Computer Memory is now 4,000,000,000,000 time larger then 49 years ago

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The Intel 1702A EPROM  (1971) has only 256 bytes of memory - today the USB Flash drive has 1 Terabyte of memory --- that is  an  incredible  4,000,000,000,000 times more memory.  This is a number so large I just can not sort it out in my mind. 

1000 GB or 1 Terabyte
Flash Drive. It would take
125.000,000,000 C2708 chips
to have this much memory!!!!

Moore's law seems to be working after 56 years. Gordon Moore made the observation and prediction in 1965 that the density of components on a silicon chip would double every 2 years. 

The USB Flash drive to the left has 1 Terabyte of memory.

That is 1000 Gigabytes.

It would take 125,000,000,000 of the Intel C-2708 Chips to equal this amount of memory.  A really big change in 56 years of technology.  This 1 Terabyte USB flash drive cost $39.00. 

Please note the Intel C-2708 has 125 times more memory than the Intel 1702 EPROM at the top of page. 

Help wanted 

 A project to make presentation displays for 
 2708 EPROM memory chips and a little history.

Intel C-2708 EPROM
memory chips.

I have 359 of these really nice Intel 2708 EPROM chips purchased in 1987. These chips are all nice white ceramic with gold pins and gold tops. They are part of my 45 years of collecting microcomputer memorabilia. 

What I want to do is make a presentation case/display for use as example of this early microcomputer and memory technology.  

Curious about EPROM memories - take a look here at a my blog post about the very first EPROM -  the Intel 1702A - Get an idea of  how and why they were used. "CLICK"

Intel C2708 EPROM 

A Smart display/presentation case is easily  possible.

A small Raspberry pie microcomputer can be included to provide many photos/videos and text that could be picked up on a smart phone using Bluetooth/WiFi connection. The unit could be connected to the internet with WiFi and linked to selected information on line about the history of microcomputers.

The use of these EPROMs is nice because the quartz window allowing a view of the IC chip. You should know the window was not put there for you to look into the IC - the window allows the memory to be erased by exposing the chip to UV light.

Photo of the 2708 EPROM
silicon chip that is viewed through
the quartz window on the IC.

It would be very nice to include a way to see into the window on the 2708 and get some idea what the actual silicon chip looks like. This could be a magnifying glass or maybe a photo of the chip would be best. Of course with the smart part of the presentation case just a view of the proper web site may be best way to obtain  more information.

Bottom side of 2708 EPROM
showing date code of 1977 &
made in Malaysia.

All my IC 2708 chips have a 1977 date code time of manufacture.

More information about EPROM memories - here is my video of the 1702 the very first EPROM chip. You will find this interesting. 

Summary of project:

To build and market a beautiful small  presentation case about microcomputer technology - most  likely out of wood that could be on the desk or appropriate space on the wall. The unit could be just a nice piece on the desk of those who have an interest in microcomputer history or are currently involved in the technology.  It would be a great conversation piece with the smart technology to bone up on the history of microelectronic technology and a real piece of history included - the Intel 2708 EPROM. 

Contact Information"CLICK"                                                              

David Larsen
 Blog Author

"by David Larsen"  Chantilly Farm owner, Computer Historian, and amateur radio operator -KK4WW   & N4USA .  I work out of one of the Tiny Homes at Chantilly Farm. A great place to work if you like the to be out in nature. I am 81 and ready to sell Chantilly Farm - I have a few more  projects I would like to do - if you have an interest to know more give me a call. 540 392 2392

EPROM Antique Memory Chip -- Intel C-2708

info click

Help needed with Antique Memory Chip 

 A project to make presentation displays for 
 2708 EPROM memory chips and a little history.

Intel C-2708 EPROM
memory chips.

I have 359 of these really nice Intel 2708 EPROM chips purchased in 1987. This chips are all nice white ceramic with gold pins and gold tops. They are part of my 45 years of collecting microcomputer memorabilia. 

What I want to do is make a presentation case/display for use as example of this early microcomputer and memory technology.  

Curious about EPROM memories - take a look here at a my blog post about the very first EPROM -  the Intel 1702A - Get an idea of  how and why they were used. "CLICK"

Moore's Law - see bottom of blog.

Intel C-2708 EPROM 

A Smart display/presentation case is easily  possible.

A small pic microcomputer can be included to provide many photos/videos and text that could be picked up on a smart phone using Bluetooth/WiFi connection. The unit could be connected to the internet with WiFi and linked to selected information on line about the history of microcomputers.

The use of these EPROMs is nice because the quartz window allowing a view of the IC chip. You should know the window was not put there for you to look into the IC - the window allows the memory to be erased by exposing the chip to UV light.

Photo of the 2708 EPROM
silicon chip that is viewed through
the quartz window on the IC.

It would be very nice to include a way to see into the window on the 2708 and get some idea what the actual silicon chip looks like. This could be a magnifying glass or maybe a photo of the chip would be best. Of course with the smart part of the presentation case just a view of the proper web site may be best way to obtain  more information.

Bottom side of 2708 EPROM
showing date code of 1977 &
made in Malaysia.

All my IC chips have a 1977 date code of manufacture.

More information about EPROM memories - here is my video of the 1702 the very first EPROM chip. You will find this interesting. 

Summary of project:

To build and market a beautiful small  presentation case about microcomputer technology - most  likely out of wood that could be on the desk or appropriate space on the wall. The unit could be just a nice piece on the desk of those who have an interest in microcomputer history or are currently involved in the technology.  It would be a great conversation piece with the smart technology to bone up on the history of microelectronic technology and a real piece of history included - the Intel 2708 EPROM. 

