MTS-100 midi2cv Source Code?

andrewF · Posted: Thu Jun 07, 2007 7:56 pm Post subject: MTS-100 midi2cv Source Code?

I bought this kit from Midwest Analog, blew it up, bought a new PIC from Thomas, all worked fine....'til one day i was working on another module and dropped a patchcord just so it shorted the +5 and -15v terminals of my power supply and that was that. By then Midwest no longer existed.
Still have the MTS-100 PCB and now i have a PIC burner, so is there anyway i could get a copy of the source code for this???
thankyou

philpeery · Joined: Nov 08, 2006 Posts: 137 Location: new jersey, usa

Thomas Henry · Posted: Thu Jun 07, 2007 10:25 pm Post subject: Re: MTS-100 midi2cv Source Code?

philpeery · Joined: Nov 08, 2006 Posts: 137 Location: new jersey, usa

Does anyone know of a source for the mc68705p3 processor? My searches on mouser and newark came up empty.....

Dan Lavin · Posted: Fri Jun 08, 2007 5:17 am Post subject:

Phil: I've probably got a couple in my semi box and since I recently trashed my trashed and heavily part-pirated 68705 programmer, it's a safe bet I won't be needing them. I'd happily trade even up for 566's, CA3080's, or anything else that would be useful for TH designs.

On the other hand, redesigning (re-coding) this project for a PIC instead of a 68705 might be a good project for folks on this forum. I'd be willing to help after Bill and I finish the TH Keyboard as long as someone can handle the bulk of the PIC code. I can really use another Midi2CV as my PAIA Midi2CV8 is overkill for most of what I do.

philpeery · Joined: Nov 08, 2006 Posts: 137 Location: new jersey, usa

Hey Antman! If you have 2 or 3 laying around that you'd like to unload, I've got TONS of 3080e's that we could swap. I do have some 566's that I might be willing to part with, but I need to look at my list of projects that need them before I know how many I can give up. RIght now, I think I have about 20 or so. I do have a bunch of other chips too, lm394's, lm13600, 13700's, the list is long....

As far as loading the code on the chip, what's involved? I used to have an eprom burner, but I would bet that won't cut it.

Let me know what you'd take in trade!

Thanks and Best Regards,
Phil

Thomas Henry · Posted: Fri Jun 08, 2007 9:44 pm Post subject:

Okay, it took a little digging, but I found the source code you guys were asking about. I see by the date that this is the tenth aniversary of the MTS-100!

This is just a text file and can be viewed in any text editor. When I pump it through the cross-assembler, I change the file extension to .asm. Note that the code is heavily documented (as is my wont).

You might also remember that I coded the MIDI serial input by hand. There is no UART on the chip, and yet I was able to get the data in quite reliably. Back when I was a young pup, I used to love doing things like that. But that was in the good old days when 5-to-4 Supreme Court decisions hadn't been invented yet.

Anyway, hope this helps.

Thomas Henry

Mts100.txt

Description:

MTS-100 Source Code (read in any text editor)

Download (listen)

Filename:

Mts100.txt

Filesize:

19.3 KB

Downloaded:

873 Time(s)

andrewF · Posted: Fri Jun 08, 2007 11:41 pm Post subject:

wonderful - thankyou
nothing wrong with well-documented code.

I think i can get access to a 68705 burner at uni, seems to be at lot of 68xxx stuff there.
a bloke on ebay has plenty of chips buy-it-now $3.50

philpeery · Joined: Nov 08, 2006 Posts: 137 Location: new jersey, usa

Dan Lavin · Posted: Sun Jun 10, 2007 2:53 pm Post subject:

Phil:
I have 1 of the P3 and 2 of the U3's. The U's are a 40 pin expanded version, the P3's are 28 pins. I also have a P3 driving a TH Midi to Trigger for the past 15 years or so. But that's off limits until I update it! Anyway, the burn process is to burn a 2716 with the source code, then slap a 68705 and the 2716 into the burner and flip a couple switches and wait for a green and yellow LED to do their thing. The burner consists of a 4040, a couple 2N2222's, a 1N4742 zener (12V), a 1N4748A zener (22v), a 5 volt regulated power supply, 24V xformer, 1MHz Xtal, 11caps, 10 resistors, 5 diodes.
So basically you have to build one project to do another. I hate when that happens and it happens more than I like to admit around my house!

The following articles outline details:
1. 68705 Microcontroller by TH in Radio Electronics Magazine Sep 89
2. Part 2 of above Oct 89
3. The One Chip "Midi Computer" Meet the 68705 by TH, Electronic Musician April 89
4. 68705 Microcontroller Programmer by Brian Beard Electronics Now Jan 94
I'd be willing to throw in these articles and the Motorola data sheet if you're still interested. The P3 does have a window cover so I'm not sure what nonsense is programmed on there. You'd need to slap it into a Eprom eraser. I'd trade even up for 3080's. Email me your address off forum at lavins49456 (AT) yahoo.com if you're still interested.

