[sdiy] DCB Spec

[Mattsson Per]

These are scans from the J60 SM:
http://www.permattsson.se/electronics/DCB/



Skickat från min iPhone

30 apr. 2017 kl. 03:49 skrev Adam Inglis <21pointy at tpg.com.au<mailto:21pointy at tpg.com.au>>:

Hi Grant
actually, I’ve just checked and the doc I have has exactly the same text and diagrams as that found in the Juno 60 SM, starting on page 17, regarding the DCB data format and spec.

Like you, I was of the understanding that DCB informed the midi spec to a large degree, but I know nothing about code etc, so I’d be interested in Brian’s assessment.

AI
On 30 Apr 2017, at 2:43 AM, MTG <grant at musictechnologiesgroup.com<mailto:grant at musictechnologiesgroup.com>> wrote:

Hi Adam,

Can you tell me the name or number of the doc? That way I can maybe search online for it first. I don't think I have a printed copy anymore.

GB

On 4/28/2017 6:51 PM, Adam Inglis wrote:
I have a printed copy of the DCB spec somewhere if you need it (I’m still using it for my JP-8).
Also there is some info in the service manual for the JSQ-60 sequencer, and if memory serves, the OP8-M add on for the MC-4.

AI
On 29 Apr 2017, at 1:44 AM, MTG <grant at musictechnologiesgroup.com<mailto:grant at musictechnologiesgroup.com>> wrote:

I see I have some homework then. This is from memory and there was a Roland document on DCB. I don't know if it was in the Service Notes for one of the synths or one of the PC interfaces (not sure why that would be , but...). I will try and find some info and see if my memory is correct or way off the mark. Anyway, thanks for pointing that stuff out. I'm sure it will be an interesting read.

GB

On 4/28/2017 1:43 AM, rsdio at audiobanshee.com<mailto:rsdio at audiobanshee.com> wrote:
Reading the Wikipedia page for Roland DCB, I do not see any resemblance to MIDI. Can you explain any way that they're similar, other than being 8-bit codes for keyboards? I'd be curious to see some details.

I was browsing the MIDI.org<http://MIDI.org> site recently, where they mentioned that the first proposal for MIDI was published at an AES convention. As an AES member, I was able to find the paper, and I must admit that I was surprised. The original MIDI proposal was a very different protocol from what we have today. It was more like other 8-bit protocols of the day.

However, modern MIDI has much more in common with the short-lived original proposal than anything I see in DCB.

My viewpoint may be skewed (jaded?) because I've seen so many 8-bit protocols over the decades, and have invented several of my own for commercial products for clients. When there is a communication need, it's not too difficult to invent a protocol, especially if you don't need it to last for very long or be compatible with more than a handful of products. Surprisingly, modern processors are still often limited to 8-bit serial links, even though a few processors can handle 24-bit and 32-bit serial protocols. In other words, I think you're giving far too much credit to Roland for DCB.

However, I do have a strong suspicion that the differences between the first MIDI proposal and the final 1.0 spec were due to the input of companies like Roland. Not that DCB was spliced onto MIDI 1.0, but that MIDI 1.0 was more like what Roland wished they had done, and was a result of several manufacturers learning curve from their own proprietary protocols.

Brian
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