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So why would one need an EPROM emulator? By its nature, this type of memory is “read only” and to change its content you need to erase it with UV light. Imagine you are developing software (well, firmware more likely) and you need to change the “program” in your EPROM memory. That means, remove the EPROM from it’s host computer, subject it to 20-30min of UV light exposure, program it with EPROM programmer, re-install in host computer. The entire process is extremely slow and has to be repeated every time you want to make even a small one bit change! And yes, there are modern EPROM alternatives based on Flash technology, that could save you the 20-30 min erase time, but the rest of the process is still the same and still annoyingly slow if you’re writing code and trying to “debug” it. This is where the EPROM emulator comes handy, a device that can temporary “replace” your EPROM chip, it is controlled by a computer and can be reprogrammed in seconds. Once you finish testing you can replace the emulator with EPROM chip programmed with the final version of your code.

It's perfect for developing code for older 8 bit computers, Z80 "monitor" development etc. I even use as a "universal" cartridge for my commodore 64.

Jul 20,2020
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