Appendix s5u1c330mxd1 board, A.1 outline of s5u1c330mxd1 board, A.2 names and functions of each part – Epson S1C33 User Manual
Page 21: Sw1 (reset switch), Sw2 (nmi switch), Sw3 (debug switch), Rs232c connector, S5u1c33xxxdx/target board i/f connector