F1 1.5A Pico Fuse Alert, Regional Power Jacks & Leaking SMD Capacitors

Nintendo used three completely different power input jacks and rectifiers across the Japanese Super Famicom, North American SNES, and European/UK PAL SNES! Even more importantly, 80% of "completely dead" SNES / Super Famicom consoles (no red power LED) simply have a blown green axial 1.5A 125V Littelfuse Pico II Fuse (F1) soldered on the left edge of the motherboard next to the 7805 regulator — often blown by unplugging the DC power cord while the main power switch was still ON or before discharging the main filter capacitor!

1 Regional Power Input Matrix

Region / Model	Jack Size	Required Input
Super Famicom (SHVC-001 JP)	5.5×2.1mm Barrel	9V–10V DC Centre-NEGATIVE (⊖) @ 850mA (NO bridge rectifier!)
US SNES (SNS-001 / SNS-101)	Proprietary 7.0×1.0mm Center-Pin	10V DC Centre-NEGATIVE (⊖) @ 850mA (Brittle plastic barrel cracks!)
PAL SNES (SNSP-001A UK/EU)	5.5×2.5mm Barrel (w/ Inner Pin)	9V–9.8V AC (1.3A) or 9–12V DC Any Polarity (has internal bridge rectifier!)

2 F1 1.5A Pico Fuse & 7805 Upgrade

Always Discharge Before Working Inside: Turn the SNES power switch ON for 3 seconds AFTER unplugging the power brick so the red LED flashes once and drains the main smoothing capacitor before you remove the metal shield!
Testing Fuse F1: Set your multimeter to continuity/ohms across the small green resistor-shaped component labeled F1 (SOC 1.5A) at the rear-left of the PCB. If open-circuit, replace with a 1.5A 125V Littelfuse Pico II (or clip-in fuse holder).
7805 Voltage Drop & White Vertical Line: Replacing the worn 7805 (1A) with a 78S05 (2A) and soldering a 470 µF 10V or 22 µF MLCC across the 7805 output/GND pins eliminates the faint white vertical bar down the middle of the screen!

3 SMD Capacitor Recap Checklist

Early SHVC-CPU-01, SNS-CPU-GPM-01/02, and SNS-CPU-RGB-01 boards use 8 to 11 surface-mount aluminium electrolytic capacitors that leak fishy electrolyte onto the video DAC and audio traces.
Critical Caps: C57, C58 (10 µF 16V Bipolar or tantalum audio coupling), C59 (100 µF 6.3V Video coupling — causes dark/rolling picture when dry!), and the 33 µF / 47 µF rail caps.
SHVC-SOUND Module: On 1990–91 consoles with the removable metal audio box, three SMD caps (10 µF & 47 µF) inside the module leak and mute one or both stereo channels!

Architectural Summary & Motherboard Generations

From 1990 2-PPU + Separate Sony Sound Module boards to 1995 S-CPUN 1CHIP and SNS-101 Jr. revisions

Main CPU (S-CPU) Ricoh 5A22 (WDC 65C816 16-bit core @ 3.58 / 2.68 / 1.79 MHz) + 8-ch General/H-Blank DMA, hardware 8×8 multiply / 16÷8 divide & auto-joypad read

Graphics (S-PPU1 & S-PPU2) 5C77 (S-PPU1 Tile/Sprite Address Gen) + 5C78 (S-PPU2 Color Math, Mode 7 Affine Matrix & DAC) — 256/512×224/448, 32,768 colour palette (256 simultaneous)

Audio (S-SMP + S-DSP) Sony SPC700 8-bit CPU (1.024 MHz) + Sony S-DSP 16-bit 8-voice BRR ADPCM sample processor @ 32 kHz with Gaussian interpolation & FIR echo filter

Memory & Cartridge 128 KB Work RAM (S-WRAM) + 64 KB Video RAM (2×32KB SRAM) + 64 KB Audio RAM; 46+16-Pin Cartridge Slot (supports Super FX, SA-1, DSP-1, CX4 co-processors)

2-PPU Motherboards (SHVC-CPU-01, GPM-01/02, RGB-01, APU-01) 1990 – 1994 • Separate S-CPU, S-PPU1 & S-PPU2

All first- and second-generation SNES and Super Famicom motherboards use three separate surface-mount QFP custom chips for the main system: U1 S-CPU (5A22-01/02), U2 S-PPU1 (5C77-01), and U3 S-PPU2 (5C78-01/02/03). While they have slightly softer horizontal RGB pixel edges than later 1CHIP boards, they enjoy 100% software accuracy with every game (including Air Strike Patrol shadow raster effects).

