Product specifications

VT1211 LPC SuperIO and Hardware Monitor
Revision 1.0 January 8, 2002 -34- Register Descriptions – MIDI / Game I/O
Technologies, Inc.
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MIDI I/O Registers
These registers are accessed at I/O port addresses offset from
the MIDI I/O Base address (“Plug and Play” programmable
via LDN 6 Rx61-60). The MIDI port base address register
default value is 0300h so that these registers may normally be
accessed at standard MIDI I/O port addresses 300-301h (but
the base address may be changed via software to relocate
these registers to avoid conflicts with other system I/O
devices).
Offset 00h – MIDI Data In................................................RO
Offset 00h – MIDI Data Out ............................................WO
Offset 01h – MIDI Status (80h) ........................................RO
7 Receive Data Input Buffer Empty
0 Receive buffer of FIFO contains data that can
be read via the MIDI Data In register ....default
1 Receive buffer is in pass-through mode or
FIFO is empty
6 Transmit Data Output Buffer Full
0 Transmit buffer of FIFO can accept data
written to the MIDI Data Out register....default
1 Transmit buffer or FIFO cannot accept data
5-0 Reserved ........................................ always reads 0
Offset 01h – MIDI Command ..........................................WO
Game Port I/O Registers
These registers are accessed at I/O port addresses offset from
the Game Port I/O Base address (“Plug and Play”
programmable via LDN 7 Rx61-60). The game port base
address register default value is 0200h so that these registers
may normally be accessed at standard Game Port I/O port
address 201h (but the base address may be changed via
software to relocate these registers to avoid conflicts with
other system I/O devices).
Offset 01h – Game Port Status......................................... RO
7 Joystick B Button 2 Status
6 Joystick B Button 1 Status
5 Joystick A Button 2 Status
4 Joystick A Button 1 Status
3 Joystick B One-Shot Status for Y-Potentiometer
2 Joystick B One-Shot Status for X-Potentiometer
1 Joystick A One-Shot Status for Y-Potentiometer
0 Joystick A One-Shot Status for X-Potentiometer
Offset 01h – Start One-Shot ............................................ WO
7-0 (Value Written is Ignored)