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First post, by thierry

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Hi people!

its possible to connect directly to com1 the MT32 use with SoftMPU to play games Sierra? or if there is some kind of special cable .. thanks

Reply 1 of 6, by jesolo

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Refer to the following topic Video demo of SoftMPU's new serial output feature
You can also go the website and refer to the documentation: http://bjt42.github.io/softmpu/

However, I'm not sure whether you can actually use this feature with an MT-32, due to the 5-pin MIDI DIN interface.

Reply 2 of 6, by Cloudschatze

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jesolo wrote:

However, I'm not sure whether you can actually use this feature with an MT-32, due to the 5-pin MIDI DIN interface.

You can, certainly, but it requires the use of a go-between to perform the 38400-baud serial -> 31250-baud MIDI conversion. All serial-connectable MIDI modules perform this conversion internally, and any such model with a MIDI OUT port can be used to facilitate playback from a connected MT-32, including members of Roland's Sound Canvas family, Yamaha's TG and MU tone generators, and several Korg units. Presumably, something like the port-powered Midiman Portman PC/S could also be used, for an even simpler setup.

Here's a video in which I demonstrate MT-32 playback using SoftMPU's serial output functionality, albeit, through outrageously complex means:
https://www.youtube.com/watch?v=hOaxgtu7Gfc

Reply 3 of 6, by thierry

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Thanks jesolo , i was seeing that there is no upgrade post, I will ask what's new

Cloudschatze wrote:
You can, certainly, but it requires the use of a go-between to perform the 38400-baud serial -> 31250-baud MIDI conversion. All […]
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jesolo wrote:

However, I'm not sure whether you can actually use this feature with an MT-32, due to the 5-pin MIDI DIN interface.

You can, certainly, but it requires the use of a go-between to perform the 38400-baud serial -> 31250-baud MIDI conversion. All serial-connectable MIDI modules perform this conversion internally, and any such model with a MIDI OUT port can be used to facilitate playback from a connected MT-32, including members of Roland's Sound Canvas family, Yamaha's TG and MU tone generators, and several Korg units. Presumably, something like the port-powered Midiman Portman PC/S could also be used, for an even simpler setup.

Here's a video in which I demonstrate MT-32 playback using SoftMPU's serial output functionality, albeit, through outrageously complex means:
https://www.youtube.com/watch?v=hOaxgtu7Gfc

Thanks Cloudschatze , then to use the SoftMPU is just a matter of having the Yamaha TG100 - Module only ? or i need to have connected the Yamaha TG100 - Modulo Midi and the MT32? Thanks in advance

Reply 4 of 6, by Cloudschatze

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thierry wrote:

Thanks Cloudschatze , then to use the SoftMPU is just a matter of having the Yamaha TG100 - Module only ? or i need to have connected the Yamaha TG100 - Modulo Midi and the MT32? Thanks in advance

DE-9 serial (COM1/2) -> TG100 TO HOST (PC-2 setting)
TG100 MIDI OUT -> MT-32 MIDI IN

Hosa manufacturers a fairly inexpensive 8-pin mini-DIN to DE-9 cable:
http://hosatech.com/product/dbk-100/

Compared to some of the later modules, the TG100 is pretty basic when used as a serial MIDI interface. Lacking routing options, the serial data arriving at its TO HOST port is simultaneously sent to both the internal tone generator and retransmitted through the MIDI OUT. This just means that you'll want to turn down the volume on the TG100 (or leave it's audio outputs unplugged, or send SysEx to disable RX channel reception for each of the 16 parts, etc.) when desiring only MT-32 playback.

Reply 5 of 6, by Bondi

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Do you, guys, think I can make a 8-pin mini-DIN to DE-9 cable, like above, myself? Are there any electronic components inside, or it's just directly connected? There is the official pinout of this cable

hosa dbk-130.jpg
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HOSA DBK-103
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It's a piece of cake, unless it has anything else except wires inside.

EDIT: Here is complete manual. More details on second page. No mention of any additional components...

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Reply 6 of 6, by Jo22

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Bondi wrote on 2020-11-04, 10:06:
Do you, guys, think I can make a 8-pin mini-DIN to DE-9 cable, like above, myself? Are there any electronic components inside, o […]
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Do you, guys, think I can make a 8-pin mini-DIN to DE-9 cable, like above, myself? Are there any electronic components inside, or it's just directly connected? There is the official pinout of this cable
hosa dbk-130.jpg
It's a piece of cake, unless it has anything else except wires inside.

EDIT: Here is complete manual. More details on second page. No mention of any additional components...
DBK-100_Pinout.pdf

Generally spraking, I would never use MIDI without the use of an opto-coupler. The RS232 uses +12v/-12v sigalling, whereas the traditional MIDI port uses a current-loop interface. The waveblaster header on soundcards is another beast also and uses 5v TTL levels.

https://www.midi.org/specifications-old/item/ … 0-specification

PS: There was a hack that involves exchanging the quartz crystal of an classic, ISA-based serial port with a different one. This fooled the software side (DOS, BIOS) of the COM port thinking it was running at a standard baudrate, while the port physically operated a 31250 Baud.
Not sure if this involved an 16550 UART's FiFO, though.

Edit: Typos fixed.

Edit: As for that special cable, well I don't know. If the device was made with RS232 in mind then it is okay.
If it originally was made for Japamese computers, PC-98 series, FM Towns, etc. I'd be more careful.
These platform may use other serial ports.
The C64 and Macintosh (68k based) platform had non-PC compatible serial ports, after all.
Hm. Maybe diodes can be used to make cable more safe, not sure.Sorry. 🙁

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