New Relay Computer

[Joseph H Allen]

I've made a new relay computer: check out http://relaysbc.sourceforge.net
(look for the videos on the example programs page).

This one is a single board computer, like the microprocessor trainers of the
70s and 80s.

A trick to keep the relay count very low is my design for a master-slave
flip-flop. By using a capacitor for the master side and a holding resistor
based latch for the slave side, only 1.5 relays per bit are needed.

--
/* jha...@world.std.com AB1GO */ /* Joseph H. Allen */
int a[1817];main(z,p,q,r){for(p=80;q+p-80;p-=2*a[p])for(z=9;z--;)q=3&(r=time(0)
+r*57)/7,q=q?q-1?q-2?1-p%79?-1:0:p%79-77?1:0:p<1659?79:0:p>158?-79:0,q?!a[p+q*2
]?a[p+=a[p+=q]=q]=q:0:0;for(;q++-1817;)printf(q%79?"%c":"%c\n"," #"[!a[q-1]]);}

[barry...@yahoo.com]

On Thursday, July 25, 2013 8:07:06 AM UTC-7, Joseph H Allen wrote:
> I've made a new relay computer: check out http://relaysbc.sourceforge.net
>

Nice looking apparatus, and it sounds cool too! Are those automotive-style 12 VDC relays? They look expensive. I found myself almost immediately wondering what it would look and sound like with miniature reed relays. Probably like a fifteen-year-old hard disk during a de-frag!

Maybe something like these? They don't look awfully expensive.

http://www.mouser.com/ds/2/89/8L-7572.pdf

Mike

[Joseph H Allen]

In article <b611640d-7f0e-4a76...@googlegroups.com>,

Well I would want DPDT relays.. I had thought there was no such a thing for
reed relays, but they seem to exist:
http://www.mouser.com/ds/2/357/105A_172DIP-4841.pdf

but very expensive..

Anyway I used conventional DIP DPDT relays, like G5V-2-DC12:
http://www.mouser.com/ds/2/307/G5V-2_0911-11924.pdf

I've seen various brands of these as low as $0.65 USD each, but I've
discovered that the quality certainly goes down with the cheap ones: 3 / 83
broken (didn't switch on completely). You can see on my pictures that some
of the orange ones have been replaced with back ones.