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Format of MIDI Service structure

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Offset Size Description

00h

4 BYTEs name of the structure ("MIDS")

04h

DWORD structure length

08h

16 WORDs patches loaded table bit field

28h

16 WORDs for future expansion

entry points (details ???)

38h

DWORD device check
11h return available tones
12h return TRUE/FALSE if patch is understood
13h set preference
14h allow/disallow voice stealing
15h get FIFO sizes
16h get DMA, IRQ
17h get IO address
18h get mem address
19h get mem free
80h - ... vendors can add DevChks above 0x80

3Ch

DWORD global reset

40h

DWORD MIDI msg

44h

DWORD poll MIDI

48h

DWORD preload patch

4Ch

DWORD unload patch

50h

DWORD timer tick

54h

DWORD get last error
01h unsupported feature/function
02h unknown patch type (see #00121)
03h all tones are used
04h messages are out of sync
05h an incoming patch was incomplete
06h an incoming patch couldn't be stored
07h had to drop an incoming byte
08h driver is failing a patch download
80h - ... vendors specific errors

58h

DWORD Patch Block free callback

5Ch

DWORD MIDI byte avail. callback

See Also:

#00116,#00124