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parts.lst
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1986-07-03
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Parts list for one megabyte memory board with clock
Chips
Qnt Type Pwr Gnd Loc Comments
2 74LS00 14 7 B1, B5
2 74LS04 14 7 A6, B3
1 74LS10 14 7 A4
2 74LS20 14 7 A2, A7
2 74LS74 14 7 A3, B4
1 74HC74 14 7 A8 Pwr from battery, not +5
1 74125 14 7 D4
1 74LS138 16 8 A1
5 74LS153 16 8 C1, C2, C3, C4, C5 (May be 74LS253)
1 74LS175 16 8 A5
2 74LS393 14 7 B2, C6
2 74HC244 20 10 D3, D5 (May be Am2966, NOT 74LS244)
3 74LS245 20 10 B8, D1, D7
1 MC146818 24 12 C8 Pwr from battery, not +5
32 Rams 8! 16! E1 thru H8 (May be any 256k by 1 dynamic ram
at 200ns or faster access time.
I have tried several brands,
both CMOS and NMOS, with
no problems.)
Capacitors
48 0.1 uf ceramic cap 12v or higher (bypass caps at each chip, not on schem.
2 1.0 uf ceramic or tantalum, 12v or higher
1 10 pf NP0 ceramic or mica
1 4-20 pf variable (substitute any cap that covers 7-15 pf range)
Diodes
5 1N4148, 1N914 or equivalent
Resistors all 1/4 watt 5% film
1 560 ohm
1 100k
1 390k
1 22M if not available substitute 10M
Crystal
32768 Hz watch crystal
Battery
4 Nicad cells with holder. Either A or C size is ok.
Sockets
14 14 pin wire wrap sockets. I substituted 16 pin for a price break.
39 16 pin wire wrap sockets.
5 20 pin wire wrap sockets.
1 24 pin .6 in spacing wire wrap socket.