The SEGA Master System Quick Solder BIOS is an additional BIOS that can solder beneath the original BIOS to enable multiBIOS operation. It is designed to compliment the switchless region & BIOS support mod kits which can enable the BIOS when set for the extended region modes. Combined with the switchless region & BIOS support mod kit, the BIOS is operated switchlessly. It can also be installed conventionally with a switch, but that would be silly.

Requirements

1 - A SEGA Master System with a 28-Pin BIOS.

AND

2 - A switchless region & BIOS support mod kit installed (for switchless operation).

OR

2 - A SPDT (On-On) switch and 2 x 1-kilohm Resistors (for switch operation)

Compatibility

Currently it only supports piggybacking on a 28-Pin BIOS. 32-Pin BIOS support will be added, if possible.

It should work with any Master System with a 28-Pin BIOS.

Manufacturing

• 1mm or 0.8mm PCB thickness are both fine.
• Castellated vias is recommended. Thin PCBs with non-castellated half cut vias don't generally result in torn up copper plating but cleaning the vias can be a time consuming chore.

Future Work

• 32-Pin BIOS support

Version History

• Quick Solder BIOS v1.0 - 19/11/2022
• Quick solder BIOS v1.1 - 06/05/2023
• Quick solder BIOS v1.2 - 23/02/2024