I own one of these which I use in a 386 machine I'm going to dig out this weekend during my wild photo shoot for the retro rig photo thread we have going here.
How can I help?

Well, I'm mainly looking for two things... the first is, whether the trace connecting the two pins at position 0 of the address selection exists on other cards... basically, if you could prod those pins on your card with a multimeter, and see if there's continuity between them without a jumper installed there. I think that trace probably needs to be cut on mine, but I want to make sure before I do it.

Second, would be a verification if the information I found about the jumper settings is correct, that putting jumpers at positions 2 and 3 on the address selection is actually the correct setting for the 330h address. That's something I could find out by trial-and-error, I suppose, but rather than installing full pin headers I'm planning on just soldering in a couple little wire bridges at the necessary positions, so knowing exactly where I need to install those bridges would save me some trouble.

Just plug it in and figure out where the I/O is located before you go through that hassle?

Try "Gateway" from Legend Entertainment. If it works, you have a 100% compatible MPU401 card...

Mau1wurf1977 wrote:

Try "Gateway" from Legend Entertainment. If it works, you have a 100% compatible MPU401 card...

I can confirm it's 100% compatible with the Roland MPU-401 spec

Old Thrashbarg wrote:

Well, I'm mainly looking for two things... the first is, whether the trace connecting the two pins at position 0 of the address selection exists on other cards... basically, if you could prod those pins on your card with a multimeter, and see if there's continuity between them without a jumper installed there. I think that trace probably needs to be cut on mine, but I want to make sure before I do it.

Second, would be a verification if the information I found about the jumper settings is correct, that putting jumpers at positions 2 and 3 on the address selection is actually the correct setting for the 330h address. That's something I could find out by trial-and-error, I suppose, but rather than installing full pin headers I'm planning on just soldering in a couple little wire bridges at the necessary positions, so knowing exactly where I need to install those bridges would save me some trouble.

Hopefully I can answer this shortly, just got back from a 4 km "morning walk"

Old Thrashbarg wrote:

Well, I'm mainly looking for two things... the first is, whether the trace connecting the two pins at position 0 of the address selection exists on other cards... basically, if you could prod those pins on your card with a multimeter, and see if there's continuity between them without a jumper installed there. I think that trace probably needs to be cut on mine, but I want to make sure before I do it.

Second, would be a verification if the information I found about the jumper settings is correct, that putting jumpers at positions 2 and 3 on the address selection is actually the correct setting for the 330h address. That's something I could find out by trial-and-error, I suppose, but rather than installing full pin headers I'm planning on just soldering in a couple little wire bridges at the necessary positions, so knowing exactly where I need to install those bridges would save me some trouble.

Ok, just checked my card.

The pins at "0" gives no continuity
My card is set to port 330 and IRQ = Jumper on "0" and jumper on "2" at

my card

Huh, so I guess the documentation I found was wrong (thanks for nothing, usenet! 😒 ), and I don't actually need to change anything.

I guess I could've just plugged it in and found that out on my own, but not knowing the history of my particular card (and noting that there are some scratched traces and other slight damage to it), it's nice to have assurance of how it's supposed to work, so that I can easily tell whether it works at all.

So, thanks a bunch for your efforts, Amigaz, I do appreciate it. 😀

@Old Trashberg

np, have fun with your card 😀

Digging up an _OLD_ thread...

I found one of these CMS 401's for sale but, alas, from the pictures it looks like someone took all the chips out? (or most of them):

Does it look useless or is there hope? (no vultures please)[/img]

The important special chip is there, it should be possible to replace the others, they are not very uncommon.

Mouser (I am not familiar with component dealers overseas, this is the first I thought of) should have everything except the SRAM. It is available at Ebay (you can even look for a HM6116 or others instead).

On the other side there may be a reason why it was cannibalized...

Seems more trouble than it is worth for 50 bucks initial investment.

You are also missing the address and the IRQ jumpers..

They may be hardwired

first post, so hello to everybody 😀

i have this card but missing cables for it 🙁
can somebody send me picture of inside of db25 connector?
in order to build my own cable i need to know if there are any parts inside this connector and which pins are connected to midi out

A CMS 401 card for sale here with $25 buy-out:
http://www.ebay.com/itm/Roland-CMS-401-Interf … =item416cc849ff

I bought a Midiman MM-401 card from the same seller, so thought this might be interesting for some in here who are looking for a intelligent mode compatible MPU-401 card.

I also have a board that has no cable and it also doesn't get detected.
Any chance to get the pinout of the cable?

cricket wrote on 2020-06-24, 19:59:

I also have a board that has no cable and it also doesn't get detected.
Any chance to get the pinout of the cable?

I've got one of these cards on the way... One of the few MPU-401 clones I didn't already have. I'll post the pinout once it arrives