Implemented DOS INT21 AH=4B (EXEC).
diff --git a/include/task.h b/include/task.h
index 8750a32..cb666eb 100644
--- a/include/task.h
+++ b/include/task.h
@@ -26,7 +26,7 @@
WORD parentPSP; /* 16 Selector of parent PSP */
BYTE fileHandles[20]; /* 18 Open file handles */
HANDLE16 environment; /* 2c Selector of environment */
- WORD reserved2[2];
+ DWORD saveStack; /* 2e SS:SP on last int21 call */
WORD nbFiles; /* 32 Number of file handles */
SEGPTR fileHandlesPtr; /* 34 Pointer to file handle table */
HANDLE16 hFileHandles; /* 38 Handle to fileHandlesPtr */