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INT 0x21 - 0x3e - Read Close File or Device Using Handle


reg value descr
AH 0x3e
BX file handle


CF is cleared : success

reg descr
AX number of bytes readed

CF is set: error

reg descr
AX error code (see DOS Error Code)

Notes & Comments

  • if file is opened for update, file time and date stamp as well as file size are updated in the directory
  • handle is freed


back2root/ibm-pc-ms-dos/interrupts/int_21/int_21_3e.txt · Dernière modification : 2024/01/14 18:11 de frater