Re: reading vic20 or c64 column

From: didier derny <>
Date: Tue, 30 Jun 2015 20:55:16 +0200
Message-ID: <>
On 30/06/2015 18:46, wrote:
>> On 2015-06-30, at 17:22, 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 

>> my goal is not to reinvent the wheel but to use my usual keyboard with my old machines
>> and avoid piecing holes in an old case to insert an usb connector
> Good. The one I have (somewhere) is still using the AT/PS/2 protocol and connectors. I'd prefer USB and even more a BT one. Although the latter still remain substantially less reliable, especially in a (electromagnetically) noisy environment.
I'm using bt module to avoid piercing hole in old cases
I want a very small slave board small enough to fit inside  a C116
>> actually I'm looking for something more recent than the 8808ae but difficult to find 8x8  matrix DIL or PLCC
> I remember I looked at "Analog Devices" chip some time ago. I checked now and found:
> 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
>> I'm not planning to produce a product but make the resources available
>> PCB from oshpark   arduino mini + hc05 from china (ebay) really cheap  (mt8808ae from utsource) (if I dont find a smaller chip)
> ... this one needs 12V 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 where the original
keyboard is often faulty (I've never really been able to use my C116 due 
to keyboard problems)

I've a small problem if I want to support the old pets the 8x8 is not enough
in fact many machines are using the same technique and the difference is 
only the connector
>> windows application available from a web site (with the source code)
> What kind of windows application? Controlling the switch? In place of a uC?
Old style application :)  the code compiles with pelles C and win32
should work on windows 95 :)
>> (later standalone controller based on vinculum II)
> Seems like a good choice.
I've tested usb chips for month when I discovered the Vinculum II
I tried some pic, a nightmare, max3421e  with arduino software  too heavy...
the vinculum has everything inside :)

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Received on 2015-06-30 19:00:06

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