Emulating the DX7 the HARD way. Part 1.

  Рет қаралды 18,405

plgDavid

plgDavid

Күн бұрын

chipresearch episode 0x07
00:00 Intro
02:00 Goals
02:43 Sub CPU
05:21 Main CPU
06:23 Address Map Investigation
07:59 Cartridges
11:09 Firmware Analysis
14:42 Skeleton MAME Driver
18:24 End of part 1
Get chipsynth OPS7 here plogue.com/products/chipsynth...
Tracks used:
GGS V - OPS7
Apoplexia - U OPS7T M8
madbrain - Blue Tangerine
From the official chipsynth OPS7 launch album
/ chipsynth-ops7
Channel intro/outro:
Apoplexia - Vega Genesis
From the official chipsynth MD launch album
toycompany.bandcamp.com/album...
Follow me / plgdavid
Follow Hubert / mrmadbrain
Support us by getting an OPS7 license (or gifting one to a musician friend!)
Thank you!

Пікірлер: 125
@mvh2275
@mvh2275 Жыл бұрын
I just purchased the Chipsynth OPS7. This software is incredible. I have the original DX7 and my initial impression is the software just blows the thing away. You guys did an outstanding job and thank you for bringing it to the market at a reasonable/affordable price. My thoughts - cheers
@Aidan_Lawrence
@Aidan_Lawrence 2 жыл бұрын
YES! What an incredible feat of reverse-engineering. Not only is your work terrific, but it’s so awesome to have a high-quality overview of the DX7’s hardware and software. It’s surprisingly difficult to even find high-quality photos of the mainboard, let alone a full dissection of the synth. In a way, it feels like this iconic synth was just properly “preserved” and I love that. SOOOO cool and congratulations!
@plgDavid
@plgDavid 2 жыл бұрын
This reads wonderfully and brings so much joy to my heart and mind.
@oliro
@oliro 2 жыл бұрын
I don't think you talk too much. When I was coding I often found the solution I was looking for when someone on a KZbin video was diverging off the subject to explain a particular pain in the a%% he had to solve, which often time he's not the only one to have to deal with it. I think details like that makes it even more useful.
@SynaMax
@SynaMax 2 жыл бұрын
Seeing the DX7 in MESS debugger reminds me of the little bit of debugging work I've done with the Fairlight CMI MESS/MAME skeleton driver; I hope that will get MIDI and audio functionality one day. Thank you so much for your hard work and research; I can't wait to buy OPS7!
@plgDavid
@plgDavid 2 жыл бұрын
Yes I followed that (and still do) the Fairlight is another monster to emulate. Props!
@SoundAuthor
@SoundAuthor 2 жыл бұрын
I really admire your attention to detail here. I didn't understand much of it, but your razor-sharp focus on the modeling is really inspiring.
@owenpalmer6540
@owenpalmer6540 2 жыл бұрын
Stuck around till the end; eager for part 2
@beat2009
@beat2009 2 жыл бұрын
This is amazing. Can't wait for the next part.
@IRONSILVER22
@IRONSILVER22 2 жыл бұрын
Top notch stuff, looking forward to the next installment. The extended sy-77 waveforms will be a totally sweet, especially considering that there is very little emulation for anything in the SY range. Thank you for your hard work!
@samplehunter
@samplehunter 2 жыл бұрын
There was an ancient vst plugin which tried to emulate the FM core of an SY77. I think its name was VX7. I remember it was quite unfinished and still very buggy and was not further developed.
@idiotisterecords
@idiotisterecords 2 жыл бұрын
You have no idea how much this effort means to me, I lost my TX7 and could immediately tell you nailed this!
@johnsaunders6510
@johnsaunders6510 2 жыл бұрын
Thanks for the deep dive. I used to have a DX7 when they first came out and it was a wonder. Amazing it was using mostly off the shelf parts.
@MintythecatIsABeast
@MintythecatIsABeast 2 жыл бұрын
Very good to see and you've clearly done lots of detective work on the DX7. I recently got my DX7 out having got my hands on a DT7. I was in a music shop the other week and the guy int here - helpful that he was - showed me a few current day FM Synths. None of them sounded like a DX7 - all too clean and without the right character. I know the sound of a DX7 and it's entirely non-PC :D It's great to see your work in emulating and investigating these older machines. And yes, we did indeed use 138 all the time in those days :D
@Lantertronics
@Lantertronics 2 жыл бұрын
What an amazing bit of sleuthing!
