Program Segment Prefix
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Range Size of Area Description
00H - 01H 02H (2) INT 20H
02H - 03H 02H (2) Segment of first address after end of block
04H - 04H 01H (1) Reserved
05H - 09H 05H (5) Opcode for far call to DOS function dispatcher
0AH - 0DH 04H (4) Saved contents of terminate routine vector
0EH - 11H 04H (4) Saved contents of CTRL+BREAK vector
12H - 15H 04H (4) Saved contents of error routine vector
16H - 2BH 14H (22) Reserved
2CH - 2DH 02H (2) Segment address of environment
2EH - 5BH 28H (40) Reserved
5CH - 6BH 10H (16) First command-line argument
6CH - 7FH 10H (16) Second command-line argument
80H - FFH 80H (128) Command line and/or Disk Transfer Area (DTA)
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