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Kurzweil Midiboard Ver 3 Upgrade Keyboard Controllers
Old 9th June 2017
  #1
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Kurzweil Midiboard Ver 3 Upgrade

Hi all,

I was already the proud owner of a Japanese build Ver 3.0 Midiboard. I decided to pick up a second MB for a backup, found a Japanese build version 2.2, and wanted to see if I could upgrade it to Ver 3. I was able to reach Hal Chamberlin (the engineer behind the MB), and he provided me the Ver 3 EPROMs.

The upgrade went very smooth and took about ½ - 1 hours. I thought I would share my notes to help anyone else that was looking to do the same:

- Per the instructions that I received - there are 2 types of logic boards – the “long board” and the “short board”. The short board is around 12 inches long while the long board is much longer (18-24”). If you take the MB cover off – it will be the board in the back of the unit. My MB had the long board.

- There are two versions of the long board. You can tell which one you have by checking the P/N on the back of the label. The part numbers for MB units with the long board are 10001501 and 10001502. The installation instructions are just slightly different depending on your P/N. I am assuming that if you do not have either of these two P/Ns that you have a short board (I don’t know for sure, just deductive reasoning…).

- The long boards have an empty EPROM socket for the Ver 3 EPROMs, while the short boards require an additional daughter-board as part of the upgrade.

- For the long board upgrade, you need to cut jumper JP3 as noted in the photo.

- The EPROM version that I received from Hal was actually 3.1. The only difference between V3.0 and V3.1 is that 3.1 is more tolerant of gaps when merging a MIDI SysEx message received on the MIDI In jack with internally generated MIDI messages. This was required to work well with the Kurzweil K150 synthesizer sound modelling software.

Let me know if you have any questions. Hal stated that he has more Ver 3.1 EPROMs, and possibly daughter-boards. If you PM me, I will provide you Hal’s contact information.

Long Live PolyAT!!!

John

Midiboard part number:



Ver 2.1 EPROM and empty slot location:



Close up of EPROM and JP3 location:



Ver 3.1 EPROMS as shipped from Hal:



Ver 3.1 EPROMS installed:


Last edited by jgale; 6th July 2017 at 11:51 PM.. Reason: Added Images
Old 10th June 2017
  #2
It's great that Mr. Chamberlin, back than engineer but later CTO of Kurzweil, is still supporting this great product.

I need to pick up working on my editor for the dump, I have deciphered most of the memory based on the source code, would make programming it somewhat easier.
Old 10th June 2017
  #3
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jgale's Avatar
 

Quote:
Originally Posted by SoundsByJB View Post
It's great that Mr. Chamberlin, back than engineer but later CTO of Kurzweil, is still supporting this great product.
Agreed!! I felt lucky that I was able to get in touch with him.

My plan is to keep my MBs running as long as humanly possible. Maybe one day someone will develop another keyboard capable of Poly AT.

Let us know if you develop your editor for the MB. I think that this would be helpful. I find that if I haven't made MB program changes in a while, it requires me to have the manual out to get anything done. Even then it is something of a head scratcher...

John
Old 13th June 2017
  #4
Here for the gear
poly AT ; Elka masterboard 88key and VAX?
Old 14th June 2017
  #5
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jgale's Avatar
 

Sorry - I meant "new" Poly AT Keyboard which is mainstream (made by major manufacturer not a funded project). It would be great if you could order your favorite midi controller with Poly AT for an extra fee. But alas (sigh), I believe most keyboard players don't use this and it is more of a niche product.

But I can dream...
Old 15th June 2017
  #6
Quote:
Originally Posted by jgale View Post
Hi all,

I am not allowed to post images into posts as of yet - but I uploaded the MB photos to my public album - so you you should be able to see them...

Long Live PolyAT!!!

John
Some pics I previously made when installing mine:









Old 15th June 2017
  #7
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Quote:
Originally Posted by SoundsByJB View Post
Some pics I previously made when installing mine:
Perfect - thanks for posting these.
Old 16th June 2017
  #8
Here for the gear
nice to see the inside before opening. I have a faulty slider . someone know where to get new ones?
Old 16th June 2017
  #9
Quote:
Originally Posted by Analogbit View Post
nice to see the inside before opening. I have a faulty slider . someone know where to get new ones?
Attached the schematic and service manual, that should help you find out the specs of the current ones. Finding a replacement with similar specs probably isn't that difficult.
Attached Files
File Type: zip MIDIboard Repair Manual.zip (8.16 MB, 95 views)
Old 19th June 2017
  #10
Here for the gear
 

Dear John,

I have a midiboard (Suzuky keyboard and eprom v2.2 on the "large motherboard").
It would be a chance to contact M. Chamberlin to obtain the v3 or v3.1 eprom's.
Could you tell me how to do ?

