Motherboard: Tandon 8" DOS/Controller *300023-001 MB Position Pins Chip ----------- ---- ------------- 1E 14 DM7438N 1F 14 DM7438N 2D 20 74LS244N 2F 16 DM74LS123N 2H 14 MC4024L 2G 14 MC4044P 2E 14 DM74LS04N 3A 14 DM7414N 3B 14 DM74LS04N 3C 28 MOS300541-001 ("REV B") 3D 14 74LS174N 3E 14 74LS08N 3G 14 DM74LS86N 3H 14 SN74S74N 4A 14 74LS00N 4D 24 F68A10P (8227S) 4F 14 DM74LS74AN 4G 14 DM74LS00N 4H 14 SN74S74N 5B 14 DM74LS42N 5C 40 MOS6502A (3382) 5D 14 DM74LS02N 5E 14 WD1797B-02 floppy disk controller 5F 14 DM74LS04N 5G 14 DM74LS32N 6E 14 DMLS11N 6G 14 DM7438N 6H 14 74LS175N 6A,6B,6C,6D 18 MM2114N-25 6F 18 WD2143M-03 7A,7B,7C,7D 18 MM2114N-25 7E 14 DM74LS02N 7F 14 DM74LS04N 7G 4 NE555N 7H 14 DM7406N 8A,8B,8C,8D 14 DM74LS157N 8H 14 DM74LS00N 9A 14 DM74LS08N 9B 14 DM74LS42N 9E 40 MOS6502A (3382) 9F 40 MOS6532A (4981) 9G 40 MOS6532A (1382) 9H 14 DM74LS02N 10B 14 DM74LS04N 10C 28 MOS300542-001 ("REV A") 10D 28 MOS300543-001 ("REV A") 10E,10F,10G 14 MC3446AP 10H 14 DM7414N