DOS/32 Advanced DOS Extender - Programmer's Reference

3.17 - DOS function 40h - Write to File


In: AH = 40h
EBX = file handle
ECX = number of bytes to write (size)
DS:EDX = pointer to buffer to write from (addr)

if successful:
CF clear
EAX = number of bytes written

if failed:
CF set
EAX = DOS error code


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