Description
ISA bus interface : 19 pins
Pin name
pins I/O Type Size Function
ADB7-0
8
I/O TTL 2mA Data bus
A2-0
3
I TTL
- Address bus
/MPUCS
1
I TTL
- MPU401 chip select
/OPLCS
1
I TTL
- FM/Wavetable/Command/Control chip select
/IOW
1
I TTL
- Write enable
/IOR
1
I TTL
- Read enable
RST
1
I TTL
- Initial clear input
AIRQ
1
O TTL 2mA Interrupt signal ("H" : Interrupt)
ABDIR
1
O TTL 2mA Selection of data transfer direction
(“L” : YMF721ˠHost)
ARDY
1
OD TTL 12mA I/O chann
Features
- ˔ The Wavetable synthesizer of this LSI is able to generate up to 24 types of sounds simultaneously. ˔ Has an interface that makes this LSI compatible with MPU-401 UART mode. ˔ Has an OPL3 (FM synthesizer) for AdLib/SoundBlaster.
YMF721 Datasheet
