Since the AT28C256 is a 28-DIP, I just left the 12 left-most pins unconnected. The ZIF socket is a 40 pin device I had lying around. To gain some experience hand-soldering surface mount devices, I picked SMT packages for the shift registers and decoupling capacitors. The regular old Arduino UNO is 5v though and so should work nicely. Since the AT28C256 requires 5v for writing, we can’t use a Raspberry Pi or Arduino Nano/Mini as their GPIO ports are all 3.3v. The easiest approach is probably to use a microcontroller to bridge between the chip and a computer, run a bidirectional serial protocol between the microcontoller and the computer to send image data back and forth. Hence the project to build one ourselves. To load data you need an EEPROM programmer and like the chips, these devices have become somewhat rare and expensive. 2022 Hackaday Prize Enters Second Round: Reuse, Recycle, RevampĮrik van Zijst writes about designing a DIY EEPROM Programmer:.OSHWA announces Open Hardware Trailblazers.2022 Hackaday Supercon: Call For Proposals Extended.
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