Thanks for the memory

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Project by oldnovice posted 07-19-2012 09:35 PM 2174 views 2 times favorited 18 comments Add to Favorites Watch

In the 1970’s I was deeply involved with the microprocessor evolution and all of the hardware required to build stand alone microprocessor based equipment. We started as a small group and over the next few years grew to the point that in the early 1980’s we some people decided move on. When two of our group decided to leave we wanted to give them a going away gift to remember their time with us.

As a going away remembrance I made a scaled up version of one of the first EPROMs (Electrically Programmable Read Only Memory). These memory packages had a quartz window so they could be erased by ultraviolet light. The die inside the package was readily visible.

The image above was one of the original packages that later evolved into lower cost packages with round windows as shown below.

The package above was my reference package for the scaled up model. To replicate the die I used individual photos of the group (blurredfor posting on LJ) and arranged them in a grid with a message above (wiped out) and a message below. The 24 pins on the package were made from brass, bent on a brake, and screwed to the middle base.

A Plexiglas cover was cut, mounted in the opening, and secured with black RTV to simulate the epoxy on the real package.

The bottom of the package was left clear for signatures from the people left behind.

-- "I never met a board I didn't like!"

18 comments so far

View dustprocrastinator's profile


76 posts in 2592 days

#1 posted 07-19-2012 09:43 PM

Nice memories, and i can only imagine how your work paved the way for nowaday flas drives

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Dan'um Style

14171 posts in 3889 days

#2 posted 07-19-2012 11:31 PM

cool posting BUD

-- keeping myself entertained ... Humor and fun lubricate the brain

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525 posts in 2118 days

#3 posted 07-20-2012 01:42 AM

Awesome build… I spent many a days programming EPROMS for some Z80 base controller boards at a place I worked at in the 80’s.

-- Visit my blog at

View S4S's profile


2118 posts in 2587 days

#4 posted 07-20-2012 06:17 AM

Very impressive , cool .

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2024 posts in 2974 days

#5 posted 07-20-2012 12:30 PM


A very cool tribute – you should be proud.


-- Robert Rhoades WoodWorks / Email: /

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144 posts in 2062 days

#6 posted 07-20-2012 01:07 PM

Really Nice! very interesting. Thanks for sharing.

-- --May you have fair winds and following seas--

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939 posts in 2698 days

#7 posted 07-20-2012 03:02 PM

Very cool piece and a great recent history lesson. Sometimes I forget how much the world has changed in my life time.

-- Mel,

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30147 posts in 2772 days

#8 posted 07-20-2012 03:36 PM

It’s really nice and I bet they really cherish them.


-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

View bunkie's profile


412 posts in 3053 days

#9 posted 07-20-2012 05:23 PM

How creative!

I dealt with my fair share of EEPROMs (2708, 2716, 2732) filled with 8031 and 8051 code.

-- Altruism is, ultimately, self-serving

View clieb91's profile


3520 posts in 3841 days

#10 posted 07-20-2012 08:44 PM

A very cool memento for someone to take with them. Radio Shack used to actually sell these when I worked there in the 80’s


-- Chris L. "Don't Dream it, Be it."- (Purveyors of Portable Fun and Fidgets)

View Doe's profile


1399 posts in 2736 days

#11 posted 07-20-2012 08:44 PM

I remember EPROMs (sigh). It’s a really wonderful gift.

-- Mother Nature talks, I try to listen

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#12 posted 07-22-2012 12:19 AM

That is very cool, thanks for sharing

-- Norman - I never never make a mistake, I just change the design.

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8099 posts in 2483 days

#13 posted 07-22-2012 12:33 AM

Makes for a great gift Oldnovice, very good work.

View Russ's profile


356 posts in 2983 days

#14 posted 07-22-2012 04:31 AM

I love this as a geek growing up in the 80s I really liked this.

-- Russ

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6550 posts in 3273 days

#15 posted 07-22-2012 05:42 AM

Thanks to the geeks and non geeks,

The company I worked for was on the leading edge, and sometimes the bleeding edge, of the microprocessor revolution. I wrote a P.O. for three 8080’s, that were only available in CERDIP package, for $395.00 each. At that time it was the most expensive single item my company had ever purchased.

From that we built our own proprietary microprocessor system with RAM boards, EPROM boards, a number of digital I/O, analog I/O, and special function boards all into a custom card rack. We did this because there was nothing available on the market that met our requirements for building self standing equipment.

For development system we had an Intel 8080 MDS unit, serial number #8!

I really enjoyed those days!

-- "I never met a board I didn't like!"

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