@fredconte
@fredconte 2 жыл бұрын
no words to describe your journey - fantastic content!
@ircluzar
@ircluzar 2 жыл бұрын
awesome stuff, looking forwards to part 2
@midierror
@midierror 2 жыл бұрын
Amazing work David, love this! My mind boggles at how deep you go into this stuff, your dedication is really inspiring and the results sound frikkin awesome!
@plgDavid
@plgDavid 2 жыл бұрын
Thank you so much! Part curiosity, part obsession, part challenge.
@nookcyan
@nookcyan 2 жыл бұрын
Awesome information, thanks a lot David!
@jameshagerman
@jameshagerman 2 жыл бұрын
Ack!! You were just getting into the good bits! I've got an Ensoniq VFX and ESQ-1 and am working through understanding the existing MAME emulations. Knowing more about how you performed RE on the DX7 chips is super interesting! Keep up the good work!
@plgDavid
@plgDavid 2 жыл бұрын
I should eventually finish part2. It takes a lot of time.
@expertmax32
@expertmax32 2 жыл бұрын
Tout simplement génial !! J'ai bien hâte de visionner la 2ieme partie.
@BigSneakySnake
@BigSneakySnake 2 жыл бұрын
Thanks for the deep dive, I'm looking forward to future videos :)
@rendragd
@rendragd 2 жыл бұрын
Ahhh...takes me back to early eighties engineering school and my AppleII synth project...
@electronash
@electronash 2 жыл бұрын
This is neat. I love stuff like this. Have you done much work with the LA32 / D-50 yet? I did a basic register map for the LA32 a while back. I think MUNT basically does HLE for the actual synthesis part. I hooked up an FPGA board to the LA32 on a D-20 board, and had the FPGA output a hex dump of a small RAM block via VGA. The RAM block mirrored the register writes to the LA32, so I could see in realtime when I changed the patch parameters like ADSR etc. The ultimate aim would be to do a full D-50 core on FPGA, but it's quite a big project. I'd love to work on that again if I ever get chance, but it's a bit low on the priority list atm. Don't worry, btw, I think most people watching do enjoy the more in-depth nerdy details. ;)
@PJFox-lo8pi
@PJFox-lo8pi 2 жыл бұрын
Looking forward to the next part! Thanks.
@moliver_xxii
@moliver_xxii 2 жыл бұрын
can't wait for part 2 amazing job!
@SpaceDisease
@SpaceDisease 2 жыл бұрын
Wild stuff. Glad to see ppl doing the work to create a dx VST that actually sounds big and sharp!
@neonvoid
@neonvoid Жыл бұрын
Incredible achievement, congratulations.
@jerzilla3795
@jerzilla3795 2 жыл бұрын
This was awesome. Can’t wait for the next video!
@iyatemu
@iyatemu 2 жыл бұрын
>Part 1 Oh good, it gets longer.
@LenPopp
@LenPopp 2 жыл бұрын
I'd love to see a part 2 video! I'm trying to figure out how to make a DX7-like module for my homebrew synth, and this is good info.
@mikosoft
@mikosoft 6 ай бұрын
I never knew DX7 was actually a full on computer, interesting stuff. Also I'm glad I had basic course in microprocessor design at university and I can actually understand what's going on
@OllyWoo
@OllyWoo 2 жыл бұрын
This is amazing, David, I basically spent most of my life trying to build my own DX7 😜 I got as far as writing the firmware of the TX81Z for a 32 bit Arduino using a Chinese YM2151 and YM2414B. I was going to use my analyzer on the TX81Z to find out the undocumented codes of the latter chip but thankfully someone in Japan had already reengineered the firmware. Can't wait for part 2 😀
@plgDavid
@plgDavid 2 жыл бұрын
Fun right? I go both straight recycled and remarked YM2151 and YM2414B from China too (I have a video on that). We have our own reverse engineering of the DX100 and TX81Z firmware. Maybe one day we will make something with that ;)
@OllyWoo
@OllyWoo 2 жыл бұрын
@@plgDavid that would be amazing. Also, I did watch your fake chip video, and indeed some of my chips seem legit and some have the same factory date and are too smooth 😉 I always thought they were cloning the chips not recycling them. Hoped you were making a hardware rebuild tbh, I think there is a market for a small desktop module as well. For now, I got myself a TX802 earlier this year 😜
@plgDavid
@plgDavid 2 жыл бұрын
@@OllyWoo I have various hardware FM synth prototypes and possible partnerships. Time will tell
@Robert_Babicz
@Robert_Babicz 2 жыл бұрын
so cool
@juno6
@juno6 2 жыл бұрын
Very interesting data!!!
