dnewhous wrote:

Did either version of the MT32 have a MIDI SYNC connection?

Do you mean DIN sync? No MT-32 features such a port.

DIN sync's successor - MIDI beat clock - is a feature of the MIDI specification itself, and is transmitted/received across standard MIDI ports. This is a moot point though, as the MT-32 has no "clockable" functions or functionality, and completely ignores the associated real-time messages. What is prompting the question?

I'm trying to figure out why some games do not work in so called "UART" mode by first investigating what exactly "MPU-401 intelligent mode" is.

I'm not entirely familiar with the associated quirks involved, but I know It's not on the serial output side of the interface as there's no ability for status feedback from the module. I did find some notes which explains some of this.

MPU-401 intelligent (interrupt-driven) mode is not supported on any type of ISA Sound Blaster. If MPU-401 intelligent mode or a MPU-401 IRQ is required, the software will generally not function.

http://home.icequake.net/~nemesis/blog/index. … hp/archives/369

If you want to know more, do some reading in the SoftMPU thread and potentially begin poking BJT for his insights.

I don't give a frak if MPU-401 intelligent mode is supported by a Soundblaster or not. I want to know about Roland hardware.

Well, I told you about Roland hardware. Everything from Roland except the RAP10 runs in normal (intelligent) mode, including all MPU-401 cards, the LAPC-I, and SCC-1 series.

Everything you need to know about "intelligent" mode (normal mode in Roland parlance) is here:

http://ps-2.kev009.com/ohlandl/sound/MPU-401_Tech_Manual.pdf

If the Roland device does not have a "sync" connection and does not respond to the beat clock, how can you possibly consider it "intelligent"? Did the keyboards, Yamaha DX-7, Yamaha DX-21, Roland D-50, Roland SK-50 respond to or initiate a MIDI clock?

Roland's terminology, not ours. I believe the documentation will answer a lot of your questions.

More on this Roland terminology, does a MIDI In and MIDI Out with a MIDI clock constitute a "UART" interface?

Well, MIDI UARTs are just a serial output at 31250 baud.

Well, even after looking at the manual it appears that without sync, you have a UART.
Also, shouldn't the clock be on the MIDI in? In case you are playing a drum machine and a keyboard at the same time and you need to synchronize their timing even if the musicians are a little bit off.
It also appears to be saying that intelligent mode triggers ISRs over the MIDI cable? Sounds like race condition city to me.