![arduino eprom programmer arduino eprom programmer](https://bertiusgames.com/projects/eeprom/burnerMain.jpg)
On a 27C512, the G*Vpp pin goes to the A4 pin on the Arduino (also for a 27C256, you want to hook up A4 of the Arduino to OE*) Wire up the EPROM to the meeprommer address latch stuff so that you can read from the EPROM.and when we’re finished we’ll remove all the crazy extra voltages and just read read read). Instead, our one will just go write write write …. a normal EPROM programmer might go write verify write verify …. We kind of throw out the ability to immediately verify each byte we’ve written (eg. We will cheat here and just move a jumper wire or have a toggle switch (this provides endless opportunities to destroy your EPROMs if you’re not careful). Now, a proper EPROM programmer would have some clever stuff to programmatically switch voltages on the appropriate IC pin. In theory I could have used another DC boost converter to generate the 6.45V from a 5V input. I wired the input of this to the 5V from the Arduino, and before connecting it to anything I adjusted the output voltage to 13V (a 27C512 wants 12.75V +/- 0.25V, and a 27C256 wants 13V +/- 0.25V). This was advertised on ebay as ‘2A booster board DC-DC step-up input 2/24V to 5/9/12 / 28V Replace XL6009 M92’ and cost maybe $1.50. Used a DC boost converter I bought ages ago thinking I would run something off 2 AA cells.Before connecting this to anything I adjusted it so that it produced 6.45V (a 27C512 wants 6.25V +/- 0.25V, and a 27C256 wants 6.5V +/- 0.25V) So this has 12V in, and a trimpot to adjust the output voltage.
![arduino eprom programmer arduino eprom programmer](https://320volt.com/en/wp-content/uploads/2012/11/93xx-eeprom-programlayici-c-pic16f628.jpg)
It was fine.Įventually I worked out that the Thinkpad was running on battery (I had plugged it in and forgotten to turn it on. My Willem had blown up its 74HC04 some time back, so I checked the replacement one I put in. Now ensues an hour or two of trying to figure out what was wrong. I tried to burn a 32K image … and nope … the Willem decided to burn a solitary ’00’ byte to the first byte in the EPROM … and do nothing more. I got the Willem out, plugged it into my trusty old Thinkpad T42 (it has a parallel port!). Recently I was trying to burn a 27C512 to put into my C64C. When I bought it, it seemed like the cheapest way of programming the special 16bit EPROMs used in the Amigas. Other times you tear your hair out trying to figure out whats wrong with it. I’ve had a lot of weird problems with the Willem. I bought it when I was trying to burn Amiga Kickstarts, but I’ve used it for burning 27C256’s and 27C512’s as well. I have a Willem parallel EPROM programmer (or clone).