@patto2k358
@patto2k358 2 жыл бұрын
Thank you for sharing!
@WARDISWARD
@WARDISWARD 2 жыл бұрын
Plogue is to chip emulation as u-he ,cytomic and softube are to analog emulation These are the big boys !!
@francoisbasquin6974
@francoisbasquin6974 2 жыл бұрын
Je fais partie des 5 qui sont restés jusqu'à la fin, et j'attends avec impatience le prochain épisode! 😁 Merci David
@synchromesh
@synchromesh 2 жыл бұрын
Subscribed! Great stuff, I'd love to see you go through your Vectrex as well. :)
@Lantertronics
@Lantertronics 2 жыл бұрын
I'm still here! :)
@BaumInventions
@BaumInventions 2 жыл бұрын
Wow. That is really cool to see... I am reverse engineering a Alesis 90s Drumcomputer at the moment... Not to deep... just to understand the way patches and samples and the Hardware is controlled... I found hardware access to the ports in the code and was wondering how always 3 bits got frequently controlled in the same way but not the rest. i took apart everything and found out that the 3 bits control the 3 datalines going to a 74HC138 ...And that chip is controlling with 3 inputs all the chip select of each perepherial like Display etc. Basically the same you found out at 7:05 ... I guess they are all just cooking with water :D
@plgDavid
@plgDavid 2 жыл бұрын
Ha great stuff. yes 74*138 and 139 are the bread and butter of 80's computer/arcade design!
@chrisliddiard725
@chrisliddiard725 2 жыл бұрын
Facinating ... I hadn't heard of IDA your reverse engineering tool, so that alone was worth the ticket. Maybe a dedicated video on how that works might be in order. Thanks for sharing.
@ArtemioUrbina
@ArtemioUrbina 2 жыл бұрын
Thanks for making this, I wish you wouldn't limit yourself and made this 1 or two hour long =)
@plgDavid
@plgDavid 2 жыл бұрын
Its hard to find the right level of complexity. I know that I could go much deeper and many of you would enjoy it still. Haha
@ArtemioUrbina
@ArtemioUrbina 2 жыл бұрын
@@plgDavid indeed, but this is great as a taste for many not familiar with a lot of what's involved and a good taste for those who do. Thanks for making it
@TreyMotes
@TreyMotes 2 жыл бұрын
@@plgDavid I think going mega long is perfectly acceptable on your personal channel. The shorter stuff is fine for the main Plogue channel.
@pinusniron8935
@pinusniron8935 2 жыл бұрын
Very good
@samplehunter
@samplehunter 2 жыл бұрын
Now I'm excited to see the upcoming Parts. Ever wondered why they needed two chips and if these 32 algorithms were hard coded or if the OPS could do custom algorithms.
@plgDavid
@plgDavid 2 жыл бұрын
Algs are indeed hardcoded in the silicon gates
@Bianchi77
@Bianchi77 2 жыл бұрын
Nice video, thanks:)
@pwmodulation467
@pwmodulation467 4 ай бұрын
David this video is incredible, do you plan to release Part 2 anytime soon where you explore the EGS and the OPS?
@plgDavid
@plgDavid 4 ай бұрын
Thanks. I learned my lesson not to ever say a part 2 is coming. It would be a month of work more or less. And I’m incredibly busy with out new products :/
@euglossine4ever
@euglossine4ever 2 жыл бұрын
This is amazing
@corri303
@corri303 2 жыл бұрын
awesome stuff
@rm-studios
@rm-studios Жыл бұрын
You’re a damn genius, sir!
