Free (old!) micro-processor

[Dan Romanchik KB6NU]

My last semester in college (September 1978), I designed a little computer board using this processor. Somehow, my professor had gotten hold of one, and that's the part we used instead of the 8080 or 6502. I remember it being a pretty cool device to play around with.

73!

Dan KB6NU
----------------------------------------------------------
CW Geek, Ham Radio Instructor
Station Manager, WA2HOM at the Hands-On Museum (www.wa2hom.org)
Read my ham radio blog at http://www.kb6nu.com


On Mar 29, 2013, at Mar 29,3:17 PM, Gerald Wolczanski wrote:
> Sorting out some of my parts and I find a "CDP1802", a 40-pin device.
> Researching I find:
> 
> The RCA 1802 has a static CMOS design with no minimum clock frequency,
> so that it can be run at very low speeds and low power. It has an 8-bit
> parallel bus with a bidirectional data bus and a multiplexed address bus
> (i.e., the high order byte of the 16-bit address and the low order byte
> of the address take turns in using the 8-bit physical address bus lines,
> by accessing the bus lines in different clock cycles).
> 
> The RCA 1802 has a single bit, programmable output port, and four input
> pins which are directly tested by branch instructions.
> 
> Its I/O mode is flexible and programmable, and it has a single-phase
> clock with an on-chip oscillator. Its register set consists of sixteen
> 16-bit registers. The program counter (PC) can reside in any of these,
> providing a simple way to implement multiple PCs, pointers, or
> registers.
> 
> MORE IMPORTANTLY:
> The Galileo spacecraft used multiple 1802 microprocessors
> 
> ANYBODY WANT THIS?  
> 
> Jerry
> KI4IO
> Warrenton