[sdiy] Art of electronics computer

[Harry Bissell]

1802 ?  are you planning some rad-hard sequencer or something ?"   :^)

(for those not in the know, the 1802 has superior performance in radiation environments due to the
forgiving nature of its CMOS process and large (gigantic, by today's standards) geometry.

Perhaps the last things on earth will be a dead flower and a live cockroach, jamming to your 1802 beat box...

H^) harry



----- Original Message -----
From: Tim Daugard <daugard at cox.net>
To: Dan Snazelle <subjectivity at hotmail.com>
Cc: synthdiy diy <synth-diy at dropmix.xs4all.nl>
Sent: Mon, 09 Jan 2012 09:43:35 -0500 (EST)
Subject: Re: [sdiy] Art of electronics computer

From: "Dan Snazelle" <subjectivity at hotmail.com>

> Anyone here built this computer OR similar to learn about computers,logic, 
> memory, etc???

I built a full computer using an 1802 processor chip and the RCA manual for 
the chip. I had a one year remote tour of duty in Iceland. I decided I would 
build some of the things I had stacked up. I had the popular electronics 
articles also, but I don't think they were much help.

I used a Radio Shack 44 pin edge connector proto board for the processor 
circuit. Another matching proto board for the memory. I have a third board 
with an old hex + 4 button circuit a built for a previos computer that I 
still have to adapt. The final board was a non-edge connector board for the 
front panel DMA programming, Display and control circuitry.

> I am considering learning about logic , memory, and computers by following 
> along with the labs in the art of electronics student handbook.
> They have full schematics and most parts i know where to get.

Building a computer will definitely improve logic skills. Build a computer 
with a random selection of logic chips picked up in a bag full at a hamfest 
will REALY make you figure out ways to implement logic. (First project in 
Iceland was sorting, identifying and testing maybe a hundred logic ICs. I 
still have about 10 left that I never figured out.

> However, there are some parts which seem hard to find

Figure out what they do and figure out a subsistute logic.

My latest computer exploits entail learning:

http://www.ti.com/tool/msp-exp430g2

$4.30 for the entire programming kit directly from TI. It includes to 14 pin 
DIP Microprocessors. One of the projects for this chip is to create a boot 
loader for the 1802 computer. I'm currently working on a Mouser order so I 
can interface this 3v chip to the 5V logic of the 1802 system.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://members.cox.net/synthfred/h_toctop.htm (Fred's online edition)


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-- 
Harry Bissell & Nora Abdullah 4eva