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

[Michael E Caloroso]

My emphasis in college was digital electronics & microprocessors.  We built
(not designed) a discrete cpu (TTL) for one of the classes.  I built mine
from wire-wrap, which worked at first power up.  I remember that it was 8
bit, not much of an interface and no I/O to the outside world.  Power down
and your code was gone.

It was scavenged for parts a long time ago.

It was a neat project, and that knowledge has served me well in my career.

MC

On Tue, Oct 19, 2021 at 7:54 PM Ben Bradley via Synth-diy <
synth-diy at synth-diy.org> wrote:

> 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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