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Email: jeff@retrotimegames.com
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Dreamcast Bios Mod
Parts needed:

MX29LV160TMC-90 CMOS Flash Memory Chip
10k resistors (x2)
On-On Switch (SPDP or DPDT)
There are 3 different dreamcast main board revisions (that I’m aware of).
These are:

VA0 (very early board with the metal heat sinks and pipes)
VA1 (The most common)
VA2.1 (the last revision)
VA0
VA1
VA2.1