A Simple EPROM Programmer for the Motorola D2 Kit. Add 2K of firmware using a handful of components that fit right on the D2 board. Frank W. Summers. , , , , , , 27C, , 27C, , 27C, 27C, , , EPROM series. EPROM and CMOS. ON-BOARD EPROMS. ·-··~)epar:;t-;; -socket or (31< of EPRO~1s. /\ddressable by DIP swi tch to any 14K or br. bound,lry al)()vc.

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Paper data storage Drum memory Magnetic-core memory Plated wire memory Core rope memory s Thin-film memory Disk pack Twistor memory — Bubble memory — Floppy disk Sorry, your blog cannot share posts by email. The plant was transitioning to 0.

2708 / 2704 EPROM reader / programmer

The first two are copyright while the third is This is in fact incorrect. Latest CPU Images here. Both are actual dies! Not to mention some very nice pictures, so check it out.

This method of erasure allows complete testing and correction of a complex memory array before the package is finally sealed. Cambridge University Press, p. All Intel and National did was leave one address line unused tied to ground in this case. To retrieve data from the EPROM, eeprok address represented by the values at the address pins of the EPROM is decoded and used to connect one word usually an 8-bit byte of storage to the output buffer amplifiers.


The difference in eepdom Intel dies is also interesting.

It was designed to interface direction to theMCS and i processors. You may also view them in raw directory form here and a few that didnt make it into the eepron here. National also using a die.

Because higher-density parts have little exposed oxide between the layers eperom interconnects and gate, ultraviolet erasing becomes less practical for very large memories. Views Eepro Edit View history.

We must simply set the A1 digital port connected to pin 22 of the EPROM to zero, and read only the values between 0 and Every byte is separated by a space character. In my daily hunt for new processors, and other chips for the museum, as well as information about new chips, I constantly come across interesting chips, in strange locations.

Storing data in the memory requires selecting a given address and applying a higher voltage to the transistors. They result in smaller die sizes for the same part, which results in more chips per wafer, thus increasing revenue. A Mask ROM is just as it sounds, the program code is actually added to the actual mask itself when making the microcontroller die.

The was released BEFORE thethe being almost an afterthought, it is very likely that ALL dies are actually dies, as it would make little sense for Intel to create a separate mask set for a product that was likely to be low volume.

Its likely these dies had a defect so the affected area was effectively eeprrom by not using that address line.


First, the National Semiconductor die looked suspiciously like the Intel die. As you can see that while they are all the same part, the dies are significantly different. Photons of the UV light cause ionization eepron the silicon oxide, which allow the stored charge on the floating gate to dissipate. Even dust inside the package can prevent some cells from being erased.

The data eeprmo is 8 bit, so we can directly connect the bus data to one port of the PIC. Archived PDF from the original on Professional tools that can do this task are really expensive.

Users of the Python programming language often say it can do anything, and that may just be true.

EPROM – Wikipedia

This is simple and inexpensive. From Wikipedia, the free encyclopedia. Source and drain contacts are made to regions at the end of the channel. This creates an avalanche discharge of electrons, which have enough energy to pass through the insulating oxide layer and accumulate on the gate electrode.

By the A was out of date, its 16k of EPROM space was insufficient for most designs and its power consumption was much higher then contemporary parts. Retrieved from eeeprom https: Thats something Intel would be quite envious of.