What is it?

Arduino MEGA shield for programming of dip-28 32kB EEPROMs (such as AT28C256). Also it can be used as an external RAM shield for Arduino MEGA.

Why did you make it?

In replacement of my clumsy breadboard EEPROM programmer I made for my Z80 breadboard computer project.

What makes it special?

Minimalistic but functional and convenient in usage. Also it's blue, which matches Arduino boards. Pinout is described in overlay. This shield requires 28-pin ZIF for EEPROMs; 2x18 PLD socket for connection with MEGA; LED for WE indication (when LED goes out - writing is done); general purpose SMD button that I use for starting write session; 3x SMD (0402 or 0805) resistors (10k for button and WE pull-up and 1k for LED current restriction). In order to prevent wobble of the shield I put 1 PLS stub with short end cut off (included) in MEGA pin socket 8 and it works well. I could make a corresponding via on the shield for soldering this clingy pin in, but I decided not to as in the current way it's handy both in operation and in storage.