<div dir="ltr"><div>It is a weird choice of hill to die on.</div><div><br></div>8051 and Z80 are both 40+ years old and very much alive in 2020. PIC and AVR families are, according to Wikipedia, 20+ years old, with PIC's origins being much older.<br><div><div><div><br></div><div>And really the requirement when replacing a microcontroller isn't that the replacement is identical; the requirement is that it operates identically. Sonic Potions' TB-303 CPU replacement, for instance.<br></div><div><br></div><div>OTOH I started playing with modular synthesizers because I was spending too much time staring at screens. So I can understand not wanting to spend hours programming things.<br></div><div><br></div><div>John<br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 13 Oct 2020 at 22:23, Gordonjcp <<a href="mailto:gordonjcp@gjcp.net">gordonjcp@gjcp.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Tue, Oct 13, 2020 at 12:19:29PM +0100, Gerry Murray wrote:<br>
> One major advantage that David Dixon has in his designs is that in 20 years<br>
> time, someone plugs it in and it doesn't work, everything that makes it do<br>
> it's job is right there in plain sight and could be repaired.<br>
> Take any uProcessor driven design. In 20 years, plug it in and if it doesn't<br>
> work., it's for the trash.<br>
<br>
I mean, I'm currently repairing 40-year-old microcontroller based stuff that wasn't exactly spiffy new tech when I was in primary school, but okay.<br>
<br>
> So David is making something that has far greater longevity than , for<br>
> example, my precious midi message handler embedded in a Microchip 18F<br>
> microcontroller.<br>
<br>
Assuming you can get the chips, or anything remotely like them. Look at how many logic IC are simply no longer available with no reasonable replacement, like 16-to-4 encoders.<br>
<br>
-- <br>
Gordonjcp<br>
<br>
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