cosmacelf : COSMAC ELF and 1802 Microcomputing

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The RCA CDP1802 microprocessor (also known as "COSMAC") was the basis for several hobbyist computers in the mid 70s and early 80s. Join this group to discuss these old computers or share your 1802 experiences.

Visit cosmacelf.com for more on the history of 1802 microcomputing, data sheets, articles, photos, and more. You can find various emulators of ELF computers at elf-emulation.com (Unix/Windows), TinyELF.com (Mac OS X), and in the Files area of this group. There's even a simulator in Javascript that will run right in your browser.

Please note that due to some abuses of this forum, initial posts by new members will not appear until approved by a moderator. We regret that the actions of a few spammers have resulted in this inconvenience to the community.

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Re: Is there an error in the ELF's Parts list? ... This was a long time ago so my recollection is vague at best but I believe that "KC" was a new aluminum case. It is non-magnetic and weighs ~7 grams. -- Posted - Tue Jun 18, 2013 2:30 am	David W. Schultz schultdw Send Email
Re: Is there an error in the ELF's Parts list? ... "C" often means "commercial" grade, i.e. a 0-70 deg.C part. So KC is a TO-3 case, 0-70 deg.C operating temperature range. -- There ain't no rules around Posted - Tue Jun 18, 2013 2:04 am	Lee Hart leealanhart Send Email
Re: Is there an error in the ELF's Parts list? ... KC? Never seen one. Interesting though. There must be some meaning to it, but what? ... Hmm, that's a very interesting comment. I added all kinds of Posted - Tue Jun 18, 2013 1:23 am	Josh Bensadon joshbensadon Send Email
Re: Is there an error in the ELF's Parts list? ... Just to add some more noise to this I dug a TO-3 LM309KC out of the parts bin and it has the squiggles that indicate it was made by National Semiconductor. Posted - Tue Jun 18, 2013 12:34 am	David W. Schultz schultdw Send Email
Re: Is there an error in the ELF's Parts list? This gets even more interesting. When I opened up my National Semiconductor Voltage Regulator Manual from 1978, the final page of the LM309 datasheet has an Posted - Thu Jun 13, 2013 8:44 pm	Mark Graybill atari7800mod Send Email
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