Re: Joysticks typical polling freq.

From: Mia Magnusson <mia_at_plea.se>
Date: Fri, 13 Dec 2019 16:11:37 +0100
Message-ID: <20191213161137.00007fcc_at_plea.se>
Den Fri, 13 Dec 2019 09:00:22 -0600 skrev brain_at_jbrain.com:
> I can’t add much more than a hat has all eddy been stated but I will
> put in this note for paddles, if someone later searches for this.
> The paddles use 512 cycles to take a reading so there will be
> absolutely no benefit to reading more than once every 512 cycles.  I
> agree that’s far too often but just noting the paddle hardware does
> have an upper bound.

Interesting!

My faint memory from trying something as foolish as feeding analogue
audio (at least via resistors) to the paddle input on my VIC 20 and
just copy (with the appropriate shifting) the paddle value to the
volume register in assembler, is that it seemed to take about four
raster lines to do a conversion. So maybe the conversion is about ten
times faster in the SID in the C64 than the VIC-1 in the VIC 20.


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Received on 2020-05-29 23:54:38

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