On 2015-06-30 20:55, didier derny wrote: >>> All the projects I found are using analog switch so I moved to this >>> solution I found 3 chips, this one is different >> I am not sure I understand this. Is your project going to use an >> analogue switch IC or not? I take "yes", judging by the following parts. > yes seems ok, several project use this solution or variation on this > solution I see. For a moment I thought that maybe you found a way to make it work reliably w/o the switches. Those chips are quite budget hungry. > I'm using bt module to avoid piercing hole in old cases That's what I like about it. I'd imagine (my favourite approach) a kind of riser board getting between the original kbd connectors and allowing wireless KBD for the old machines. I love this idea. > I want a very small slave board small enough to fit inside a C116 Would be great, of course. Even if you have for example separate the power supply unit to another small one (like if you need something else than 5V) it might still be a viable approach. >> I remember I looked at "Analog Devices" chip some time ago. I checked >> now and found: >> >> http://www.analog.com/media/en/technical-documentation/data-sheets/ADG2188.pdf >> >> seems to be still "current", small and available in quantities but the >> supply is either 12V or +/-5V, which incurs extra cost per board. But... > I'll check this one but I don't like the 12v The one you mentioned needs it too. > Once it is working correctly on several machine, if someone wants to > take the control of this project > and produce the board... I'll give all the détails (there is only one > condition, the goal of this project > is not to make money but to produce a board with a modern keyboard for > our old machines Well, one doesn't even make a living with those things today, let alone real money ;-) In any case, even if you offer the designs and ready-to-produce files/documentation, expect that there always will be some people who will try to "make money" by selling those on ebay or so. > where the original > keyboard is often faulty (I've never really been able to use my C116 due > to keyboard problems) I guess all C116s suffered the same fate. Their keyboards were probably worse than Sinclair's ones. > I've a small problem if I want to support the old pets the 8x8 is not > enough The family of chips I pointed you to has also 8x12 variant. That should cover up to 96 keys, I guess. -- SD! Message was sent through the cbm-hackers mailing listReceived on 2015-06-30 20:00:07
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