The tables below shows available base systems. These contain essentially everything you need for a working system and thus make good starting points for those new to these types of systems.

RCBus 40-pin systems

SBC/Motherboards RCBus 40-pin	Z80 based	Z180 based
SCM + BASIC	SC114	n/a
SBC + BASIC + CP/M	SC191	n/a
RomWBW CP/M	n/a	SC130
Backplane & Modules RCBus 40-pin	Z80 based	Z180 based
SCM + BASIC	SC192	n/a
SCM + BASIC + CP/M	SC193	n/a
RomWBW CP/M	n/a	n/a

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RCBus 80-pin systems

SBC/Motherboards RCBus 80-pin	Z80 based	Z180 based
SCM + BASIC	SC708	n/a
SCM + BASIC + CP/M	SC720	SC126
RomWBW CP/M	SC720	SC126
Backplane & Modules RCBus 80-pin	Z80 based	Z180 based
SCM + BASIC	SC708	n/a
SCM + BASIC + CP/M	SC793	SC792
RomWBW CP/M	SC791	SC792

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Z50Bus systems

SBC/Motherboards Z50Bus 50-pin	Z80 based	Z180 based
SCM + BASIC	n/a	n/a
SCM + BASIC + CP/M	n/a	n/a
RomWBW CP/M	n/a	n/a
Backplane and Cards Z50Bus 50-pin	Z80 based	Z180 based
SCM + BASIC	n/a	n/a
SCM + BASIC + CP/M	SC592	n/a
RomWBW CP/M	n/a	SC591

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Non-expandable systems

SBC Not expandable	Z80 based	Z180 based
SCM + BASIC	n/a	n/a
SCM + BASIC + CP/M	n/a	n/a
RomWBW CP/M	n/a	SC131