Hi I want to switch my Piggy back Bios over to a 4MB MX29l3211 Bios chip. A single chip that can hold two Bios's. Can you flash two Bios's onto that chip? I will then need to figure out how to wire a toggle switch up to it. I want to switch over from the Piggy Back Bios which is a kind of messy mod, and can be rather unreliable when you have to take apart the console again. In my case, 1 of the bios's isn't working anymore. They both used to work, but after going back into my console to go over my DCDigital Mod. One of Bios's stopped working. I could reflow the bios's again but after coming across the post below. I would much rather just get rid of that set up and have one single large bios that can switch between two Bios's as it would end being a more reliable, simpler and a cleaner install over both the Piggy Back and PCB Addon boards. The only issue is there is no guide on this, there's just a post about it.
Source: https://assemblergames.org/viewtopic.php?t=10407&start=30
submitted by /u/iVirtualZero
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![[link]](https://i.redd.it/ittl6gqvwjsc1.png){kind=link}
Source: https://www.reddit.com/r/dreamcast/comm ... g_one_4mb/