It is a large scale integration lsi microprocessor p chip that is implemented using socalled cosmac complementary symmetry monolithic array computer architecture. Cosmac elf popular electronics pdf the cosmac elf was a microcomputer design by joseph weisbecker that was announced in the pages of the august edition of popular electronics. Vintage cosmac elf is pretty close to original hackaday. Although our simuemulator above is very popular, our cosmac flea microtrainer is the flagship product of our line. Netronics elf ii restoration i am a collector of all things cosmac so when i saw this netronics elf ii system appear on ebay, i decided to give it a shot and try to win it. Konwencja cmr pdf the convention on the contract of international carriage of goods by road cmr and protocol of signature, done at geneva 19 may r. As you know, the propeller elf ii is a work in progress, com ing. The system was a very early singleboard personal computer. The super elf has the ability to step through programs one machine cycle at a time. It has flexible programmed io and programinterrupt modes. Popular electronics was famous for the article introducing the altair 8800 back in 1975 well, the cover date was 1975. For many of us, it was the rca 1802 thanks to the cosmac elf articles that ran in popular electronics. Some files for cosmac elf self build simple computer based on 1976 article in popular electronics based on cdp1802 cpu. Btw, theres a very small update on the propeller elf ii ready for posting.
At this point the cpu is in the process of executing the current instruction cycle. The cosmac elf was an rca 1802 microprocessorbased computer described in a series of construction articles in popular electronics magazine in 1976 and 1977. The 1802 microprocessor was originally known as the rca cdp1802. Through the back pages of electronics magazines, both netronics and quest electronics offered lowpriced, enhanced kits that were based on this design.
I was looking at some of the old magazines from the 1924 days. That was so popular no pun intended, that they ran more computer construction articles, including the swtpc 680 late in 1975. Build the cosmac elf a lowcost experimenters microcomputer. The instruction set timing diagrams in appendix b should be consulted to determine the hardware. I am just beginning this project so there is currently not too much here. It was operated without builtin roms and programs were entered directly with help of the cpu integrated dma using 8 toggle switch. Continue reading vintage cosmac elf is pretty close to original posted in microcontrollers tagged 1802, cdp1802, cosmac, cosmac elf, elf, popular electronics, rca 1802, retrocomputing. Popular electronics 19541982 available as pdf downloads. The person listing it had no way to test it, so it was a gamble whether it was complete and working or not. Execution is halted at the negative edge of the tpa signal in each machine cycle. The chip can use any combination of standard ram and rom devices and can address up to 65,536 65 k bytes of memory. We featured the online archive of the entire popular electronics collection, but hit up page 33 of this pdf if you want to jump right to the article that started it all.