Details, datasheet, quote on part number: DESCRIPTION The a 32, bit UV erasable and electrically programmable memory EPROM. It is organized. Donor challenge: Your generous donation will be matched 2-to-1 right now. Your $5 becomes $15! Dear Internet Archive Supporter,. I ask only. Buy 5V 4Kx8 DIP ns EPROM. [61 KB ]; Data Sheet (current) [92 KB ]; Fairchild Semiconductors [ KB ]; Representative Datasheet, MFG may vary.
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Nevermind, I found the AT28C64 datasheet.
Started by AbscissaSep 22 9: They do appear to still make AT28C64, which is an 8k chip. This is accomplished by sending the required command, address and data serially one bit at a time over single pins instead of the multiple pins of a parallel part.
The easiest way I know to do this is: It is an array of floatinggate transistors individually programmed by an electronic device that supplies higher voltages. The 6n89 and hcplhcpl octocouplers consist of an algaas led optically coupled to a high gain split darlington photodetector.
There is a pattern on each chip, meaning that a certain bit across the chip will program and certain other bits will not. If you are uncertain about support for a specific part, please don’t hesitate to contact us by phone or email. So, I’ll be spending my time trouble shooting. The minipro tl eeprom programmer software in use. Thanks for the help Mike.
These old chips were purchased new in I read on this forum about bit rot, but that seems to be about individual bits of a eeprrom EPROM changing. I have a home brew eraser.
eprom [Archive] – Vintage Computer Forum
I just don’t recall the temperature. I have cycled them a number of times and have found the many bits are stuck. These parts must be erased before programming.
Or is it pin-for-pin identical with burning as well as reading? They are most empty, ones. The images on the bottom right are close-up views of the first three eprom packages.
EPROMS , , , , , , ,
This approach allows you to more easily locate a device number, as many users do not eeprm the manufacturer of the device in which they have interest. An adapter for a readily available or 27C would be very easy to construct.
Sign in anonymously Don’t add me to the active users list. I had read somewhere that the had internal pull down resistors on the IR lines.
IC Datasheet: 2732 EPROM
I added some 1k pull downs on the IR lines and been watching the machine for the last few days and seems we are back to normal. Data is introduced by selectively programming 0s into the desired. I tried to program the chip over and over eepom, but no change.
The programmer devices required for programming the electrically programmable eepfom only memories eproms are generally expensive. I think it is time to give up on these chips.
AtariAge Home Lynx Jaguar. I figure the only thing I have to add to my memory card is a switch to either connect the MEMW to the chip or to ground it so that it is protected from when I screw up and send the machine off into the pucker brush. datssheet
These parts are always in plastic cases because the erasing of the part is done electrically without the need to expose the internal chip to ultraviolet light. I looked around for some new ‘s, but seems they are not made any more. KippFWIW, they’re both rated for 10 years data retention, and depending on the programmer one may be easier to program than the other.