SHVC-CPU-01 (1990–91): Features the removable shielded metal Sony SHVC-SOUND daughterboard. Note that early S-CPU 5A22-01 chips have a known DMA controller silicon bug and higher failure rate than 5A22-02!
SNS-CPU-GPM-01 / GPM-02 (1992–93): Integrates the Sony SPC700 and S-DSP directly onto the main PCB and upgrades to S-CPU A (5A22-02).
SNS-CPU-RGB-01 & APU-01 (1994): Combines the Sony SPC700 and S-DSP into a single S-APU QFP chip and replaces the BA6592F video encoder with the S-RGB (BA6595F) encoder.

Super CIC & 50Hz / 60Hz PAL Switchless Mod

PAL SNES 50Hz Lockout: On a PAL SNES (SNSP-CPU-01 / 02), lifting Pin 24 of S-PPU1 and Pin 30 of S-PPU2 from their grounded PCB pads and toggling them between GND (60Hz NTSC) and +5V (50Hz PAL) switches the video refresh rate!
Lockout Chip (F411 / F413 CIC): Lifting Pin 4 of the 18-pin F411/F413 CIC chip disables the regional lockout on older games, while installing an open-source SuperCIC PIC16F630 unlocks 100% of SA-1 and S-DD1 titles (Super Mario RPG, Kirby Super Star, Star Ocean).

SNS-CPU-1CHIP-01 / 02 / 03 1995 – 1996 • Combined S-CPUN 160-Pin QFP

In 1995, Nintendo combined the S-CPU, S-PPU1, and S-PPU2 into a single 160-pin QFP ASIC labeled S-CPUN on the SNS-CPU-1CHIP-01, 1CHIP-02, and 1CHIP-03 motherboards (typically serial numbers starting with UN309+ in North America or late Super Famicoms). Because the digital-to-analog video conversion now happens inside a single modern ASIC without inter-chip bus capacitance, 1CHIP boards output dramatically sharper, razor-crisp RGB pixels.

1CHIP Brightness Attenuation & 1CHIP-03 CSYNC Restoration

Over-Bright RGB White Levels on 1CHIP: Factory 1CHIP boards drive their RGB lines roughly 15% too bright (~0.85 Vpp instead of 0.70 Vpp), clipping white highlights on OSSC/RetroTINK. Soldering three 750 Ω 1% resistors from the R, G, and B outputs of the S-RGB encoder to Ground (or replacing shunt resistor R3 of the S-CPUN DAC reference from 1.6 kΩ to 1.82 kΩ) restores exact SMPTE 0.7 Vpp levels!
1CHIP-03 Missing CSYNC on Multi-Out Pin 3: On the final SNS-CPU-1CHIP-03 revision, Nintendo omitted the resistor/transistor network connecting CSYNC to Multi-Out Pin 3! Bridge jumper pad R9 (or install a 470 Ω resistor) to restore CSYNC on Pin 3.

SNES Jr. (SNS-101) & Super Famicom Jr. (SHVC-101) 1997 • SNN-CPU-01 1CHIP Core

Released in late 1997 in a compact redesigned shell (`SNS-101` / `SHVC-101`), the SNES Jr. contains the exact same desirable S-CPUN 1CHIP ASIC on its SNN-CPU-01 motherboard! However, to cut costs, Nintendo disconnected RGB (Pins 1, 2, 4), CSYNC (Pin 3), and S-Video Luma/Chroma (Pins 7, 8) from the rear Multi-Out port, leaving only Composite Video and Stereo Audio enabled out of the box.

Restoring RGB & S-Video on the SNES Jr. (THS7374 / S-RGB Bypass)

Because the S-CPUN chip still outputs raw Analog R, G, B, and CSYNC on its pins (and the board even has an onboard S-RGB A chip with S-Video pins present!), installing a small THS7374 4-channel RGB bypass amp PCB wired to Multi-Out Pins 1, 2, 3, 4 turns the SNES Jr. into the cleanest RGB output SNES ever made!

Diagnostic Flowcharts & S-CPU / S-PPU1 / S-PPU2 Fault Matrix

Isolating power/reset failures vs. the infamous early-1990s SHVC custom silicon degradation ("Chip Rot")

⚠

1. Completely Dead — Red Power LED Does Not Light

Symptom: Switching the console ON produces no red LED and 0.00V on the motherboard +5V rail.

