A question about you Triple Bios mod for the Dreamcast.

[iVirtualPlays]

I don't really care about the triple bios mod for the Dreamcast, it's completely useless for me. But I'm super interested in the dual bios mod using a single MX29L3211 bios chip, where I can switch from Dreamshell/Retro Dream to the standard region free bios. This is way better than PCB's hanging off the bios chip, or the messy Piggyback bios mod which is also a pain to install. Could you make a guide for this? Or could you just sell those chips preinstalled with 2 bio's instead of 1. Having one bios chip which contains two bios's would make for a much cleaner install with better reliability.

I came from this page: https://oshpark.com/shared_projects/OhXIa5Pw

I think I might be asking the wrong person here.

[DC-SWAT]

I don't sell anything and I don't have these chips. Also I don't recommend doing this, it's always better to leave the original BIOS, in case you flash something wrong, you can always boot from the GD-ROM or GDEmu to flash it again. It's important as a backup, which can't be accidentally damaged.

[iVirtualPlays]

I don't sell anything and I don't have these chips. Also I don't recommend doing this, it's always better to leave the original BIOS, in case you flash something wrong, you can always boot from the GD-ROM or GDEmu to flash it again. It's important as a backup, which can't be accidentally damaged.

I usually buy them preflashed and already have a Piggy Back Bios installed. Was just looking to switch over to have two bios's on a single chip that I'm never going to reflash. One to load Dreamshell and the other for the Region Free Bios. I'm not interested in ODE's since I prefer to play physical games along with switching over to my CF card when loading up Dreamshell.

[DC-SWAT]

You can merge two BIOS into one with console command:

Linux:
cat first.bios second.bios > both.bios

Windows:
copy first.bios + second.bios both.bios /B

[iVirtualPlays]

Would love to be able to do this. I never flashed chips before. Do I just drag and drop both bios files into the Command Prompt?

[DC-SWAT]

Would love to be able to do this. I never flashed chips before. Do I just drag and drop both bios files into the Command Prompt?

Nope. Just type from keyboard in command line :))

[DC-SWAT]

I have improved BIOS Flasher application, now you can flash several firmwares into your chip. But you need to switch 2 MB banks on it, it is impossible to flash more at once, because there is not enough address space.

[iVirtualPlays]

I see, I did order a 29L3211 chip preflashed. I just need to figure out how to install this chip into a Dreamcast. Do I just install it like a Piggyback Bios mod lifting up the same pins using 10K Resistors? And once I get it working by using the toggle switch. Can I flash a different bios over to each individual bank?

[DC-SWAT]

I see, I did order a 29L3211 chip preflashed. I just need to figure out how to install this chip into a Dreamcast. Do I just install it like a Piggyback Bios mod lifting up the same pins using 10K Resistors? And once I get it working by using the toggle switch. Can I flash a different bios over to each individual bank?

I think you can do that. But it's better to check with those who work with hardware mods. I'm more into software.
Maybe @megavolt85 can help with that.

[megavolt85]

the mx29l3211 pinout is a little different, the /WE signal is on pin1 and pin44 is used to switch memory banks