diff --git a/rtl/os2/tests/heapsize.pas b/rtl/os2/tests/heapsize.pas
new file mode 100644
index 0000000000..3df5e17834
--- /dev/null
+++ b/rtl/os2/tests/heapsize.pas
@@ -0,0 +1,25 @@
+program heapsize;
+
+var a:longint;
+
+procedure writeheapsize;
+
+begin
+    asm
+        movl $0x7f00,%ax
+        xorl %edx,%edx
+        call ___syscall
+        mov %eax,_A
+    end;
+    writeln(a);
+end;
+
+begin
+    writeheapsize;
+    asm
+        movl $0x7f00,%ax
+        movl $327680,%edx
+        call ___syscall
+    end;
+    writeheapsize;
+end.
diff --git a/rtl/os2/tests/mkhello.cmd b/rtl/os2/tests/mkhello.cmd
new file mode 100644
index 0000000000..8d77902ed0
--- /dev/null
+++ b/rtl/os2/tests/mkhello.cmd
@@ -0,0 +1 @@
+ld -o helloos2.exe prt0.o prt1.o helloos2.o sysos2.o dos.a emx.a dosinit.o
diff --git a/rtl/os2/tests/modeinfo.pas b/rtl/os2/tests/modeinfo.pas
new file mode 100644
index 0000000000..0832b6deee
--- /dev/null
+++ b/rtl/os2/tests/modeinfo.pas
@@ -0,0 +1,42 @@
+program modeinfo;
+
+type    viomodeinfo=record
+            cb:word;                         { length of the entire data structure }
+            fbType,                          { bit mask of mode being set }
+            color: byte;                     { number of colors (power of 2) }
+            col,                             { number of text columns }
+            row,                             { number of text rows }
+            hres,                            { horizontal resolution }
+            vres: word;                      { vertical resolution }
+            fmt_ID,                          { attribute format }
+            attrib: byte;                    { number of attributes }
+            buf_addr,
+            buf_length,
+            full_length,
+            partial_length:longint;
+            ext_data_addr:pointer;
+        end;
+        Pviomodeinfo=^viomodeinfo;
+
+function _VioGetMode (var Amodeinfo:viomodeinfo;viohandle:word):word;[C];
+function _VioSetMode (var Amodeinfo:viomodeinfo;viohandle:word):word;[C];
+
+var mode:viomodeinfo;
+
+begin
+    mode.cb:=sizeof(mode);
+    writeln('getmode= ',_viogetmode(mode,0));
+    writeln('cb= ',mode.cb);
+    writeln('fbtype= ',mode.fbtype);
+    writeln('color= ',mode.color);
+    writeln('col= ',mode.col);
+    writeln('row= ',mode.row);
+    writeln('hres= ',mode.hres);
+    writeln('vres= ',mode.vres);
+    writeln('fmt_ID= ',mode.fmt_ID);
+    writeln('attrib= ',mode.attrib);
+    writeln('buf_addr= ',mode.buf_addr);
+    writeln('buf_length= ',mode.buf_length);
+    writeln('full_length= ',mode.full_length);
+    writeln('partial_length= ',mode.partial_length);
+end.
diff --git a/rtl/os2/tests/o2rtlb1.pas b/rtl/os2/tests/o2rtlb1.pas
new file mode 100644
index 0000000000..31411f825f
--- /dev/null
+++ b/rtl/os2/tests/o2rtlb1.pas
@@ -0,0 +1,83 @@
+program testread;
+{uses crt;}
+var
+  cadena,cadena2 : string;
+  number : real;
+begin
+  {clrscr;}
+  cadena2 := 'Previous string';
+  write ('Enter the string ');
+  readln (cadena);
+  writeln ('You entered ',cadena);
+  writeln ('Previous string was ',cadena2);
+  write ('Enter a number ');
+  readln (number);
+  writeln ('Number entered was ',number);
+  readln;
+end.
+
+{(I have retyped now because my computer is not connected to the net, but I
+think that there are no errors).
+
+Now you can do some tests:
+
+1- Compile and run the program as is (that is, using crt). You will find that
+      a) the program does not erase the screen (that is normal because we have
+commented clrscr), but the cursor goes to the first line, thus overwriting the
+screen.
+   b) While the program is expecting the string to be entered, some of the keys
+do not work correctly: Backspace advances some spaces (just like tab), tab key
+does not work and the cursor keys write garbage. (however this is only in the
+screen, because if you have erased a part of the string it will be actually
+erased).
+   c) Once you have press return, the message 'You entered...' appears in the
+same line as the text entered.
+
+2- Uncomment the clrscr call, cokpile and execute. Point a of test 1 will be
+solved (the screen is erased, so nothing is overwritten), but points b and c
+persist.
+
+3- Comment 'uses crt' and 'clrscr'. Now you will not be using crt. Now:
+   a) Point a of test 1 does not appear: the program begins to write in the
+next line, it does not overwrite anything.
+   b) Now all the keys (tab, backspace..) work as expected.
+   c) Now the message 'You entered...' appears in the following line, so point
+c of test 1 is also solved.
+   d) BUT it writes only 'You entered', WITHOUT writing the string cadena (!).
+It writes also 'Previous string was previous string', so the problem is in
+readln and not in writeln.
+
+4- To see if the problem is only in the string vars, uncomment the definition
+of number, and also the three lines at the end that deal with number. Now ld
+gives the following error message:
+
+testread.pp:0 (testread.o): undefined symbol READ_TEXT_INTEGER referenced from
+text segment.
+
+This error happens with 'uses crt' and also without it.
+
+5- Define number as word. Regardless of crt we get the following error from ld:
+
+testread.pp:0 (testread.o): undefined symbol READ_TEXT_WORD referenced from
+text segment.
+
+6- Uncomment 'uses crt' if it was commented, and change the definition of
+number as real. The program will compile, and it will print the number,
+although in the same line as the input.
+
+7- Finally, comment 'uses crt' again. This time it will also compile and link,
+but it gives a runtime error!
+
+Laufzeitfehler 106 bei 66422
+
+This error is shown before printing the number.
+
+I expect that these bug report will be useful to debug the RTL. Tonight I will
+try to work in the blockwrite problem.
+
+Best regards
+
+Ramon
+
+-- 
+}