@plgDavid
@plgDavid Жыл бұрын
Thanks but not really, just very very obsessive haha
@lifescansdarkly
@lifescansdarkly Жыл бұрын
Thank you so much for your dedication to recreating this classic with all its idiosyncrasies! Two questions for you: 1: In some OPS7 comparisons I've heard, the hardware DX7 had a slightly sharper sound. This could be down to differences in reference hardware, but I'm wondering if it might be due to velocity mapping. I know the DX7 keybed can only output up to 100 velocity, vs. modern keybeds which output up to 127. Would you recommend remapping or limiting the velocity info we're sending to OPS7 for maximum authenticity? 2: I'd like to use OPS7 to recreate a TX816 in the box. When you're changing master tune on each of the TX modules, you have a range of +/- 64, with each step corresponding to about 1.2 cents (technically 1.171875 cents, but who's counting). Does OPS7 allow us to change master tune in fractions of a cent? And/or can you use the TX mode of changing tune in 1.2 cent increments? This is getting into the realm of the *super* nitpicky but I have such great memories of that lush sound and would love to be able to recreate it perfectly.
@plgDavid
@plgDavid Жыл бұрын
hey so 1) Its a convoluted topic for sure with many variables. OPS7's Firmware Behavior settings include Velocity mode where you can choose the velocity calcs made by the original keyboard when receiving external MIDI OR when hitting the keys - and it IS possible to get values higher than 100 if you whack it dangerously. Thats just how the sub cpu and main cpu does it that could have been better. 2)There are about 5 million settings you can tweak for pitch/tuning in OPS7. We didnt want to limit ourselves to just the firmware precision but to the EGS/OPS precision there. SO you can not only use the same MASTER TUNING knob of a real DX7, but also retune using MTS-ESP or Scala scales or a combination of all.
@plgDavid
@plgDavid Жыл бұрын
If you want to emulate subtle detune between virtual TF1 units (of a TX816/TX216), better to load multiple instances and adjust to taste.
@lifescansdarkly
@lifescansdarkly Жыл бұрын
@@plgDavid Amazing, thank you for your response! I'll be purchasing the synth this weekend, looking forward to diving in.
@lifescansdarkly
@lifescansdarkly Жыл бұрын
@@plgDavid I've been playing with the VST today, and I really have to commend you on your work here. It's done what all the other DX emulations have failed to do, capturing that digital edge and fuzz that was the hallmark of the sound. I stacked up 8 instances to create a TX816 and compared it to some recordings of the hardware unit I used to own, and it's pretty much indistinguishable. Thank you!
@Algoritmarte
@Algoritmarte 2 жыл бұрын
Simply i.m.p.r.e.s.s.i.v .e. !!!
@martingerken7094
@martingerken7094 2 жыл бұрын
Thanks for all the nerdy details. I was please to see some of my hobbies move nearer to each other: calssical video game emulation and synth! I'd be happy if you'd give some details of how DEXED works...
@plgDavid
@plgDavid 2 жыл бұрын
Thanks! But I havent looked at the DEXED code at all. This is 100% independent research
@martingerken7094
@martingerken7094 2 жыл бұрын
@@plgDavid ok, thanks. Can anyone else point to the technical background of Dexed?
@lundsweden
@lundsweden 2 ай бұрын
The DX7 is the one we all remember, but didn't the DX9 (cut down 4 OP) the DX1 (mega expensive version with massive case, better UI and weighted keyboard) and DX5 all released in 1983, and all worked pretty much the same way?
@plgDavid
@plgDavid 2 ай бұрын
Yes, though the DX9 is voluntarily down powered
@lundsweden
@lundsweden 2 ай бұрын
@@plgDavid Do you mean it has the same chips as a DX7, but is intentionally "feature reduced" by Yamaha?
@plgDavid
@plgDavid 2 ай бұрын
@@lundsweden precisely. Want to make a short on that. Might do it soon
@HenriDeCarvalho
@HenriDeCarvalho 2 жыл бұрын
@ 15:00... Arturia, Novation, Ableton, Spectrasonics, Roland, IT ingenier' s
@HenriDeCarvalho
@HenriDeCarvalho 2 жыл бұрын
Just joking, not into the game but always interristing to understand how it works
@spectralknights2
@spectralknights2 2 жыл бұрын
Nice. Thanks for making this. I hope u also make ensoniq SQ80, even though arturia made it recently
@spectralknights2
@spectralknights2 2 жыл бұрын
I just love the sound of it's 8bit wavetable and not too many emulation out there.
