Int 15 Fn 0B  - Vmix - "sys_sysreq" - System Configuration Manager         [O]

   AH = 0Bh
   STACK:  WORD    caller's UID
       DWORD   pointer to ASCIZ name of requested method
           "abort" abort current send/receive on comm port
           "block" start/end critical section
           "close" terminate interrupt-drive comm I/O
           "open" prepare comm port for interrupt-driven I/O
           "delay" set delay timer and wait
           "hibernate" put process to sleep
           "ints" enable/disable interrupt-driven INT 14h
           "length" get current send/receive buffer offsets
           "kswitch" switch stacks
           "numproc" get number of active processes
           "protocol" set protocol function for comm interrupts
           "relocate" set/reset VMiX flag for relocating to himem
           "status" get current open comm port status
           "wake" awaken a process
           "xport" get comm port polled for logins
       ---if "abort"---
        no additional arguments
       ---if "block"---
        WORD   0000h end, 0001h start
       ---if "close"---
        no additional arguments
       ---if "open"---
        WORD   comm port (00h-03h)
        WORD   BIOS parameter byte (see INT 14/AH=00h), except
           bits 7-5 = 000 for 19200, 001 for 38400, 011 for 115200
       ---if "delay"---
        WORD   time in seconds
       ---if "hibernate"---
        WORD   process ID
       ---if "ints"---
        WORD   0000h if no, 0001h if yes
       ---if "length","numproc","relocate","status","xport"---
        no additional arguments
       ---if "kswitch"---
        DWORD  pointer to new stack
       ---if "protocol"---
        DWORD  pointer to function (must be in low "assign"ed memory
           when in 386 mode)
       ---if "wake"---
        WORD   process ID

Return: DX:AX -> result or 0000h:0000h
       ---if "length"---
        BYTE   receive offset
        BYTE   send offset
       ---if "kswitch"---
        DWORD  old stack pointer
       ---if "numproc"---
        WORD   number of active processes
       ---if "status"---
        current open comm port status
       ---if "xport"---
        current comm port being polled for logins

See Also: AH=05h"VMiX",AH=0Eh"VMiX"