I understood that 2 chips have to be installed in place of the v2.2 chip.
But what is "cut J1" ? I only see the "J8 chip receiver"...

Many thanks!
Sincerely,
Thomas.
Old 19th June 2017
  #11
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Hi Helie -I just sent you a private message with Hal's email.

I don't have enough posts yet to post pictures. I created a Public Midiboard Album on this site. If you look at my profile, you should be able to see my albums. In there, it will show you a picture of the location of J3.

John
Old 7th July 2017
  #12
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Hi All - I just updated my original post to include my pictures of the upgrade.

John
Old 7th July 2017
  #13
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synthpunk's Avatar
Nice job. Still using my old weighted Peavey DPM C8 controller but wish I had polyphonic aftertouch.
Old 16th August 2017
  #14
Rev 3 firmware

Hi igale,

could you perhaps send the eprom images via email?

Thanks
Luca
Old 16th August 2017
  #15
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Hi Luca - I don't have the eprom images. I would recommend reaching out to Hal Chamberlin at [email protected] and ordering the eproms. They were very inexpensive...

John
Old 17th August 2017
  #16
Quote:
Originally Posted by jgale View Post
Hi Luca - I don't have the eprom images. I would recommend reaching out to Hal Chamberlin at [email protected] and ordering the eproms. They were very inexpensive...

John
Hi John,

thank you for suggestion: I've just emailed him.

Best
Luca
Old 4th November 2017
  #17
Here for the gear
 

So with the addition of the new eprom, can a Midiboard without the arpeggiation parameters be equipped to do those? Sorry for my ignorance, I have an older version in my sights to purchase, and am finding too little about them. Thank you for any guidance.
Old 20th November 2017
  #18
Quote:
Originally Posted by Casbarian View Post
So with the addition of the new eprom, can a Midiboard without the arpeggiation parameters be equipped to do those? Sorry for my ignorance, I have an older version in my sights to purchase, and am finding too little about them. Thank you for any guidance.
Yes
Old 25th August 2018
  #19
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Quote:
Originally Posted by jgale View Post
For the long board upgrade, you need to cut jumper JP3 as noted in the photo.
My apologies for reviving this old thread. I have ordered the EPROMs from Hal and wanted to get some guidance before tackling the upgrade.

When you say “cut jumper JP3” do you have to physically cut something on the pcb? What did you use?

Is there any soldering involved when installing the new chips?

Thank you.
Old 25th August 2018
  #20
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jgale's Avatar
 

Quote:
Originally Posted by b3nji View Post
Quote:
Originally Posted by jgale View Post
For the long board upgrade, you need to cut jumper JP3 as noted in the photo.
My apologies for reviving this old thread. I have ordered the EPROMs from Hal and wanted to get some guidance before tackling the upgrade.

When you say “cut jumper JP3” do you have to physically cut something on the pcb? What did you use?

Is there any soldering involved when installing the new chips?

Thank you.
Hi - there is no need for soldering the new chips - you just pop the old chip out and put the new on in its place. If you don't have a chip puller, you carefully pry up the chip from both sides with a small flat screw driver and try to pull it out straight or you may bend pins. When putting the chip in, make sure it is oriented correctly. Their is notch on top of the chip and it should face the same way of the chip you just pulled out.

I usually put the new chip legs lightly in the socket on one side, and then push the chip towards that side until I get all legs sitting in the socket lightly - then I carefully push down. You will want to inspect to make sure every leg is correctly in the socket.

As far as JP3 - it is a small wire jumper that connects two holes in the board. You just snip it with a pair of needle nose wire snips, then bend the wires up slightly to ensure that the do not touch anymore.

Good luck and enjoy your Midiboard!

John
Old 25th August 2018
  #21
Lives for gear
 
Phil Aiken's Avatar
 

After picking up a Japanese version 2 Midiboard last year, I tracked Hal down as well, and purchased the EPROMs for version 3 but have not installed yet. By coincidence I brought the Midiboard home from my rehearsal space yesterday, so this post is inspiring me to upgrade.
Old 18th November 2018
  #22
Here for the gear
 

Midiboard 3.0

Hi there,

I am also a proud owner of a working Midiboard with 3.0 OS. I'd like to thank you all for this thread.

