EPROM http://www.floydfolks.org & http://www.littlefamilyfarm.com 1-540-808-2880 - floydlcfgroup@gmail - PO box 179 Floyd,Virginia 24091
The EPROM was very important in the development of microcomputers because it gave the designer a way to load his custom program into non-volatile memory. LCF School LCFschoolThis program would always be ready to run at start up and not need to be loaded each time the computer was turned on.
An EPROM, or Erasable Programmable Read-Only Memory, is a type of memory chip that retains its data when its power supply is switched off. In other words, it is non-volatile. It is an array of floating-gate transistors individually programmed by an electronic device that supplies higher voltages than those normally used in digital circuits. Once programmed, an EPROM can be erased only by exposing it to strong ultraviolet light. That UV light usually has a wavelength of 253.7nm (for optimum erasure time) and belongs to the UVC range of UV light. EPROMs are easily recognizable by the transparent fused quartz window in the top of the package, through which the silicon chip can be seen, and which permits UV light during erasing.(From Wikipedia, the free encyclopedia)-----------------
Important Names & Words in the History of Microcomputers
Insai, Adam Osborne, bugbook, Ed Roberts, floppy disk, RAM chip, TRS-80, radio shack, commodore, Steve Jobs, Steve Wuzniack, WOZ, Atrai, Osborne, Adam Osborne, Heathzenith Clivesinclair, polymorphic, Ex8l, Heathkit, colleco, IBM PC, IBM PC jr., DEC, Don Lancaster, Wayne Green, teletype, Hewlett Packard, Jon Titus, Bill Gates, Apple, Microsoft, Steve Jobs, Steve Wozniak, Digital, museum, cyber, TI, IC, micro processor, Intel, logic, memory, USB, robotics, server, data, history, fiber optic, gateway, internet, texting, computer, Moores law, IBM, cyber engineer, automation, personal computer, PC, John Von Neumann, Thomas Watson, Intel 4004
This video was produced by the LCF Group, ( We are on The Crooked Road Heritage Music Trail and the Round The Mountain Artisan and Craftsman Venue as a great place to visit ) Floyd Professional Center, Village Green, Floyd Virginia. The LCF Group consist of David Larsen KK4WW, Gaynell Larsen KK4WWW and Dee Wallace KG4VMI. We are all radio amateurs and also are Directors of The Foundation for Amateur International Radio Service ( FAIRS) also located in Floyd Virginai. N4USA is the radio call for FAIRS and we have operated in Dominica as J79WW J79WWW J79VMI and many other countries. We are members of The Floyd Amateur Radio Society FARS. The LCF Group (1-540-745-2322) ham radio morse code cw amateurradio hamradio The following have activities in Floyd County, Virginia http://www.va-mountainland.com http://www.virginiamountainland.Com http://www.lcfarticles.com bugbooks http://www.bugbookcomputermuseum.com http://www.floydcountyvirginia.org http://www.fairs.org http://www.floydfolks.org and http://www.microcomputerhistorymuseum.com in Floyd Virginia. Www.floydvisitorcenter.com Www.visitfloydvirginia.org http://www.bugbookseries.com http://www.bugbookcomputermuseum.com http://www.bugbook-computer-museum.com http://www.bugbook.org http://www.bugbook.us http://www.bugbook.net http://www.bugbooks.info http://www.bugbooks.us http://www.floydcountyvirginia.org http://www.fairs.org http://www.floydfolks.org and http://www.microcomputerhistorymuseum... http://www.nationalmusic.us http://www.floydvirginia.org compass magazine log cabin Roanoke mountain home www.virtualblueridge.com blue ridge Parkway Destination Center www.floydtourismdirertory.com ,David Larsen Blacksburg, David Larsen Blacksburg Group, Blacksburg Group, http://floydcounty-va.com , http://floydcounty-virginia.com , http://www.floydcounty.info , Bugbook , http://bugbookcomputermuseum.com , http://floydcountyonline.org , http://floydcountyva.org , http://floydcountyvirginia.org , http://floydfolks.net , http://floydfolks.org , bugbook series http://www.stpierrewoodworking.com http://www.floydcountyvirginia.org Bill St Pierre Floyd Virginia http://www.nationalmusic.us
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We are in the Appalachian Music community of Floyd Virginia - I am also making a small museum display of some of my computers available to the public in the Village Green. We are on the "Blue Ridge Parkway" & " The Crooked Road - Virginia's Heritage Music Trail" . A lot of good things here - drop in and see us sometime. Also if you are biker this is a big stop over for riders on the Blue Ridge Parkway - Dave
lcfgroup 8 months ago
We have Apple 1 Microcomputers in LCF Group - you can see all 4 in our LCF Group collection at Mike Willegal's ' Apple 1 Registry ' - Folks ask how did you ever get 4 Apple 1's - short answer - I have been involved in teaching, using, collecting & writing about computers at Virginia Tech & other places for over 54 years - started at Remington Rand Univac company in 1967 - I have advertised in various trade magazines ' wanted pre1980 microcomputers for historical collection' for past 40 yrs
lcfgroup 9 months ago
isn't saying "8-bit words" like saying "most water"?
it's 256 bytes.
you can just say bytes.....no need to complicate things....caus' a word, or a byte, IS 8-bits.
ChessPieceRook 10 months ago
@ChessPieceRook Good point - could have been better done - byte is much better than 8 bit word - Thank you - Dave
lcfgroup 10 months ago
I hope you get the museum up and running! I'd like to see some 2N404s on display!
madamerotten 1 year ago
@madamerotten We are working on this -- we have thousands of items inventoried and now looking to get them in a museum data base. I am putting up a video on Byte Magazine in the next week or so. I don't remember -- what is the 2N404?
Thank you for the interest. DL
lcfgroup 1 year ago