[sdiy] Who apart from me things the whole MIDI board needs replacing ?

Mike Bryant mbryant at futurehorizons.com
Mon Jan 24 15:00:32 CET 2022

Reminded me of this paragragh in the Raspberry Pi RP2040 datasheet :-)

"I2C is an ubiquitous serial bus first described in the Dead Sea Scrolls, and later used by Philips Semiconductor. Two wires with pullup resistors form an open-drain bus, and multiple agents address and signal one another over this bus by driving the bus lines low, or releasing them to be pulled high."

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Matthew Skala via Synth-diy
Sent: 24 January 2022 12:50
To: jslee via Synth-diy
Subject: Re: [sdiy] Who apart from me things the whole MIDI board needs replacing ?

On Mon, 24 Jan 2022, jslee via Synth-diy wrote:
> IP — the published, documented IP version 4 protocol that we still use today — predates MIDI slightly. The guts have remained the same and, as far as I’m aware, compatible. Though various options and extensions have been added, and since ~1996 we’ve also had IPv6.
> Ethernet was also commercially available in 1980, though not an IEEE 
> standard until slightly later
> Still, that certainly leaves MIDI in some rare and distinguished company.

If we're playing this game, the basic electrical standard for landline telephone service dates from the 1870s.  Pulse dialling is from the 1890s and I think many networks can still accept the pulse dialling signals of that era, even if the numbering schemes have changed and DTMF introduced in the 1960s is now preferred.  I still use a DTMF phone plugged into a cable modem; the cable modem does not do a good job of following the standard (insufficient ring voltage - I had to build a booster) but my phone, manufactured in the 2010s, would've worked on at least a 1970s-era North American network, and except for dialling might have worked on at least some 1890s-era networks.  Of course, part of the secret to that is just the wide tolerances - both the phones and networks are designed to accept a lot of variation in the things they connect to.

I think there are also some very longstanding standards in electrical power (voltages both in the home and for transmission lines; AC frequencies; phase arrangment; plug designs); but a little poking through Wikipedia suggests that those things have not remained unchanged or backward compatible quite as long as the telephone, with their current forms in North America mostly appearing in the early 20th Century. They're still in flux in some other places.

Matthew Skala
North Coast Synthesis Ltd.
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