I'm wondering if upgrading to version 3.1 is worth the trouble. Any advice?

Cheers from Rio de Janeiro - Brazil
Old 18th November 2018
  #23
Gear Head
 
jgale's Avatar
 

Quote:
I'm wondering if upgrading to version 3.1 is worth the trouble. Any advice?
This is from an email Hal sent me when I asked the same question:

"The only difference between V3.0 and V3.1 is that the latter is more tolerant
of gaps when merging a MIDI SysEx message received on the MIDI In jack with
internally generated MIDI messages. This was required to work well with the
Kurzweil K150 synthesizer sound modelling software."

John
Old 2 weeks ago
  #24
Hello, I am a proud Midiboard owner too...
sorry for the slightly off topic question...
does anyone know what to buy as a MIDI Volume Control PEDAL for the MB and how to set it up ?
Thank you !!!!
Old 1 week ago
  #25
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Quote:
Originally Posted by stevegalante View Post
Hello, I am a proud Midiboard owner too...
sorry for the slightly off topic question...
does anyone know what to buy as a MIDI Volume Control PEDAL for the MB and how to set it up ?
Thank you !!!!
The Midiboard uses a 5 volt loop from the output jack back into the input jack. This needs to be regulated by the pedal.

I use a Yamaha FC7. I split the stereo jack of the FC7 into left / right mono jacks by using a stereo to mono Y-cord. It works great.

You could also use a pedal that generates 0 - 5 volts and connect that to the pedal input jack.

Once the pedal is set up - you can assign it to generate any midi CC output.

John
Old 1 week ago
  #26
Quote:
Originally Posted by jgale View Post
The Midiboard uses a 5 volt loop from the output jack back into the input jack. This needs to be regulated by the pedal.

I use a Yamaha FC7. I split the stereo jack of the FC7 into left / right mono jacks by using a stereo to mono Y-cord. It works great.

You could also use a pedal that generates 0 - 5 volts and connect that to the pedal input jack.

Once the pedal is set up - you can assign it to generate any midi CC output.

John
Thank you John, so FC7 stereo out/split into 2 mono/into the control pedal jacks of the Midiboard, correct ? Thanks again
Old 1 week ago
  #27
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Quote:
Originally Posted by stevegalante View Post
Thank you John, so FC7 stereo out/split into 2 mono/into the control pedal jacks of the Midiboard, correct ? Thanks again
Yes - that is correct.

If I remember correctly - when plugging the Y-cord into the Midiboard, the jacks need to be in a certain order. If you plug the FC7 in and it does not achieve the CC depth that you expected, try switching the Y-cord connections to the Midiboard and that should correct it.
Old 1 week ago
  #28
Quote:
Originally Posted by jgale View Post
Yes - that is correct.

If I remember correctly - when plugging the Y-cord into the Midiboard, the jacks need to be in a certain order. If you plug the FC7 in and it does not achieve the CC depth that you expected, try switching the Y-cord connections to the Midiboard and that should correct it.
Thanks !
Old 13 hours ago
  #29
Quote:
Originally Posted by jgale View Post
Yes - that is correct.

If I remember correctly - when plugging the Y-cord into the Midiboard, the jacks need to be in a certain order. If you plug the FC7 in and it does not achieve the CC depth that you expected, try switching the Y-cord connections to the Midiboard and that should correct it.
Hi John, so I bought an FC7 + splitter, but I can't get it to work...
tried both pedals, swapped the two mono jacks on both...
Do you remember which parameters on the midiboard you have to set ?
I believe it's 19 and 20, but to which destination ?
Let me know if you have more info, thank you very much !
Old 12 hours ago
  #30
Gear Head
 
jgale's Avatar
 

Quote:
Originally Posted by stevegalante View Post
Hi John, so I bought an FC7 + splitter, but I can't get it to work...
tried both pedals, swapped the two mono jacks on both...
Do you remember which parameters on the midiboard you have to set ?
I believe it's 19 and 20, but to which destination ?
Let me know if you have more info, thank you very much !
I just checked my setup. It is param 19 for pedal 1 and param 20 for pedal 2.

Are you using a midi monitor like midiox to check if anything is being sent? The Midiboard CCs are off by 1 - so if you want modulation (CC 1) sent, you need to set param 19 to 2 for pedal one.

Also, I confirmed - I used a FC7 pedal (it is stereo) to a left / right mono splitter.
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