@jackcimino8822
@jackcimino8822 2 жыл бұрын
I rather have DW8000. Sounds so crisp and can mimic many synths of its time.
@jackcimino8822
@jackcimino8822 Жыл бұрын
@@chinossynthesizer705 What do that have to do with what I said? Plogue is making a SID chip emulation, as well as a Famicom and TX81Z synth.
@chinossynthesizer705
@chinossynthesizer705 Жыл бұрын
@@jackcimino8822 korg dw8000 is overrated 😴
@jackcimino8822
@jackcimino8822 Жыл бұрын
@@chinossynthesizer705 Nope, you are! Aside from the lack of PWM, the DW8k and its successor, DSS-1 are underappreciated. You can mimic PWM on the DSS-1 using the modulation delay as a flanger
@nrdesign1991
@nrdesign1991 2 жыл бұрын
I've had my fair share of playing the DX 7, both a real unit and Dexed. It's a very versatile synth if you respect its limits.
@isaacanthonydj4124
@isaacanthonydj4124 2 жыл бұрын
you can plug your iPhone into the newer Roland synthesizers, and use them to control DEXED on it's own channel on your synthesizer. It's pretty slick...
@isaacanthonydj4124
@isaacanthonydj4124 2 жыл бұрын
i am not a fan of the dexed UI at all, LoL
@fkthewhat
@fkthewhat 2 жыл бұрын
Would love to know how to use this knowledge to make a midi controller for the DX7 (with the ability to edit parameters on the fly without notes being cut off etc)
@plgDavid
@plgDavid 2 жыл бұрын
That only happens if you send a full patch to the DX7. Individual single param sysex do not interrupt voices.
@anonymous_friend
@anonymous_friend Жыл бұрын
@@plgDavid So this can be done? Have you tried to use patch base to design a touch pad midi controller for a dx7?
@plgDavid
@plgDavid Жыл бұрын
@@anonymous_friend afraid not
@eobet
@eobet 6 ай бұрын
Stumbled upon this so I’ll ask here as well… any plans for CLAP and MPE support?
@plgDavid
@plgDavid 6 ай бұрын
MPE has been there since day one. CLAP is in beta in our forums. Regards
@ArtFluids
@ArtFluids 2 жыл бұрын
Could all this FM chip research be used to make a super-accurate Adlib/OPL3 General MIDI plugin? Some way for us to play back old DOS game MIDI files with extreme accuracy?
@plgDavid
@plgDavid 2 жыл бұрын
chipsynth PortaFM already plays OPL3 vgms, so yeah _technically_ we have bit accurate cores that could do that.
@ArtFluids
@ArtFluids 2 жыл бұрын
@@plgDavid I guess someone would just have to dump the General MIDI programs/patches from the old Adlib board. I have no idea where to look for that. I mean, software like DOSBox must have those patches in there somewhere.
@TechM3X
@TechM3X 2 жыл бұрын
It would be cool if you could include the option to emulate 24 bit D/A Converters in addition to add the additional chip emulation required to power the Yamaha DX5
@plgDavid
@plgDavid 2 жыл бұрын
Technically the DX5 is not that far off from OPS7, like the DX5 we have two sets of EGS/OPS pairs (in A and B banks). The core maths do not have more precision than 15bits however. So DX7II got the max out of those maths.
@MauricioPiomboChanel
@MauricioPiomboChanel 2 жыл бұрын
Come on!!!
