SP-80 pinout
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/ \
PPU A0 <- PPU A13 <- / 79 80 02 01 \ <> PPU D0 -- GND
PPU A1 <- PPU A12 <- / 77 78 04 03 \ <> PPU D1 <> PPU D7
PPU A2 <- PPU A11 <- / 75 76 06 05 \ <> PPU D2 <> PPU D6
PPU A3 <- PPU A10 <- / 73 74 08 07 \ <> PPU D3 <> PPU D5
GND -- PPU A9 <- / 71 72 10 09 \ <- CLK <> PPU D4
PPU A8 <- PPU A4 <- / 69 70 12 11 \ -> VIDEO ?? ?
PPU A7 <- PPU A5 <- / 67 68 14 13 \ <- /RESET -- VCC
PPU /A13 <- PPU A6 <- / 65 66 16 15 \ <- $4017 D0 <- $4016 D2
PPU /WE <- PPU /RD <- / 63 64 18 17 \ <- $4016 D0 <- AMP IN
/IRQ <- NC -- / 61 62 20 19 \ -> $4016 CLK <- $4017 D1
CPU R/W <- CPU /RMS <- \ 59 60 22 21 / -> AUDIO OUT <- $4017 D2
CPU A0 <- CPU D0 <> \ 57 58 24 23 / <- $4017 D3 <- $4016 D1
CPU A1 <- CPU D1 <> \ 55 56 26 25 / <- $4017 D4 -> OUT0
CPU A2 <- CPU D2 <> \ 53 54 28 27 / -> OUT2 -> OUT1
CPU D3 <> VCC -- \ 51 52 30 29 / -- GND -> AMP OUT
CPU D4 <> CPU A3 <- \ 49 50 32 31 / -- NC -> $4017 CLK
CPU D5 <> CPU A4 <- \ 47 48 34 32 / -> CPU A11 -> CPU /RAM
CPU D6 <> CPU A5 <- \ 45 46 36 35 / -> CPU A10 -> CPU M2
CPU D7 <> CPU A6 <- \ 43 44 38 37 / -> CPU A9 -> CPU A12
CPU A14 <- CPU A7 <- \ 41 42 40 39 / -> CPU A8 -> CPU A13
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Applies also to TQFP80 version named 1818P [1]
Source: [2]
