Int 2F Fn CD21  R - Interwave Game Api - Open Game Device                  [s]

   AX = CD21h
   BX = installed program identifier
   ES:DI -> ASCIZ device name
       "MIDISIMPLE"
       "MIDICOMPLEX"
       "DIRECTCODEC"

Return: AL = status
       00h successful
       DX = device handle
       ---MIDISIMPLE and MIDICOMPLEX---
       BX = real-mode interrupt number (see #2746,#2747)
       ---DIRECTCODEC---
       BX = base port
       CL = IRQ
       CH = DMA channel (04h = no DMA)
       SI = size of FIFO in bytes (0000h = use DMA)
       nonzero failed (not supported or already in use)
   AH may be destroyed
Range: AH=CDh-ECh, selected by scanning for an available multiplex number

See Also: AX=CD00h"InterWave",AX=CD01h"InterWave",AX=CD02h"InterWave"

See Also: AX=CD05h"InterWave",AX=CD22h"InterWave",AX=CD80h"InterWave"

(Table 2746)
Call MIDISIMPLE with:
   EAX = function number
       0001h MIDI byte out
       BL = MIDI byte to send
       0002h MIDI string out
       ECX = length of MIDI string in bytes
       ES:EDI -> MIDI string to send (should not include timing info)
   DX = device handle
   INT xxh (as returned by AX=CD21h)

Return: EAX = status
       00000000h if successful
       FFFFFFFFh on error (bad handle)

See Also: #2747,INT 7E/AX=0001h"IWSBSDRV",INT 7E/AX=0002h"IWSBSDRV"

(Table 2747)
Call MIDICOMPLEX with:
   EAX = function number
       ??? (specification is still in development)
   DX = device handle
   INT xxh (as returned by AX=CD21h)

Return: EAX = status
       00000000h if successful
       FFFFFFFFh on error (bad handle)

See Also: #2746