12/21/2023 0 Comments Arduino mega eepromOne thing that I may change later on is adding a 42-pin socket instead of a 32-pin socket and removing the PLCC. It may potentially need to go to pins 22, 1, or maybe even others. Please give me suggestion on how to switch our VPP signal to different pins of the ROM via software. If just flashing or reading eeproms requiring only +5v then just the USB connection should suffice. A simple and small 7812 can be used on the board to get +12v and since the VIN or RAW pin will connect from the Mega, a single wall wart PSU can power both the arduino and the VPP. VPP is required to program older UV erasable eproms. Then I want to add some sort of software controlled relay or transistor switch to control VPP which is +12v. The idea is that the arduino Mega has an external memory interface which will natively (kinda) read and write to various RAM modules, so whats keeping it from reading and writing eeproms? If you erase the IC's and follow the specs in the datasheet, it has to work! Whats even better is that it will be fully USB compatible and has a massive number of GPIO just waiting for expansion.įor starters, I want get it working with both 32-pin DIP eeproms and 32-pin PLCC eeproms. Another person I know can program the 42-pin 16-bit eproms, but not the 40-pin versions. Sometimes it doesn't even make it past the first byte. Mine in particular will program any and all 8-bit eproms, but once I use the adapter to interface with 16-bit eproms, it fails miserably to finish a write. If you own a Willem programmer, you're probably concerned with how difficult it is to get running and even once you do, it probably does a shit job of programming and reading proms of any sort. A new option which will remain open source so that everyone can made modifications and improvements to both the hardware and software. After years of struggling with Sivava's Willem Programmer, I decided it high time to make a new affordable option.
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