• M37531M4T-XXXSP
  Single chip 8-bit CMOS microcomputer

• M37531M4T-XXFP
  Single-chip 8-bit CMOS microcomputer. ROM 8192 bytes, RAM 256 bytes, Mask ROM

• M37531M4T-XXGP
  Single chip 8-bit CMOS microcomputer. 256 bytes RAM, 8192 bytes mask ROM