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The Southsider

A blog by cd-w in General

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cd-w

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I'm still having fun writing text kernels. The latest version (attached) is an update to my 28char kernel to display multiple lines of text. This new kernel shows a 28x12 display without any restrictions. The kernel doesn't use any illegal opcodes, and there are still around 30 free cycles per-line, so it should be possible to display a few more lines of text with some work. Unfortunately, as before it has a 20Hz flicker, so it is essential to use the phosphor options under emulation. I'm still interested to know if the flicker is bearable on a real TV set?

 

Chris

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supercat

I don't think getting one extra column is worth the drop from 1/2 duty to 1/3 duty. Having 26 characters generated dynamically would be nice.

 

I've tried for 28 characters at 1/2 duty. It almost works, but I couldn't get get the letter spacing consistent. The 26-character approach is far more elegant.

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cd-w
I don't think getting one extra column is worth the drop from 1/2 duty to 1/3 duty. Having 26 characters generated dynamically would be nice.

 

I've tried for 28 characters at 1/2 duty. It almost works, but I couldn't get get the letter spacing consistent. The 26-character approach is far more elegant.

 

Yes, I think you are right - the flicker is much worse than I was hoping. Your 26-char approach definitely seems to be the way to go. I'm going to put this on hold for a while while I get back to Juno First.

 

Chris

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