M223 Ma and Mb Registers

The M223 module is a component used in the PDP-15 computer system, containing two 4-bit registers with input gating logic. By combining five of these modules, the system forms the 18-bit Memory Buffer (MB) register and the 13-bit Memory Address (MA) register for each memory bank. The MA register manages core location selection, while the MB register facilitates the transfer of data or instructions between the central/IO processors and memory. The document also provides technical specifications for the module, including input pin loadings, output driving capabilities, and power dissipation requirements.