Diagnostic Decision Tree

Test Fuse F1 (1.5A Pico II): Measure continuity across the green axial fuse F1 next to the 7805 regulator. If open, check that the 7805 output pin isn't shorted to GND, then replace F1 with a 1.5A 125V Pico fuse.
Inspect US SNS-001 Rear DC Jack: On North American consoles, the plastic cylinder inside the rear power socket breaks off, causing the two metal contacts to lose tension or touch. Replace the rear power jack block.
Verify 7805 Regulator Input/Output: Confirm +9V to +13V DC on 7805 Pin 1 (Input) and +4.95V to +5.05V DC on Pin 3 (Output) when the power switch is ON.

⚡

2. Black Screen on All Cartridges (Red Power LED Lights Up)

Symptom: Red LED lights up and TV detects a black video sync signal, but no game boots or plays sound.

Diagnostic Decision Tree

Clean & Inspect the 62-Pin Cartridge Connector: Unlike the NES, early SHVC-CPU-01 boards have a removable press-fit 62-pin cartridge slot block! Unplug it, clean both upper and lower connectors with DeoxIT D5, and inspect for bent pins.
Check 21.47727 MHz Master Clock & /RESET (U10 Reset IC): Verify a clean 21.47 MHz clock entering S-CPU Pin 90 and confirm /RESET rises to +5V after power-on.
SHVC-SOUND Module Seating (1990–91 Boards): On SHVC-CPU-01 boards, if the removable metal sound box is unplugged or its 24-pin header has cold solder joints, every SNES game will hang on a black screen waiting for the SPC700 audio handshake at $2140!

🔍

3. S-CPU vs. S-PPU1 vs. S-PPU2 vs. WRAM/VRAM Fault Isolation Matrix ("SNES Chip Rot")

When an early SHVC-CPU-01 or GPM-01 boots the official SNES Burn-In Test Cartridge ROM (on an FXPAK Pro / SD2SNES) or shows graphical/gameplay corruption, use this symptom table to identify which QFP IC has failed before desoldering:

Suspect Chip	Classic Game / Visual / Functional Symptoms	Burn-In Test ROM Result & Bench Fix
`S-CPU` (5A22-01) U1 • QFP-100	Games boot title screen and play music, then crash when starting gameplay; sprites vanish or warp across the screen (broken DMA/HDMA); character walks in one direction uncontrollably (broken internal auto-joypad read); math errors in Mode 7 / RPG damage calculation.	Fails DMA, HDMA, Multiply/Divide, or Joypad tests. Replace early `S-CPU 5A22-01` with a donor `S-CPU A (5A22-02)` or `S-CPU B` using hot air + flux.
`S-PPU1` (5C77-01) U2 • QFP-100	Missing or scrambled sprite layers while background HUD text is legible; broken Mode 7 scaling/rotation (F-Zero, Super Mario Kart track is garbled blocks while sky/music work); vertical jailbar slices through tiles.	Fails OBJ (Sprite) or Mode 7 / BG rendering tests while VRAM chips test OK. Replace `S-PPU1 (5C77-01)` from donor board.
`S-PPU2` (5C78-01/03) U3 • QFP-100	Wrong palette colours, missing transparency/colour-math effects (ghosts in Super Mario World or water in Donkey Kong Country are solid black/opaque), or screen rolls/loses sync.	Fails Color Math / Window / Palette CGRAM tests. Inspect QFP pins for corrosion, or replace `S-PPU2 (5C78)`.
`VRAM` (U4 / U5) 2× 32KB SRAM	Consistent repeating vertical lines or corrupted characters across all backgrounds and sprites (U4 = Low Byte VRAM, U5 = High Byte VRAM).	Burn-In Test ROM flags `VRAM LOW` or `VRAM HIGH` FAIL. Replace the failed 28-pin SOP 32KB SRAM (`LH52256` / `TC55257`).

Dedicated SNES / Super Famicom Connector Pinouts

Bi-directional connector reference pages with interactive SVG diagrams and NTSC vs PAL RGB SCART schematics

1. Nintendo 12-Pin Multi-Out A/V Connector (NTSC vs PAL RGB SCART) →

Complete 12-pin Multi-Out diagram covering Analog RGB (Pins 1, 2, 4), S-Video Y/C (Pins 7, 8), Composite (Pin 9), Stereo Audio (Pins 11, 12), and the critical NTSC Pin 3 CSYNC vs. PAL Pin 3 +12V warning!

Open Multi-Out Pinout →

2. SNES / Super Famicom 7-Pin Controller & Mouse Port →

7-pin single-row keyed connector pinout, 16-bit dual-4021 shift register bit order (B, Y, Select, Start, D-Pad, A, X, L, R), SNES Mouse ID bits, and official Nintendo wire colour warning.

