                                          : seconds  ( sec -- ticks )  &18206 &1000 */ ;                                                                                  : minutes  ( min -- ticks )  &1092 * ;                        \ MS-DOS time and date                            ks 22 dez 87                                                                    Code date@  ( -- dd mm yy )                                        D push   $2A # A+ mov   $21 int   A A xor   D+ A- xchg          D push   A push   C D mov   &1900 # D sub   Next             end-code                                                                                                                        Code time@  ( -- ss mm hh )                                        D push   $2C # A+ mov   $21 int   D+ D- mov   0 # D+ mov        D push   D+ D- mov   C+ D- xchg   C push   Next              end-code