s|ugfish wrote on 2023-01-28, 23:54:

I'm using the Opl2LPT2 v2 on a lenovo m32 thin client .running free dos . I was wondering if anyone had any sugrestions to reduce the level of buzzing I'm currently encountering with it. I've tested it with an exsternal power source, and using usb power from the m32 . In both cases the volume is very low, and their is a high level of 'noise' . Initialy i thought it was a grounding loop or some crappy speakers but i've tested multiple speakers and tried swaping to an exsternal power source. Any sugestions would be much appreciated.

Well as much as i would rather this post fade into nothing ness, I wanted to say thanks to everyone who offered help in this space. After trying with standard head phones per Dreamblasters sugestion....i realized i just wasn't plugging in the speaker jack well enough.. soooo dumb.

Thanks y'all for your help . and for such a cool little device.

Here’s a thought: Would it be possible to change the lpt port address to 0388 by editing the bios? My Schneider EuroPC’s bios setup shows the address of the lpt1 but it’s not changeable. Since the only ISA slot i have is already occupied by the XT-IDE, I figured I might as well modify and make a custom bios that sets the address of the lpt port to 0388, assuming it’s doable that way. That way, I wouldn’t need to try to patch every game I might want to play.

No.
But instead games can be patched to use 3bc instead of 378h

Footage: https://www.youtube.com/watch?v=wPNGSrx_gtc

This is my new little midi to YM3812 vgm conversion tool I'm currently working on. Unfortunately, it still fails on many files during the midi parsing or note alignment, but at least, it can produce a fine result on some. I will have to add more options in the future. I designed it for my theoretical Atari 2600 add-on in the future that will have a YM3812 on board.

The program is specially designed around the YM3812, it fetches the midi notes on the 9 OPL2 channels so it will play as many notes of the channels as it can while counting where it would require the leat bytes to write for the instrument changes.

The project was made in Intel Fortran.

Project available here: https://github.com/MemberA2600/MID2OPL2
Combined with my player, you can enjoy your midi files on your modern PC pretending it's still the early 90's.

matze79 wrote on 2023-02-15, 06:53:

No.
But instead games can be patched to use 3bc instead of 378h

Sigh... If only all game developers had the discipline and foresight to properly look up the I/O port addresses of the available LPT ports in the BIOS Data Area, instead of just lazily hard-coding the I/O addresses that the original IBM PC happened to use... That's the way it was supposed to be done, even back then. It wouldn't have affected performance in the slightest, and it would've been easy to do. 🙄

It would be nice if parallel port I/O address patches would add a BDA lookup routine. Although I understand that would make the patches much more complex, since just replacing a few bytes in-place wouldn't be enough at that point.

I gonna upload my conversions to this playlist.

https://www.youtube.com/watch?v=h83EtkUJ1o4&l … OYpOitg6AWhjBQH

I never have imagined that the rules of midi were made to be kicked up. 😁 So now I have to make sure all the files on my computer converts without any exception and will give a tolerable result, after that I will have to do a lot of finetuning.

Riveiro made a video playing midi files, using dosmid on opl2lpt:
https://youtu.be/ubmClncOmaw?si=lPqpuqYYXbSv5dpF