Open Controller Pinout →

SNES Custom Silicon, Audio & Memory Reference

Core processors and standard SRAM/logic chips shared with our IC Pinout Finder

QFP-100 • U1 S-CPU

Ricoh 5A22 (WDC 65C816 Core)

16-bit WDC 65C816 microprocessor core with 24-bit address bus (16MB memory space), 8-channel DMA/HDMA controller, hardware multiply/divide, and joypad serial interface.

Inspect 65C02/65C816 Family → SOP-28 • Cart Save SRAM

6264 (8KB) & 62256 (32KB) SRAM

Used on SNES LoROM/HiROM cartridges for CR2032 battery-backed game saves, and as the 2×32KB Video RAM (U4/U5) on 2-PPU motherboards.

Open 6264 SRAM Pinout → SOP-16 • Cart MAD-1 / Decoder

74LS139 Dual 2-to-4 Decoder

Used on early SNES LoROM/HiROM cartridges (before the Nintendo MAD-1 chip) to decode ROM chip enables and protect battery-backed SRAM during power-down.

Open 74LS139 Pinout → SOP-16 • Multi-ROM Decoder

74LS138 3-to-8 Line Decoder

Used on multi-chip SNES cartridges and development EPROM boards to split bank selects across multiple 27C801 / 29F032 flash ROMs.

Open 74LS138 Pinout →

Capacitor & Power Stage Reference

Super Nintendo (SNES) — Capacitor & Recap Reference

Board revisions, electrolytic capacitor lists, voltage/farad ratings, and SMD Electrolytic servicing notes.

Super Nintendo (SNES) — Printable Board Recap & Capacitor BOM ReferenceFormat this system's capacitor replacement list, diagnostic flowchart, and IC pinouts into a high-contrast bench PDF.

Super Nintendo (SNES / Super Famicom) — SHVC-CPU-01, SNS-CPU-GPM-02 & SNS-CPU-1CHIP-01/02/03

16-Bit 5A22 + S-PPU1/PPU2 & 1CHIP S-CPUN mainboards • Mount: SMD Electrolytic (+ 1 Axial/Radial bulk cap) • Difficulty: Intermediate (SMD rework)

Full Printable Recap Sheet →

SNES / Super Famicom Mainboard (SHVC-CPU-01 / GPM-02) (10 Capacitors)

Ref	Capacitance	Voltage	Package / Type	Circuit Location & Bench Notes
`C57`	10 uF	25 V	SMD
`C58`	10 uF	25 V	SMD
`C59`	220 uF	6.3 V	SMD	Often paired in parallel with C60 (two 220 uF = 440 uF total). Dried C59/C60 causes dark/rolling video.
`C60`	220 uF	6.3 V	SMD
`C61`	10 uF	25 V	SMD
`C62`	10 uF	25 V	SMD
`C63`	47 uF	16 V	SMD
`C65`	33 uF	25 V	SMD
`C66`	33 uF	25 V	SMD
`C67`	1000 uF	25 V	Axial / Radial

Printable Diagnostic Flowchart & Voltage CheckpointsFormat this step-by-step fault isolation tree into a high-contrast bench reference sheet.

Super Nintendo (SNES) — Interactive Diagnostic Flowchart & Voltage Checkpoints

Enable JavaScript to run the client-side interactive fault-isolation flowchart engine.

Complete Diagnostic Flowchart: Capacitive Load, ESR & Power Rail Ripple Diagnostic Tree (Universal Retro Mainboards (C64, Amiga, ZX Spectrum, Game Gear, Consoles))

STEP 1: Measure 100Hz/120Hz Peak-to-Peak AC Ripple on the +5V / +12V Bulk Filter Cap [node-1]

Set your oscilloscope to AC Coupling, 200 mV/div, and 2.5 ms/div (20 MHz bandwidth limit ON). Probe directly across the main bulk filter capacitor (e.g. C19 2200µF / C88 1000µF on C64, or C303/C304 on Amiga) under full system load. Measure the peak-to-peak sawtooth ripple amplitude (mVpp).

Expected Reading: < 50 mVpp clean regulated rail (post-regulator) or < 350 mVpp on raw unregulated bulk DC before the 7805/7812.

STEP 2: Check Linear Regulator (7805 / 7812) Input-to-Output Dropout Margin [node-2]

Switch oscilloscope or multimeter to DC Volts and measure Pin 1 (Input) of the 7805 (+5V) or 7812 (+12V) regulator at the bottom of the ripple trough. Verify that Input Voltage remains at least 2.0V above the regulated output (e.g. ≥7.2V into a 7805, ≥14.2V into a 7812).

Expected Reading: 7805 Input ≥ 7.2V DC; 7812 Input ≥ 14.2V DC. Below this dropout threshold, ripple punches straight through to the logic rail.