@alex-esc
@alex-esc 2 жыл бұрын
1:49 the licc
@plgDavid
@plgDavid 2 жыл бұрын
One of the tracks on MD's compilation ended with this, I thought it was a fun tongue in cheek thing to use for the splash. Being doing that ever since. Also fan of @Adam Neely
@MrOuija-rr8kq
@MrOuija-rr8kq 2 жыл бұрын
Synthesizers get ‘Nam flashbacks when they hear NIN
@mechatomb2921
@mechatomb2921 2 жыл бұрын
Gonna eat up this series and get some C/C++ Knowledge down lmao. DX7 was something I hated bc of the presets, but once I got into FM synthesis I had a newfound respect for the synth architecture and the lo-fi dacs. One thing that makes FM shine is modulating it in real time. WIth Dexed it's super easy with automations. With the Digitone (only 4op.) you get into some wild territory thanks to the ready access to live tweaking in the sequencer. Stuff like AdLib Tracker, RADTracker, DefleMask, M8 Tracker (Headless or the hardware version), DAFM, MEGAFM, etc. really give you more ability to push them to the max.
@arxaaron
@arxaaron 2 жыл бұрын
Has part II ever materialized?? (not finding on search)
@plgDavid
@plgDavid 2 жыл бұрын
No. Making part I kind of burnt me out. Not sure when it will be finished.
@arxaaron
@arxaaron 2 жыл бұрын
@@plgDavid Understood... and understandable. The level of reverse engineering you are doing is awe inspiring. (: I know just enough of the tech to hang in an ride out the whole video.. :). I have a DX21 myself and assume that most of the DX7 tech is also applied in scaled down form there. I'm (very slowly) working on developing MPE instruments that could utilize your synth engines, so I'll be following your progress.
@acreil
@acreil 2 жыл бұрын
Now do the GS-1. And the ELX-1.
@plgDavid
@plgDavid 2 жыл бұрын
I'll answer the other comment in the company channel.
@bhamadicharef
@bhamadicharef Жыл бұрын
Any hints where is "Emulating the DX7 the HARD way. Part 2" ?! 🙂
@plgDavid
@plgDavid Жыл бұрын
Making part one (and the synth itself) burned me quite a lot and needed a break. I have half of part 2 shot, but there is a whole lot of work to be done and my time is requested on the next synth a lot
@bhamadicharef
@bhamadicharef Жыл бұрын
@@plgDavid what are the Mame modules you contributed ? Cannot find David searching github
@6581punk
@6581punk 2 жыл бұрын
I thought being as techy as you are there would be Linux versions of your VSTs.
@tssf
@tssf 2 жыл бұрын
Why stretch the resources of a company so thin to support a platform less than a low percentage of your customer base would actually use? That's like lower priority than supporting a niche feature that no one would use in the product
@TreyMotes
@TreyMotes 2 жыл бұрын
@@tssf You are right, but there is one reason Linux support would be great. The potential to run the plugin on something like a Raspberry Pi and create a clean nice DX7 solution when paired with a cheap MIDI controller.
@tssf
@tssf 2 жыл бұрын
@@TreyMotes can't argue with that, that would be really cool. I know David is making a neat portable synth in a cartridge for Famicom, wonder if dx7 will be in it too? But yeah no doubt it'd be awesome to have a portable version of the entire chipsynth suite and maybe put it into a tiny little dx7 clone or something
@tssf
@tssf 2 жыл бұрын
But ARM Linux is even more niche than Linux ;)
@plgDavid
@plgDavid 2 жыл бұрын
@@TreyMotes Hey. Making a Linux version just to eventually port to ARM hardware is not necessary here. All our chipsynth cores already run fine on a STM32H7. I made all those examples on my twitter earlier this summer. The issue with Linux is the variety of distros and UI toolkits. We have our own custom UI classes and would want to do the same on Linux and its an pretty significant endeavor. I would rather do hardware tbh.
@eliasknaapinen
@eliasknaapinen 2 жыл бұрын
The content of this video is incredible, but next time please no background music. It just distracts from the content it self.
@plgDavid
@plgDavid 2 жыл бұрын
Interesting others have complained of the opposite on some of my older vids
@pepinillosazucarados6743
@pepinillosazucarados6743 2 жыл бұрын
FOR ME THE BEST EMULATION ON SOFTWARE IS THE ARTURIA DX7
@albionpatterns3986
@albionpatterns3986 2 жыл бұрын
How to waste your life away... Dude unplug your damn toys and GO OUTSIDE
@plgDavid
@plgDavid 2 жыл бұрын
😂
@anonymous_friend
@anonymous_friend Жыл бұрын
We need more people like him. A lot of people have no usable skills.
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