INT 14 - TelAPI - READ BLOCK                                                    
	AH = 07h
	CX = length of buffer in bytes
	DX = port number
	ES:DI -> buffer for data
Return: AX > 0000h number of characters actually read
	AX = 0000h host has closed connection
	AX < 0000h error code (see #00397)
	CX = ???
Note:	translates CRLF into local EOL if the connection is in ASCII mode,
	  negotiates various Telnet options, and immediately executes several
	  different Telnet action commands
SeeAlso: AH=06h"TelAPI",AH=E0h"TelAPI",AH=E2h"TelAPI"