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ICL used to use their own numbering schemes for their components,
replacing the old number with their number on the component. It was
said that this was done for security reasons, but I never got a
definitive answer. Any way below is a list of numbers that I have
accrued over the years working as an engineer for ICL. Also in those
days it was a useful list to have, because when boards were scraped
we used to spend many (and I mean many) hours de-soldering and
sucking off the components.
DILIC was ICL's acronym for Dual In Line Intergrated Circuit.
ICL DILIC Numbers
A SN7400 Quad, 2 input NAND Gate
B SN7420 Quad, 4 input NAND Gate
C SN7451 Dual, AND-OR-INVERT Gate
D SN7474 Dual, D-Type Flip-Flops
E SN7486 Quad, 2 input XOR Gate
F SN7430 8 input NAND Gate
G SN7440 Quad, 4 input NAND Buffers
H SN7402 Quad, 2 input NOR Gate
J SN7401 Quad, 2 input NAND Gate, with OC Output
K SN74122 Retriggerable Monostable
L1 SN74181 4-bit ALU
LN15 NE555 Timer
M1 SN7491 8-bit Shift Register
M2 SN7481 16-bit RAM
M3 SN7482 2-bit Full Adder
M4 SN74180 9-bit ODD/EVEN Parity Generator/Checker
M5 SN74153 Dual 4-Line to 1-Line Selector/Multiplexer
M6 SN74151 1 of 8 Data selector
M7 SN74157 Quad 2 to 1 Line Data Selector
M8 SN7485 4-bit Comparator
M9 SN74191 Binary synchronous Counter
M10 SN7495 4-bit Shift Register
M11 SN74155 Dual 2 to 4 Line Decoder
M12 SN7489 16 x 4-bit RAM
M13 SC1006 Quad Latch + Parity
M14 SN74118 Hex S/R Latch
M15 SN74200 256 x 1-bit RAM
M16 SN74148 8 to 3 Line Priority Encoder
M17 SN7496 5-bit Shift Register
M19 SN74164 8-bit Parallel Output Serial Shift Register
M20 SN74S138 3 to 8 Line Decoder/Multiplexer
M21 SN74S175 Quad D-Type Flip-Flops
M23 SN74S174 Hex D-Type Flip-Flops
M24 SN74S182 Look-Ahead Carry Generators
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