A.4.2 Emulator call encodings
- NTVDM uses C4 C4 (LEA with a register source) followed by one or two
callback identifier bytes.
- DOSBox uses FE 38 (invalid encoding with /7) followed by a callback
identifier word.
- dosemu2 uses HLT and dispatches based on the address of the HLT.
- 8086tiny uses 0F followed by one identifier byte, currently in the
range 00 to 04.