| AL | = | character |
| AH | = | 00h or extended ASCII code if AL = 00h |
| BL | = | field number |
| CH | = | cursor column |
| CL | = | cursor row |
| DL | = | field type modifier (sixth item in field table entry) |
| DH | = | seventh item in field table entry |
| ES:SI | = | window's handle |
| DS:DI |  |
field table entry for field containing the cursor |
| AH | = | action to take
|