[sdiy] just when you think DIY spirit is fading out

[Ben Bradley]

I see several of these emulate known processors, and apparently others
(I haven't looked closely) use their own instruction set. I recall a
short mention, probably in Byte Magazine's first 20 years, of someone
designing and making their own CPU.

As for recreating previous processors, Here are two noteworthy
efforts. First is the Monster 6502 using discrete FETs in apparently
the same configuration as the original chip. It has some extras to
drive LEDs and such, but due to its size and apparent trace
capacitance, it's limited to a max clock speed of 50kHz.
https://monster6502.com/

On the other hand, here's a small 40-pin-replacement board for the
6502 using an FPGA that runs at 100MHz:
http://www.e-basteln.de/computing/65f02/65f02/

I've got a 6502 simulator program that runs on my modern laptop at
around 100MHz. I got the C source online somewhere, I forget, but I
recall finding several sources. Doing something like this is just
another of the many projects I'd like to do "someday."

On Tue, Oct 19, 2021 at 10:20 AM Roman Sowa <modular at go2.pl> wrote:
>
> While reading some blog update I have clicked one link too far and saw this:
>
> https://www.homebrewcpuring.org/
>
> There's nearly 80 websites devoted to CPUs home built from anything but
> CPU chip. Behind every website there's a sick person, who came up with
> crazy idea of making a computer with TTL chips, transistors, or relays.
> If you don't know yet what to do with the rest of your life, this is
> cool hobby that will take all your time and money.
> Even browsing all those websites might take weeks. Some of them provide
> all the info so you can build it yourself.
>
> Just when I thought rarely anyone does bare bones DIY anymore, because
> there's so much of arduino or internet copy/paste or aliexpress, I found
> this.
> It's like 2nd level of geekyness. They are the ones called "weirdo" at
> geeks convention. Love it.
>
> Roman
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