First EPROM Erasable Programmable Read Only Memory 1702

[lcfgroup]

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]

@jimklay Not sure which machines you are referring to ? The EPROM stores bits as a charge or no charge in a solid state integrated capacitor on the chip. It can be read- erased with this chip by shinning Uv light thought the window on the chip and then you can write data into the location again. The chip will hold data for 10 to 20 years - I am not sure this number is correct but it stores the information a long time but not for ever. The chip are random access type --- hope this helps -

[lcfgroup]

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

[ChessPieceRook]

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.

[lcfgroup]

@ChessPieceRook Good point - could have been better done - byte is much better than 8 bit word - Thank you - Dave

[ChessPieceRook]

@lcfgroup

No prob. :)

If you ever need help with misc. computer terms, i'm here for you. ^^

[29riteshkakkar]

nice work....................

[madamerotten]

I hope you get the museum up and running! I'd like to see some 2N404s on display!

[lcfgroup]

@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

[douro20]

@lcfgroup

The 2N404 is a germanium PNP transistor- the first transistor widely used in computers.

[ChessPieceRook]

@lcfgroup

I think the 2N404, is a germen transistor......i'm not 100% sure though.

[nexus1g]

I really liked this video. Very informative. I like how you actually have a chip to demonstrate. Remember the difference between Kb and KB; the lower case "b" is bit, but the capital "B" is byte. That was awesome seeing the close-up of the chip. I never heard about erasing EPROMs using UV light. That's awesome.

[lcfgroup]

Thanks for the info- I did not think of B and b in that way but it makes sense. I will remember this for the future, I just posted a new video about the MITTS 480 microcomputer - You may like it --it has one 1702 EPROM in it.

[raise4fun]

David this is very interesting and informative. Your videos are getting a lot better and your voice is great. I really enjoyed this clip. I would love a pair of those eprom ear rings as a gift for my wife. Where can I get them?

[lcfgroup]

Thank You Luis: I have lots of simular type ideas I can do tor the LCF School. Only need the time to do them . I will try to do 2 or so a week. DL