Contact Information"CLICK"

                                                                   Moore's Law

1000 GB or 1 Terabyte
Flash Drive. It would take
125.000,000,000 C2708 chips
to have this much memory!!!!

Moore's law seems to be working after 56 years. Gordon Moore made the observation and prediction in 1965 that the density of components on a silicon chip would double every 2 years. 


The USB Flash drive to the left is a 1 Terabyte of memory.
That is 1000 Gigabytes.

It would take 125,000,000,000 of the Intel C-2708 Chips to equal this amount of memory.  A really big change in 56 years of technology.  This 1 Terabyte USB flash drive cost $39.00.

David Larsen
 Blog Author

"by David Larsen"  Chantilly Farm owner, Computer Historian, and amateur radio operator -KK4WW   & N4USA .  I work out of one of the Tiny Homes at Chantilly Farm. A great place to work if you like the to be out in nature. I am 81 and ready to sell Chantilly Farm - I have a few more  projects I would like to do - if you have an interest to know more give me a call. 540 392 2392

Vintage EPROM Memory 1702A -Made microcomputers, robotics and microcontrollers pratical 1971

News item about SCELBI microcomputer  at  VCFSE 4-21-13 'CLICK'

1971
The first EPROM ( Electrically Programmable Read Only Memory ) 1702A changed computing forever. The 1702A is  Nonvolatile memory chip and does not lose its contents (program) when power is turned off.  RAM (Random Access Memory) used at the time was volatile - the contents was lost every time power was turned off.  Being able to program the microcomputer and have the program or data stay resident when power is turned off and  on was essential.
The nonvolatile EPROM's made the microcomputer a practical computing machine.

1702A EPROM Integrated Circuit

EPROM's did have limitations and were somewhat complex to use - yes it was nonvolatile and could be reprogrammed however;

1. To program the EPROM you had to remove it from the circuit and use a special programming circuit to enter the program.

2. To erase the program or data in the 1702A you had to shine UV light thought the little clear quartz window on the integrated circuit (chip). Looking though the quartz window in the photo of the 1702A you can see the integrated circuit ( the actual silicon chip is called a die ) inside and the little gold wires the take the electrical signals in and out of the die.

These two requirements were somewhat complex however once you had the program finalized and working correctly you could make as many copies of the EPROM as needed,  place the chips in the microcomputer and the program would reside  for 20 or more years.  The EPROM contents did eventually become corrupt as it is not a perfect device however most devices do not need to work more then 20 years unless you are sending them to the moon or outer  space.   EPROM's were not sent out on space missions - other forms of long term nonvolatile memory were used.



 Here is a video I made several years ago about the 1702A EPROM - a nice way to take a look at the Chip.




We are talking about the programs that need to be operational every time the computer is turned on. In the early days that perhaps would be the monitor program  that allows the computer to operate -take in information from the keyboard and some kind of display - video monitor or LED lights. If the computer was dedicated to being a controller the program needs to be available and running every time the computer is turned on.

The EPROM made the development of control programs possible because the program could be modified until it was operating as the developer wanted - then it could be duplicated by programming more EPROMS for addtional computers to sell.

The alternative was to load the program each time the computer was powered up or use PROM's. The first microcomputers did not have any fast or easy way to enter programs like floppy disk drives or hard drives. One of the first automated method of entering programs or data was to use a modified audio cassette tape player. This method of data entry was slow and often did not load correctly the first time.  The PROM chip is manufactured with the program or data in the chip and it could not be modified by the user. PROM's were  expensive to manufacture in small quantities .  The  PROM was used for producing computers in large quantities and the program or data in the EPROM needed no additional upgrades.

EPROM's were used  for only a few years as much better technology soon became available. The EPROM did progress  to be much larger then the 250 bytes in the 1702A - I think they made it to megabyte or more in a single EPROM  memory chip before the technology became obsolete.

Minicomputers of the 60's and early 70's used  ferrite core memory - a  nonvolatile memory and is 1000's of times physically larger then EPROM's and was never really considered for microcomputers because of the cost, size and complex circuitry to make it function. The microcomputer needed to use all solid state integrated circuit technology to be miniature and practical and the EPROM was answer at  that time. Now we have much more effective memory and don't need the EPROM technology - this was the start of practical microcomputers in 1971.

 This ferrite core memory module is about 3 inches square and
contains 1024 bits of information - that is 128 bytes. The electronic circuitry to  program and read these ferrite core's is not shown and is very complex. The 1702A EPROM contains 256 bytes of information.

S100 bus card with  EPROM Chips 1978.

EPROM memory cards were normal in the first generation of microcomputers - like the Altair 8800 microcomputer and most S100 bus computers.



Now - Forty two years after the 1702A EPROM's computer memory technology is very good and we have RAM memory that is nonvolatile and we can be assured the program we entered is ready for us when the computer is turned on.  A special use of nonvolitale RAM is the  USB memory stick or jump drive - it is programmable - nonvolatile and currently available up to 256G Bytes.

Today the 1702A EPROM is a collectable item and the white ceramic chips with gold pins are selling for $25 to $50 on Ebay.

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Spring seems to have arrived and it is warming up however I had a thick frost on the car window this morning.  In addition to working with my computer collection we are busy installing more street lights and water distribution at our Chantilly Festival Farm here in Floyd Virginia. Two big events at Chantilly next month - Floyd Auto Fair and  3rd Annual Bluegrass & BBQ festival.
Thank you for reading my computer blog -"by Dave Larsen" KK4WW Computer Collector/Historian

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