INT 61 - PC/TCP kernel v2.05+ - "net_select" - DETECT READINESS OF NETWORK
AH = 0Eh
BX = maximum value of network descriptor for which to return info
DS:DX -> 32-bit (max) array of bit flags for read readiness
ES:DI -> 32-bit (max) array of bit flags for write readiness
Return: CF clear
InstallCheck: test for the signature "TCPTSR" three bytes beyond the start
of the interrupt handler
Range: INT 20 to INT E0, selected by configuration
Notes: bits in the DS:DX buffer are set if the corresponding network
descriptor may be read without blocking; bits in the ES:DI buffer
are set if the corresponding network descriptor may be written
without blocking. This implies that the network descriptor has
opened correctly and the protocol initialized.
SeeAlso: INT 61"FTP Software",INT 61/AH=00h"PC/TCP"