fruit-bat

Fixed IN R, (C), IN (C). See https://github.com/fruit-bat/pico-zxspectrum/commit/11749a17140acebe3e562ee9547110bedc9b3cda

``` CCF+SCF SCF+CCF ``` Failing on XY flags, which is possibly errors in the tests. Anyone have a more recent build of the tests from https://github.com/raxoft/z80test ?

This may be of interest : http://www.zxdesign.info/cassette.shtml Might be fun to be able to load from a real audio source 🙂. The software side will be tricky. There are moments...

I'm not 100% sure but I think Vcc in their design is 5v... So we need to adjust R42 & R41 so that the gate bias is correct for 3.3v....

Hmm, also this circuit has no gain, which we may want a little of if I am right about the voltage range on the input pin... May need to give...

...Maybe the higher voltage is to able to drive headphones?

On the pico... "Normally the voltage threshold is about 1.8V, but it isn't guaranteed; it can be anywhere between the maximum input low and minimum input high, that is, between...

Could just try it with 39k for R42. Please correct my junior school maths if I have got it wrong. Centre voltage... (2.0v - 0.8v) / 2 + 0.8v =...

I hope you have a nice time with your family.

Thanks for those measurements. It looks like the voltage swing is not really big enough 🙁. It's a shame the adc doesn't work, it would be ideal for this. Maybe...