On the other hand, I think I'll wait for some ambitious soul to port this code over into a Pic. Blue Hell, you out there?!

blue hell · Posted: Sun Jun 10, 2007 3:50 pm Post subject:

Dan Lavin · Posted: Sun Jun 10, 2007 4:26 pm Post subject:

BH:
Sorry to throw you the curve ball there. No, the MTS-100 is a Midi to KBD CV/Pitch Bend/Gate/Trigger circuit/program that TH did back with Midwest Analog Products.

I'll check out your project example, etc. when I have some down time this week and see if it'll help. I'd definitely want to finish the keyboard before tackling another forum project, though.

blue hell · Posted: Sun Jun 10, 2007 5:02 pm Post subject:

Ah, OK, that deconfuses me enough fttb.

Trumpet1 · Joined: Aug 02, 2007 Posts: 10 Location: Long Beach, CA

I did a custom MIDI->CV adapter recently based using an AVR micro (easier to write code for than PIC - my opinion). I was going from the MIDI message spec and took some shortcuts. It works, but sometimes locks up or picks the wrong voice if multiple keys are pressed - that sort of thing.

I'd like to improve my AVR logic. If by chance TH has a flowchart, or state diagram, or if anyone has developed one from his original source, I'd be interested. Otherwise I will try to port the PIC code to AVR from the source listing.

Plus, in general, look at the AVR for your controller needs. It has a relatively small instruction set, a small set of packages to learn (mainly just pick the number of I/Os and A/Ds you want onboard, etc.) compared with the innumerable PICs. Cheap homemade programmers, etc.

Dan Lavin · Posted: Fri Aug 10, 2007 8:00 am Post subject:

Trumpet1,

Try PM'ing philpeery. I traded all my 68705 articles and chips on this to him for a number of analog chips. He's a nice guy. I'm sure he'll be willing to assist you.

Thomas Henry · Posted: Tue Aug 14, 2007 2:42 pm Post subject:

Have I got a deal for you (he said as he furtively pulled his trench coat aside).

While cleaning the basement, I came across (70) MTS-100 MIDI-to-Synth and (32) ADV-MIDI printed circuit boards. These are nicely done, single-sided and tinned, but not silk-screened. Both are 4" by 6" in size.

I don't need money for these (apart from possibly the shipping, since we're talking several pounds of boards here), but would be glad to trade all of them for anything interesting. For example, I sure could use some 24VCT/smallish transformers or some tempcos.

But I'm open to just about any type of trade. Any takers?

Also, did you notice in the last Jameco catalog of a month ago or so that they stock the 68705. Seems to me it was around $25, which isn't much more than what I was paying some dozen years ago.

And this'll blow you away; they were stocking the NE566 (but at a fairly exorbitant price if I recall).

Thomas Henry

Thomas Henry

philpeery · Joined: Nov 08, 2006 Posts: 137 Location: new jersey, usa

Hi Thomas!

I have some 24vct transformers and both 1k and 2k tempco's, how many are you looking for? PM me if someone hasn't beat me to the punch!

Phil

Trumpet1 · Joined: Aug 02, 2007 Posts: 10 Location: Long Beach, CA

[quote="Thomas Henry"]

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

factus10 · Joined: Jun 20, 2007 Posts: 158 Location: Buffalo, NY

[redacted for jolly-roger-ist behavior]

See Thomas' comment below. No need to help those who help themselves Wink

Thomas Henry · Posted: Fri Apr 11, 2008 11:21 am Post subject:

I'm surprised his Web site doesn't sport the Jolly Roger as a banner.

Beware, his PCB had/has nothing to do with me.

Thomas Henry

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

I'm getting an MTS-100 and ADV-MIDI board through Phil. Anyone know if the ADV-MIDI schematics are available anywhere? I have already found the source code on archive.org (so no need for TH to go through old disks this time Wink

)

philpeery · Joined: Nov 08, 2006 Posts: 137 Location: new jersey, usa

Hi Etaoin,

I may be able to help you out with docs too. Sit tight!

Phil

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

Okay, I probably managed to get my hands on some 68705P3's (not sure until they arrive). Now on to programming them. I can erase and burn 2716's, so I'd like to opt for the programmer from the datasheet. However, 1 MHz crystals seem to be becoming obsolete. Mousers asks $13+ for them (and that's without shipping to EU). So still looking for that at a more reasonably price.

Also, does anyone have a cross-compiler? The code is small enough to compile by hand if necessary, but I'd rather use a compiler.

[edit]
Okay, I found a cross-compiler for the Amiga, and since I still have an Amiga, it might work.