INT 21h |

09h [E]DX instead of DX

0Ah [E]DX instead of DX

0FH – 17H not supported; use corresponding file handle function.

1Ah [E]DX instead of DX

21h – 24h not supported; use corresponding file handle function.

25h [E]DX instead of DX. Protected mode vector will be set.

26h – 29h not supported; use corresponding file handle function.

2Fh [E]BX instead of BX

31h No value is required in DX

35h [E]DX instead of BX. Protected mode vector will be returned.

39h [E]DX instead of DX

3Ah [E]DX instead of DX

3Bh [E]DX instead of DX

3Ch [E]DX instead of DX

3Dh [E]DX instead of DX

3Fh [E]DX instead of DX

40h [E]DX instead of DX

41h [E]DX instead of DX

43h [E]DX instead of DX

44h subfunction 02h, use [E]DX instead

44h subfunction 03h, use [E]DX instead

44h subfunction 04h, use [E]DX instead

44h subfunction 05h, use [E]DX instead

47h [E]SI instead of SI

48h Protected mode memory will be allocated

49h Protected mode memory will be released

4Ah Protected mode memory will be resized

4Bh [E]DX & [E]BX instead of DX & BX

Parameter block offset entries are [d]word

4Eh [E]DX instead of DX

56h [E]DX & [E]DI instead of DX & DI

5Ah [E]DX instead of DX

5Bh [E]DX instead of DX

62h Protected mode selector will be returned

6Ch [E]SI instead of SI