I'm just wondering if anyone has a sense on what the Dreamcast mod chip program does?
I'm assuming it checks for a code/frequency from point A (motherboard diode D501?) and transplants it onto point B (BIOS?) or vice versa, but does anyone know or have the mod chip program to hand or know specifically what it is inputting/checking/outputting and if so, when and where?
I have found the datasheet for one of the popular 4 wire IC's but as they are programmable they are not much use naked.
I ask because I'm not looking to flash the program as-is to a blank chip but I want to work out exactly what it is doing in the hope the region codes which are intercepted could be used for a region LED colour mod (orange for NTSC blue for PAL, or whatever you want).
I'm now one of the handful of people who own a Japanse, USA and PAL console so in theory if I had the equipment I could probe and find out myself - except I don't have the quipment - so I'm hoping someone more able/capable could furnish me with information or with the help of tools and region changer could join me on my journey of rediscovery.
I've forgotten most of what spent 5 years studying of electronics and this is my first real bash at it in 11 years so don't expect miracles from me - I'll get there in the end but it will just take me longer to complete the project.
Anyhow to summarise: If anyone has the Dreamcast mod chip/modchip program, it's source code or the specific region codes and details of it's programming such as a better understanding of what happens between the Dreamcast motherboard D501 diode, CE502 capacitor (just power?) and the IC501 BIOS ROM pin 28 and could share said understanding with me I would appreciate it.