Components required on all ATOM network stations are;-
PCB Acorn Computers Ltd part no. 202,002 IC 1 MC6854P Advanced Data Link Controller IC 2, 3 2 off LM3l9N High speed dual comparitor IC 4 SN75159N Dual differential line driver IC 5 74LS123N Dual retriggerable monostable IC 8 DM81LS95 or 97 Tri-state octal buffer IC 9 74LS132N Quad 2 input schmitt NAND gate IC 10 74LS14N Hex schmitt inverter R 9, 10, 11 and 12 4 off 100K resistors R 13, 15, 16 and 17 4 off 100K R 14, 18 and 21 3 off 2M2 R 19, 20, 22 and 23 4 off 10K R 24, 25 and 26 3 off 1K R 27 39K R 28 and 29 2 off 10K R 34 10K R 35 to 42 8 off 47K C5 lOnF disc capacitor C6 lnF disc C7 10 to 47uF electrolytic C 11, 12 and 13 3 off 47nF discs C 14 10 to 47uF electrolytic Q1 BC239 npn transistor 1 off 28 way DIL IC socket 1 off 20 way DIL IC socket 1 off 16 way DIL IC socket 5 off 14 way DIL IC sockets 2 off 10 way Molex bottom entry sockets 4455-B
For stations generating the network clock add:-
IC 6 74LS74N Dual D type flip-flop IC 7 CD40l7B Decoded decade counter R 30 4K7 R 31 1K2 or 1K5, S.O.T. R 32 and 33 2 off 1K C 9 and 10 2 off 150pF discs 1 off 16 pin DIL IC socket 1 off 14 pin DIL IC socket C 8 is not required on the card
For terminating stations at the end of a network refer to the terminating instructions which specify some off;-
R 1 to 8 C 1 to 4 D 1 to 6