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cosmacelf · COSMAC ELF and 1802 Microcomputing

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Group Information

  • Members: 768
  • Category: Computers
  • Founded: Dec 30, 2001
  • Language: English
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Description

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.

Most Recent Messages

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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
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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
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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
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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
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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
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2013 290 368 646 510 312 54
2012 608 417 245 121 140 215 485 310 151 45 250 305
2011 38 157 69 70 86 103 80 126 84 153 213 237
2010 177 85 99 143 103 35 115 58 51 19 38 33
2009 37 31 98 52 10 9 7 34 32 129 62 46
2008 10 1 20 13 30 40 35 54 23 51 29 10
2007 65 30 35 13 49 30 24 20 15 50 8 6
2006 84 67 240 40 60 13 29 39 10 33 73 131
2005 332 319 152 92 126 134 31 44 86 114 70 32
2004 101 46 103 102 61 64 72 44 87 71 102 122
2003 103 171 72 21 27 109 157 125 118 84 70 163
2002 16 12 15 44 48 9 64 83 59 84 38 70
2001 2

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