QL upgrade versus Q68

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Dave
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Re: QL upgrade versus Q68

Postby Dave » Tue Oct 10, 2017 7:13 pm

Don't bring me into this!

I am currently working with someone on a general purpose PIC that can use any HID USB mound and keyboard and convert them to differential mouse and 8 pin byte of keypress plus shift/tab/alt/etc for general purpose use on embedded designs... They're a retro Commodore person, so it will be mainly aimed at that first.


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Peter
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Re: QL upgrade versus Q68

Postby Peter » Wed Oct 11, 2017 8:45 am

Dave wrote:I am currently working with someone on a general purpose PIC that can use any HID USB mound and keyboard and convert them to differential mouse and 8 pin byte of keypress plus shift/tab/alt/etc for general purpose use on embedded designs... They're a retro Commodore person, so it will be mainly aimed at that first.


That would be (apart from using USB instead of PS/2) the opposite direction. What is needed here, is matrix keyboard to PS/2 (or something else the Q68 can easily use).


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Derek_Stewart
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Re: QL upgrade versus Q68

Postby Derek_Stewart » Wed Oct 11, 2017 10:07 am

vanpeebles wrote:


Much want!! :ugeek:


Hi,

I like the case, maybe not that screen size.

But a more important question would be: Who would design such a case?

And would everyone want to pay for the development cost?


Regards,

Derek
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XorA
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Re: QL upgrade versus Q68

Postby XorA » Wed Oct 11, 2017 10:35 am

http://www.ti.com/product/tca9539-q1/datasheet

Is the sort of chip I was meaning, you would basically scan the keyboard matrix VIA I2C and let a native driver sort out the keymap.


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Peter
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Re: QL upgrade versus Q68

Postby Peter » Wed Oct 11, 2017 12:32 pm

Looks like a suitable chip, 3.3V supply but 5V tolerant. It can easily be configured to have 8 outputs and 8 inputs.
It would allow the Q68 to remain I2C master, no hardware change there. The only issue would be the driver.
A QL-side board would only require this cheap chip, 8 diodes, 10 resistors, 2 capacitors and the connectors.

Are the QL keyboard connectors still available?

The advantage of using a keyboard converter would be that the QL mainboard can be removed, so the whole thing would have very low power consumption.
On the other hand, removing the QL mainboard makes it harder to re-convert to original state.


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Cristian
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Re: QL upgrade versus Q68

Postby Cristian » Wed Oct 11, 2017 11:30 pm

Derek_Stewart wrote:


But a more important question would be: Who would design such a case?

And would everyone want to pay for the development cost?

Well, the visual concepts sometimes become real, sometimes die. And yes, your questions are crucial. The answers depend on several factors: for example, maybe it could be possible to modify an existing case, or maybe we could consider a modus operandi similar to the ZX Spectrum Next one. Of course from different choices come different costs and results.



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