I used the RCA CDP1802 processor manual (a fairly technical manual designed as a reference, not a tutorial) and got the thing working in about 2 months.
For those who know what the CDP1802 is and are disappointed that there is nothing of real value here, please just hold on a bit.
While I don't plan on making anything like an exhaustive website/reference for the CDP1802, I do plan to colllect a a number of links and offer at least a common jumping off point for folks interested in the CDP1802 or just fondly remembering their earlier computers.
If you're trying to get here, click here for directions
You may be wondering what the heck CDP1802 means anyway.
Or you may have run afoul of a search engine, know exactly what CDP1802 means and are a little cheesed that this page doesn't seem to be anything about it.
These units are placed by the side of the road to log traffic flow.
This is used for a Shape-meter design, to measure the deflection of 24 rotor sections caused by the stress profile of sheet steel as it is being milled.
Hardware and software design.The original portable design using CDP1802 microForth, was developed by Howerd Oakford as an employee of Sinar Technology / Rofin Ltd from 1978 onwards.
Minor Experiments in Electronics by Dave(Site not responding. Last check: )
It was static and could be clocked at super slow speeds so one could actually whip out the logic probe and poke around for whatever the problem might be.
Development with the PIC seems light years ahead of the CDP1802, mostly because of the software tools available for it.
Never mind the obvious fact that the CDP1802 predates the PIC series by a few decades, but it also helps that the PIC is still in production.
The Cosmac "ELF" was a simple-to-build hobby microcomputer produced in the mid-70's that was designed to be expandable and adaptable to new applications.
It was based on the RCA CDP1802COSMAC microprocessor chip that sold for less than $30.
The chip could use any combination of standard RAM and ROM devices and could address up to 65Kb of memory.
It seems like it was actually a really advanced design for it's time, though it wasn't very fast.
I don't think it was ever terribly successful, although it was used in the Voyager space probe, so we can reasonably say the CDP1802 has been taken "farther" (in the literal sense) than any other processor!
Unlike the Altair, the Elf was a computer that everybody could afford, including, at that time, a poor high school student like me. A lot of people, including me, built a COSMAC Elf as their first computer and still have fond memories of toggling in little programs with the front panel switches.
The good news about the COSMAC Elf was that the CDP1802 had a built in "loader" mode that allowed you to toggle in programs directly from the front panel with only eight switches and virtually no extra hardware.
A VCC low voltage monitor in the Elf 2000 ensures that the CPU is reset on power up and power down regardless of the switch settings.
The RCA CDP1802COSMAC microprocessor is a one-chip CMOS8-bit register-oriented central processing unit introduced in 1976.
Although the 1802 is now almost 30 years old, it continues to prove itself in many industrial and commercial applications.
The new RCA COSMAC Microtutor II, preassembled and containing its own regulated power supply, is based on the RCA CDP1802CMOS8-bit microprocessor and supersedes the original Microtutor CDP18S011.
, while vacationing in hotel Teuta in Risan, was reading the application handbook for the RCA CDP1802 CPU and stumbled upon CPU-assisted video generation.
Since the CDP1802 was very primitive, he decided that a Zilog Z80 processor could perform the task as well.
Before he returned home to Belgrade, he already had the conceptual diagrams of a computer that used software to generate a video picture.
This meant that, regardless of interest, only a relative minority of people owned one - mostly ZX Spectrum or Commodore 64.
According to his own words, some time in 1983, Voja Antonic, while vacationing in hotel Teuta in Risan he was reading the application handbook for CDP1802 CPU and stumbled upon CPU-assisted video generation.
Since CDP1802 was very primitive, he decided that Z80 can do it as well.
Elf99 - Rebirth of a classic(Site not responding. Last check: )
The Elf99 project has grown out of a series of discussions on the ClassicCmp mailing list.
The overt goal is to build a single-board CDP1802 computer resorting modern components only when necessary.
The most notable changes from the Quest Elf design of 1977 is the use of a single CMOS 8-bit-wide SRAM and a modern EPROM in place of the dual CDP1822's and optional 82S123 bipolar PROM.
We always keep an eye on the efficiency of programming, thereby reducing the hardware performance requirements to a minimum.
This approach is based on early experiences where the company founder had been involved in CNC machine control programming based on a CMOS micro-controller (CDP1802COSMAC) running at 1.0 MHz used to control the diamond grinding of hardened materials for the automotive industry.
Today, we are looking at several thousands of DSP-MIPS allowing us to make the impossible real.
Mostly writing C++, but writing a lot of Perl tools that are used in an automated build system based around Visual Build Professional (Very highly recommended btw!).
Have used SC/MP, RCA COSMAC (CDP1802), Z80, 8051, 6800 and 6502 assembler, Forth, Basic (many flavours), Logo, SmallTalk, Pascal, Algol 60, Fortran, C, C++, VBA, JScript and Perl.
Started using Perl in May 2005 and joined PerlMonks at the end of May.
www.perlmonks.org /?node_id=461912 (341 words)
CD-R from FOLDOC(Site not responding. Last check: )
GLS recalls, for example, a programming project in which strings were represented as linked lists; the get-character and skip-character operations were of course called CHAR and CHDR.
