![eprom programmer mac eprom programmer mac](https://hackaday.com/wp-content/uploads/2019/01/dataman_detail.jpg)
With this vintage chip erased, slapped together an EPROM programmer - with a programming voltage of 21V - out of an ATMega and a bench power supply.
![eprom programmer mac eprom programmer mac](https://nascom.files.wordpress.com/2017/06/g860t.jpg)
All you really need to do is shine a LED onto a chip for a few hours. Can five milliwatts do what three hundred watts couldn’t? Yes the LED had the right frequency to flip a bit, and erasing an EPROM is a function of intensity and time. Our ability to generate UV light has improved dramatically over the last fifty years, and remembered he had an assortment of LEDs, including a few tiny 5mW UV LEDs. This almost burnt down the house, and after a second round of erasing of six hours under the lamp, there were still unerased bits.
![eprom programmer mac eprom programmer mac](https://ae01.alicdn.com/kf/HTB1_Wb_kScqBKNjSZFgq6x_kXXa1/2021-New-TNM5000-USB-EPROM-Programmer-18pc-sockets-IC-Clip-for-NAND-flash-EPROM-MCU-PLD.jpg)
Fortunately, old electronics are highly resistant to abuse, so he pulled out the obvious equipment to erase this chip, a 300 watt tanning lamp. got his hands on an old 2764 EPROM for a project, but this chip had a problem - there was still data on it. There’s little need for these chip erasers now, so how do you erase and program a chip these days? Build your own chip eraser using components that would have blown minds back in the 70s. At the time, there were neat little blacklights in a box sold to erase these chips. These memory chips were erased with UV light shining through a quartz window onto a silicon die. Back in the old days, when we were still twiddling bits with magnetized needles, changing the data on an EPROM wasn’t as simple as shoving it in a programmer.