Q68 Expansion Card

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Derek_Stewart
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Q68 Expansion Card

Post by Derek_Stewart »

Hi,

It is said in another thread, that a larger case for the Q68 could allow the addition of expansion cards for the Q68.

What type of expansion would everyone want?


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Derek
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Pr0f
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Re: Q68 Expansion Card

Post by Pr0f »

I can think of a few things that mostly just involve some signal conditioning:

QL Network ports
I2C buffered/isolated outputs to protect the Q68 from unintended accidents by experimenters
Another Serial port - perhaps as RS422/3 - as there are some interesting things that can be plugged into this


Derek_Stewart
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Re: Q68 Expansion Card

Post by Derek_Stewart »

:o
Pr0f wrote:I can think of a few things that mostly just involve some signal conditioning:

QL Network ports
I2C buffered/isolated outputs to protect the Q68 from unintended accidents by experimenters
Another Serial port - perhaps as RS422/3 - as there are some interesting things that can be plugged into this
The QL Network and I2C sockets were going to added.

By I2C buffered/isolated outputs, do you mean a diode in each line?

I will look at the RS422 serial port, but who writes the SER driver?


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Derek
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Pr0f
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Re: Q68 Expansion Card

Post by Pr0f »

For the I2C buffering - I was thinking of some of the purpose made I2C buffer chips - since the current I2C lines are straight from the FPGA, putting some dedicated and purpose designed buffer chips in place seems like a good move if these lines make an appearance on the outside of the case...

TI have a number of chips, as to several other manufacturers - TI's range:

https://www.ti.com/interface/i2c/level- ... ducts.html

These go well beyond what a Diode or Tranzorb could offer


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