However, I did not buy an Arduino only to program memories, I have some here at home I use to all kinds of things.īelow is a schematic I came up with for the programmer: Why not also try EPROMs? Also, Arduinos are super cheap (Ebay/Ali express). I’ve used Arduino to program other kinds of memory. More information can be found on the 27C801 eprom d atasheet. The problem is just to do this for 8 * 1024 * 1024 = 8388608 addresses. To write a byte in EPROM simply select the address via pins A0, A1, A2 … and so on put the byte to be written in Q0 pins, Q1, Q2 … etc, and give a pulse with a high voltage ( 13V) in the Vpp pin. And it’s actually even easier to program than flash memories. Write flash memory is not trivial, there is a certain algorithm, but still is a relatively simple process. In 2014, I fixed Mega Drive cartridge using a BIOS chips found in scrap. Even the Chinese ones (It actually depends on the place, here you can pay overpriced from some scumbag or try to import and probably be taxed).Įverything has a cost-benefit ratio and Makers/Hackers are always creating super useful tools with cheap materials. Okay, but then why is not everyone making their own repros? Because a programmer is not so cheap.
The problem is that they are sold usually at prices comparing to those of original untouched cartridges. Searching for games I found a lot of repro cartridges (Cartridges with the ROM swapped) being sold at local second hand selling websites. But it only came with a bootleg Mortal Kombat cartridge.
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