6578 pinout
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_______ IRQ1 -> / 1 100 \ <- /IRQ4 IRQ2 -> / 2 _ 99 \ <- IRQ3 NC -- / 3 (_) 98 \ -> $4016.1 JOY1CLK <- / 4 97 \ -> $4016.0 KEY_CLK -> / 5 96 \ <- $4016.1 KEY_DAT -> / 6 95 \ -> JOY2CLK PRG A20 <- / 7 94 \ <- $4017.0 PRG A19 <- / 8 93 \ <- $4016.0 PRG A18 <- / 9 92 \ -> AEN PRG A17 <- / 10 91 \ <- /RST PRG A16 <- / 11 90 \ -- GND /EXRAM <- / 12 89 \ -> AUDIO I/O 7 <> / 13 88 \ -> VIDEO I/O 6 <> / 14 87 \ -- VCC VCC -- / 15 86 \ <> Crystal 2 CPU A11 <- / 16 85 \ <> Crystal 1 M2 <- / 17 84 \ <> I/O 0 CPU A10 <- / 18 83 \ <> I/O 1 CPU A12 <- / 19 82 \ <> I/O 2 CPU A9 <- / 20 81 \ <> I/O 3 CPU A13 <- / 21 80 / <> PPU D4 CPU A8 <- / 22 79 / <> PPU D3 CPU A14 <- / 23 78 / <> PPU D5 CPU A7 <- / 24 77 / <> PPU D2 CPU D7 <> / 25 76 / <> PPU D6 CPU A6 <- / 26 75 / <> PPU D1 CPU D6 <> / 27 74 / <> PPU D7 CPU A5 <- / 28 73 / <> PPU D0 CPU D5 <> / 29 72 / -> /PTR_ST CPU A4 <- / 30 71 / <- REGION CPU D4 <> \ 31 70 / <- TEST2 CPU A3 <- \ 32 69 / <- TEST 1 CPU D3 <> \ 33 68 / <> I/O 4 CPU A2 <- \ 34 67 / <> I/O 5 CPU D2 <> \ 35 66 / -> PPU A14 CPU A1 <- \ 36 65 / -> PPU A13 CPU D1 <> \ 37 64 / -> PPU A0 CPU A0 <- \ 38 63 / -> PPU A12 CPU D0 <> \ 39 62 / -> PPU A1 CPU R/W <- \ 40 61 / -> PPU A11 /ROMSEL <- \ 41 60 / -> PPU A2 NC -- \ 42 59 / -> PPU A10 GND -- \ 43 58 / -> PPU A3 VCC -- \ 44 57 / -> PPU A9 /RTCAS <- \ 45 56 / -> PPU A4 /PW <- \ 46 55 / -> PPU A8 /PR <- \ 47 54 / -> PPU A5 GND -- \ 48 53 / -> PPU A7 PPU /WR <- \ 49 52 / -> PPU A6 PPU /RD <- \ 50 51 / -> /XVRAM -------
Legend: Input: -> [6578] <- Output: <- [6578] -> Multidirect: <> [6578] <> Power/Other: -- [6578] -- Unknown: ?? [6578] ??
- NC: No Connection; Leave Floating
- /EXRAM: CS for External RAM ($6000 - $7FFF); Active Low
- /RTCAS: Signal of Address Strobe for RTC
- /PW: Write Signal for peripheral at $4080 - $43xx
- /PR: Read Signal for $4080 - $43xx
- /XVRAM: /CS of External VRAM (PPU $8000 - $FFFF)
- TESTx: Test Pins, Leave Floating
- REGION: 0 = PAL; 1 = NTSC
- /PTR_ST: Signal for Printer to Strobe Data
- AEN: For extending peripheral; like "AEN" signal of ISA bus of PC ($41xx - $43xx)
- IRQx: IRQ Input. Active High, except for /IRQ4, which is active low