NOTE: After Adrian featured the device on his channel (https://youtu.be/JR0DCzCiAPk?si=yv8-zbL4BbIvlhgQ&t=2561), my one-month stock of emulators sold out in 2h :) Those are manually assembled by me, and are pretty labor-intensive to build, so I can only offer a few assembled units per week. I increased the price to deal with the demand. Don't forget this is an open-source project, with a full assembly guide, videos, and support via a group on groups.io, so if you have some experience soldering, you should be able to build it yourself.

Note: if you come here and stock is 0, put yourself on the waitlist - I re-stock (especially the assembled versions) once I have a few orders on the waitlist.

EPROM Emulator is a tool that can temporarily replace an EPROM memory chip inside your "target" device. You can plug it into your computer and "upload" a new version of code in seconds (instead of removing, UV erasing, reprogramming, and re-installing a traditional EPROM chip).

This type of tool used to be very popular (and essential) in the days of 8-bit computers (think of you Commodore, atari, zx spectrum etc.) It was the fastest way to develop firmware. It's a must-have for anyone dealing with those old platforms, testing different "loads" or writing low-level code.

It's not a new topic, similar projects have been published in electronics magazines many times. I just took some of my personal experiences, created a simple-to-understand architecture, used off-the-shelf components (no GAL or CPLD) with nothing that would require sophisticated tools to test or implement. Most importantly it's all open source so you can build it yourself, and for those who don't want to DIY - you can get a ready-made device. A detailed description on my website: MyGeekyHobby-EPROM-Emulator

What's included:

• professionally hand-assembled and tested EPROM Emulator
• 28 pin Emulator probe that supports 27C64, 27C128, 27C256, 27C512 EPROM chips (2716 and 2732 are supported in firmware and software but a 24 pin emulator probe would be needed, alternatively you can use the included 28 pin emulator probe, but leave the top 4 pins "sticking out" - in that case, power has to be provided to the emulator via USB). I recently posted an "experimental" version of firmware for the emulator that adds support for the popular 28C64 and 28C256 EEPROMs.
• 3D printed "base plate" with rubber feet to keep the emulator nice and sturdy (and protect the surface of your desk).

Please note: The colours of the PCB may be different from the pictured (depending on what I have on hand it will usually be standard green or black). The shape and color of the reset hooks on the cable will also change based on what I have in stock. Lastly, the Nano that controls the emulator also comes in different colors/styles (Currently shipping blue PCB style with mini USB plug). The current shipping design is based on hardware version 2.2c/1.9c.

The DIY option includes everything needed to build the emulator (see detailed list in one of the pictures).

International buyers: some countries may apply import and/or local taxes when the package arrives, this is beyond my control and those charges will be the responsibility of the buyer.

Legal Notice:

The device is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered to be a finished end-product fit for general consumer use. Persons handling the product must have electronics training and observe good engineering practice standards. As such the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in the products that incorporate semiconductor components or circuit boards. The user assumes all responsibility and liability for the proper and safe handling of the device. Further, the user indemnifies me from all claims arising from the handling or use of the device. Due to the open construction of the product, it's the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge conducted and radiated emissions. The device likely generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES.