Program timertest;

 const timer = 34; {timer unit #}
       Bell = 0; {bell routine #}
       Create = 1; {Create routine #}
       Delete = 2; {delete rtn #}
       Disable = 3; {disable rtn #}
       Enable = 4;  {enable rtn #}
       ONESHOT = 2; {continuous/1shot mode flag - 1 SHOT}
       SKIP1ST = 4; {skip first call flag TRUE}
       ok = FALSE;

 type byte = -128..127;
      bytes = array[0..9999] of byte;
      proutine = ^bytes;
      tblID = integer;
      PBlockCre8 = record
                    case INTEGER of
                      0  : (BLAH : record
                              address : proutine;
                              count : integer;
                              flags : integer;
                              tableID : tblID;
                            end);
                      1  : (tableID : tblID);
                      2  : (BellBlock : record
                                  freq : integer;
                                  speaker : byte;
                                  fill : byte;
                                  duration : integer;
                            end);
                   end;

  var ParameterBlockCre8 : PBlockCre8;
      RestParameterBlock : PBlockCre8;
      ForBell : PBlockCre8;
      i,j,a,q : integer;
      answer : string[80];

 procedure DoNada; external;

 procedure Wait; external;

 procedure Clear; external;

 function Test : boolean; external;

 procedure Hello;
   begin
    if q<>0 then begin
      writeln('Hello there!!!!  ',q);
      q := q+1;
    end;
   end;

 BEGIN
 write('Want timer table test? (y/n)  '); readln(answer);
 if(answer[1]='y')or(answer[1]='Y') then begin
   {call timer driver to create an entry}
   ParameterBlockCre8.BLAH.address := @DoNada;
   ParameterBlockCre8.BLAH.count := 1; {call every 50 milliseconds}
   ParameterBlockCre8.BLAH.flags := 0; {do a continuous entry}
   ParameterBlockCre8.BLAH.tableID := $00FF; {give value to make sure correct}
   writeln('address of ParameterBlockCre8 = ',ord4(@ParameterBlockCre8));
   with ParameterBlockCre8.BLAH do begin
     write('address = ',ord4(address),'  count = ',count);
     writeln('  flags = ',flags,'   tableID = ',tableID);
   end;
   UnitStatus(timer,ParameterBlockCre8,Create);
   writeln(' tableID = ',ParameterBlockCre8.BLAH.tableID);
   RestParameterBlock.tableID := ParameterBlockCre8.BLAH.tableID;

   Clear;
   for i := 1 to 5 do begin
     Wait;
     writeln('Flag set ',i,' times');
   end;

   UnitStatus(timer,RestParameterBlock,Disable);

   Clear;  {in case interrupt during Disable operation}
   for i:= 1 to MAXINT do
     for j := 1 to 10 do;
   writeln('Waited ',ord4(MAXINT)*10,' iterations');
   if Test then writeln('After Disable flag set')
           else writeln('After Disable flag clear');

   UnitStatus(timer,RestParameterBlock,Enable);

   for i := 1 to 5 do begin     {flag should be clear from before Enable}
     Wait;
     writeln('After Enable, Flag set ',i,' times');
   end;

   UnitStatus(timer,RestParameterBlock,Delete);

   Clear;  {in case interrupt during Delete operation}
   for i:= 1 to MAXINT do;
   for j := 1 to 10 do;
   writeln('Waited ',ord4(MAXINT)*10,' iterations');
   if Test then writeln('After Delete flag set')
           else writeln('After Delete flag clear');

   {do timer table test with Pascal program}
     q := 0;   {make sure Hello doesn't write until ready}
     ParameterBlockCre8.BLAH.address := @Hello;
     ParameterBlockCre8.BLAH.count := 10; {call every 500 milliseconds}
     ParameterBlockCre8.BLAH.flags := 0; {do a continuous entry}
     ParameterBlockCre8.BLAH.tableID := $00FF; {give value to make sure correct}
     writeln('address of ParameterBlockCre8 = ',ord4(@ParameterBlockCre8));
      with ParameterBlockCre8.BLAH do begin
       write('address = ',ord4(address),'  count = ',count);
       writeln('  flags = ',flags,'   tableID = ',tableID);
     end;
     UnitStatus(timer,ParameterBlockCre8,Create);
     writeln(' tableID = ',ParameterBlockCre8.BLAH.tableID);
     RestParameterBlock.tableID := ParameterBlockCre8.BLAH.tableID;

     q := 1; {allow Hello to start}
     a := 2; {wait till q=a}
     for i:=1 to 10 do begin
      while (q<a) do;   {wait for change}
      a := a+1;
     end;
     q := 0;{turn off Hello}
     UnitStatus(timer,RestParameterBlock,Delete);

 end;{timer table test}

write('Want Bell test? (y/n)  '); readln(answer);
if(answer[1]='y')or(answer[1]='Y') then begin
 repeat
   {make a bell sound}
   with ForBell.BellBlock do begin
     speaker := $55;
     fill := 0;
     duration := 10; {1/2 second}
     writeln( 'enter 0 to get defaults' );
     write('Enter speaker (a single byte) :  '); readln(a);
     if a<>0 then speaker := a;
     write('Enter duration in 50 millisecond ticks :  '); readln(a);
     if a<>0 then duration := a;
     freq := 1000;  {defaults}
     write('Enter frequency :  '); readln(a);
     if a<>0 then freq := a;
     write('Enter number of times : ');readln(a);
   end;

   for i:=1 to a do
    with ForBell.BellBlock do begin
      write('freq = ',freq,'   spkr = ',speaker);
      writeln('dur. = ',duration);
      freq := freq + 1;
      UnitStatus(timer,ForBell,Bell);
    end;
  write('Done? (y/n)  '); readln(answer);
 until ((answer[1]='y')or(answer[1]='Y'));
end;
END.