Re: Does anyone know what OPL2 "composite sine mode" even is, or what used it?
Posted on 2014-08-12, 00:21
I'm not sure if the dosbox opl emulator emulates it. LN
Re: Does anyone know what OPL2 "composite sine mode" even is, or what used it?
Posted on 2014-08-12, 00:04
It's CSW (composite Sine Wave) synthesis; it also involves the two opl2 timers, and I believe it works almost identically to how it works on other chips like the ym2612 used on the sega genesis. One timer controls pitch, the other controls maybe pulse width? Edit: CSW speech synthesis for dummies: …
Re: Anyone have a real MPU-401 or MPU-IPC spare?
Posted on 2013-08-18, 16:09
I suppose its possible! The first product Midiman (Who still exist, as M-Audio) made was called (unsurprisingly) the 'midiman' and did fsk-timing-recorded-to-a-cassette the same way the mpu-401 did; Making the MM-401 was sort of a logical next step (implementing the intelligent mode and other stuff …
Re: Anyone have a real MPU-401 or MPU-IPC spare?
Posted on 2013-08-13, 18:24
If you have the means to, can you dump that rom from the MM-401? I'm curious if Midiman stole or licensed Roland's 6801 code from the real mpu-401 module/card, or wrote their own code from scratch. LN
Re: Possible project: preserve/replicate our hardware!
Posted on 2013-05-06, 16:17
If a ROM dump of the internal code of the Roland mpu-401 'intelligent mode' microcontroller (HD6801V0B55P AKA r15179222) is needed for this project or for disassembly/reverse engineering to help make a fully compatible replacement, please let me know. It has been dumped as of mid-April. LN
Re: Munt development ?
Posted on 2009-06-08, 21:05
You can watch current progress at the munt cvs page on sourceforge: http://munt.cvs.sourceforge.net/viewvc/munt/ LN
Cycle accuracy in cpu core?
Posted on 2009-05-11, 16:45
I haven't really looked into the way the cycles/etc code and stuff actually works for the dosbox 80x86 cpu core, but are the number of cycles consumed per opcode consistent with documentation for the 8086, 80286, 80386, etc? Someone told me a while back that the cycle code in dosbox consumed ONE …
Re: How do I get the ROM of my RAP-10 card?
Posted on 2007-06-24, 18:40
If you want to extract the rom, you'll have to do it the old fashioned way: You'll need to desolder the rom chips from the card, and read them using a rom reader. If you're really dead-set on doing this, I can provide additional information. Currently dosbox does not emulate the rap-10 card in any …
Re: Munt development ?
Posted on 2007-06-17, 17:06
I apologize for that mistake. Sorry.
Re: Radio MT-32
Posted on 2007-06-07, 03:57
Crap, I've had a lot of problems recording LV, sorry. I think you'll have to count me out for that for now. LN
Re: Munt development ?
Posted on 2007-06-07, 03:38
Yep, its a digital rip from a v1.07 rom, pcb 01 unit. This is the HIGHEST POSSIBLE QUALITY you can extract from a v1.x mt-32 (15-bit digital)! Its digital all the way from the chip to the computer, no analog whatsoever! (A v2.x mt-32 and a cm-32L/LAPC-1 do 16-bit digital, but have some differences …
Re: soundblaster midi?
Posted on 2007-04-18, 02:23
I don't know, but don't forget that the first soundblaster card to TRULY support midi was the sb16. the sbpro and sb 2.0 had gameports which had the midi functionality, but afaik they could only be used as midi INPUTS, as they were not mpu401 compatible. the sb16 was. Lord Nightmare
Re: Radio MT-32
Posted on 2007-04-17, 22:42
You wanted Lost Vikings? Give me a few minutes to record it, and PM me an email to send the files to. Lord Nightmare
Re: Digital Audio from a Yamaha OPL2/3 chip
Posted on 2006-01-10, 18:11
The games in the pinball dreams series are also capable of playing digital audio via the opl2/opl3. All in all, its actually a fairly elaborate hack: You reset the OPL chip, then use the timer to count out exactly the length of time it takes for the sine envelope to reach the peak of the wave (1/4 …
Re: Missing Riser Card
Posted on 2005-11-01, 17:14
I have a pile of spare riser cards at home which I was looking to strip for parts. Email me and I'll send you images of them, so you can figure out which one you need. I have at least 3 of them in at least two different types, and i'm pretty sure at least one came from a packard bell. Lord Nightmare …
Re: How to extract MT-32 ROMs?
Posted on 2005-10-12, 06:30
Grestorn: backlight comes on? but no sound when you play midi into it. hmmm... is the volume knob turned all the way to the right (maximum setting)? try turning it on, then moving the knob to the middle and then the right, and then playing midi into it, and see if you get any sound. *If you DO, then …
Re: Fresh stuff from the ScummVM devel mailing list :
Posted on 2005-10-12, 06:14
First of all, way to necropost, guys! reviving a 7 month old thread that should've stayed dead. Secondly: DosFreak, you missed a few steps and got #s 2&3 wrong (theres no way to download the rom directly from the MT-32) Here's how to dump the MT-32 roms: 1. purchase mt-32 2. open mt-32 3. desolder …
Re: Request for help with Munt (not just coders)
Posted on 2005-07-27, 21:02
Kingguppy: I am in the process of adapting a GB-z80 disassembler to disassemble i809x code (it isn't easy). The i809x/i839x series is like a cross between a motorola cpu registerwise (it has a 232-byte register file as opposed to discrete registers) and an intel 8080 (CISC instructions). The most …
Re: Can I use the rom from a LAPC-1?
Posted on 2004-07-16, 15:43
If you either dumped the rom directly from the chip on the lapc-1 card (you need to desolder it I believe) or got it from someone who did, it MIGHT be usable (I'm guessing its the same bizarre bit-misordered format as the regular MT-32) but will probably need a new offset definition file. You should …
Re: Weekly update
Posted on 2003-09-19, 04:25
I have a similar problem in linux: cat /dev/midi DOES give MIDI data, but it loses *whole bytes* from the stream of data sent by the keyboard I have attached to the computer. It doesn't do that in windows, from what I can see. Its probably an ALSA bug in the MIDI input system for OPL3-SA2 cards ( …
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