PORTIBM PC Portable (uses same BIOS as XT) 0240-024F - Gravis Ultra Sound by Advanced Gravis
Range:	The I/O address range is dipswitch selectable from:
	   0200-020F and 0300-030F
	   0210-021F and 0310-031F
	   0220-022F and 0320-032F
	   0230-023F and 0330-033F
	   0240-024F and 0340-034F
	   0250-025F and 0350-035F
	   0260-026F and 0360-036F
	   0270-027F and 0370-037F
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0340h-034Fh,PORTIBM PC Portable (uses same BIOS as XT) 0746h

0240  -W  Mix Control register (see #P0545)
0241  R-  Read Data
0241  -W  Trigger Timer
0246  R-  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. Status Register (see #P0546)
0248  RW  Timer Control Reg
	  Same as ADLIB Board (see PORTIBM PC Portable (uses same BIOS as XT) 0200h)
0249  -W  Timer Data (see #P0547)
024B  -W  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. Control Register (0240 bit 6 = 1) (see #P0548)
024B  -W  DMAsee Direct Memory Access Control Register (0240 bit 6 = 0) (see #P0549)
024F  RW  Register Controls (rev 3.4+)


Bitfields for Gravis Ultra Sound mix control register:
Bit(s)	Description	(Table P0545)
 6	   Control Register Select (see 024B)
 5	   Enable MIDI(Musical Instrument Digital Interface) A standardized interface for controlling musical instruments with a computer. Loopback
 4	   Combine GF1 IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. with MIDI(Musical Instrument Digital Interface) A standardized interface for controlling musical instruments with a computer. IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 3	   Enable Latches
 2	   Enable MIC IN
 1	   Disable LINE OUT
 0	   Disable LINE IN
SeeAlso: #P0546


Bitfields for Gravis Ultra Sound IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. status register:
Bit(s)	Description	(Table P0546)
 7	   DMAsee Direct Memory Access TC IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 6	   Volume Ramp IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 5	   WaveTable IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 3	   Timer 2 IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 2	   Timer 1 IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 1	   MIDI(Musical Instrument Digital Interface) A standardized interface for controlling musical instruments with a computer. Receive IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 0	   MIDI(Musical Instrument Digital Interface) A standardized interface for controlling musical instruments with a computer. Transmit IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
SeeAlso: #P0545,#P0548,#P0549


Bitfields for Gravis Ultra Sound timer data:
Bit(s)	Description	(Table P0547)
 7	   Reset Timr IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 6	   Mask Timer 1
 5	   Mask Timer 2
 1	   Timer 2 Start
 0	   Timer 1 Start
SeeAlso: #P0546,#P0548


Bitfields for Gravis Ultra Sound IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. control register:
Bit(s)	Description	(Table P0548)
 6	Combine Both IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
 5-3	MIDI(Musical Instrument Digital Interface) A standardized interface for controlling musical instruments with a computer. IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. Selector
	000  No IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
	001  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 2
	010  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 5
	011  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 3
	100  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 7
	101  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 11
	110  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 12
	111  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 15
 2-0	GF1 IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. Selector
	000  No IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated.
	001  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 2
	010  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 5
	011  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 3
	100  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 7
	101  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 11
	110  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 12
	111  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 15
SeeAlso: #P0546,#P0549


Bitfields for Gravis Ultra Sound DMAsee Direct Memory Access Control Register:
Bit(s)	Description	(Table P0549)
 6	Combine Both DMAsee Direct Memory Access
 5-3	DMAsee Direct Memory Access Select Register 2
	000  No DMAsee Direct Memory Access
	001  DMAsee Direct Memory Access 1
	010  DMAsee Direct Memory Access 3
	011  DMAsee Direct Memory Access 5
	100  DMAsee Direct Memory Access 6
	101  DMAsee Direct Memory Access 7
 2-0	DMAsee Direct Memory Access Select Register 1
	000  No DMAsee Direct Memory Access
	001  DMAsee Direct Memory Access 1
	010  DMAsee Direct Memory Access 3
	011  DMAsee Direct Memory Access 5
	100  DMAsee Direct Memory Access 6
	101  DMAsee Direct Memory Access 7
SeeAlso: #P0546,#P0548,#P0591