STEP 3: Check Local IC Decoupling & Audio/Video AC Coupling Capacitors [node-3]

Probe audio output coupling caps (e.g. C91 100µF on C64 SID Pin 27, or C324/C334 22µF SMD on Amiga Paula) — compare upstream vs. downstream signal amplitude. Inspect SMD electrolytic pads (Amiga 600/1200, Game Gear, DMG-01) under magnification for fishy odor, dull grey solder corrosion, or lifted copper traces.

Expected Reading: Full audio/video swing across the coupling capacitor with zero DC leakage on the output side and clean, shiny solder pads.

[ISOLATED FAULT: RES-BULK-CAP] Fault Isolated: High-ESR Bulk Filter Capacitor (>100 mVpp Rail Ripple) VERDICT

Excessive 100/120Hz sawtooth ripple on the DC rail confirms that the primary reservoir/filter electrolytics have dried out and lost effective capacitance.

[ISOLATED FAULT: RES-REG-DROPOUT] Fault Isolated: Linear Regulator Dropout / Bridge Rectifier Diode Open VERDICT

The pre-regulator DC rail is sagging below the minimum 2V dropout headroom required by the 7805/7812 regulator.

[ISOLATED FAULT: RES-COUPLING-CAP] Fault Isolated: Open/Leaky Audio or Video Coupling Capacitor & Trace Corrosion VERDICT

Signal attenuation, muffled audio, or DC offset hum across the coupling stage indicates dried-out or leaking coupling capacitors.

[ISOLATED FAULT: RES-RAILS-HEALTHY] Verification Passed: Power Rails, Ripple & Coupling Capacitors Within Spec VERDICT

All measured DC supply rails, AC ripple levels (<50 mVpp), and coupling stages pass bench specification. If performing a preventive recap, use the verified board BOM below.

Interactive Pinouts, Visualizers & Disassemblers

Super Nintendo (SNES) — System Bench Tools & IC Pinouts

Click any chip below to open its interactive DIP/PLCC pinout diagram, pin-by-pin signal table, and oscilloscope test waveforms.

Super Nintendo (SNES) — Printable IC Pinout & Chipset SummaryPrint this system's custom IC pinout summary or open any chip card below for its full DIP/PLCC pinout sheet.

DIP-16 74-Series Decoders

74LS138

SN74LS138N / DM74LS138

3-to-8 line decoder with three enable inputs and eight active-low outputs — the classic memory-address decoder.

Open Interactive Pinout →

DIP-16 74-Series Decoders

74LS139

SN74LS139N / DM74LS139A

Dual 2-to-4 line decoder — two independent decoders, each with one active-low enable and four active-low outputs.

Open Interactive Pinout →

DIP-40 MOS 6500

WDC W65C02S

W65C02S / W65C02S6TPG-14

The CMOS 6502 people actually buy today — fully static, runs to 14 MHz, but NOT a drop-in for the NMOS 6502 without pin 1, 5 and 36 attention.

Open Interactive Pinout →

DIP-28 EPROM

27128 / 27256 EPROM & CPC 40009 System ROM

Amstrad 40009 / 27C128 (16KB) / 27C256 (32KB) / 27C512

16KB (27128) and 32KB (27256) JEDEC 28-pin ROM/EPROM — direct drop-in replacement for the Amstrad CPC 464's 32KB OS + Locomotive BASIC ROM (IC103, part 40009).

Open Interactive Pinout →

DIP-28 Static RAM

6264 8K x 8 SRAM

6264 / HM6264 / 5564 / TC5565 / UM6264

8K x 8 SRAM, the JEDEC 28-pin byte-wide standard. Two chip selects of opposite polarity — leave CS2 floating and it never responds.

Open Interactive Pinout →

Visualizer

Signal & Trace Visualizer (Scope)

Compare healthy vs. faulty CPU clocks, reset ramps, PLA strobes, and 5V PSU ripple waveforms.

Disassembler & ROM Lab

Retro File Utilities (Rust/Wasm)

6502/6510 disassembler with IC register links, C64 .D64 parser, and EPROM CRC32 verifier/patcher.

Logic & Pinouts

Connector & Port Pinout Reference

59 interactive RGB SCART, DIN A/V, PSU polarity, joystick, floppy, and expansion bus pinouts.

Logic & Pinouts

Logic & RAM Substitution Guide

Cross-reference 4116→4164 DRAM mods, 2364→27C256 EPROM adapters, and 74LS/74HCT swaps.

Workshop Rescue & Community Rehoming Free UK Shipping Never Resold

Dead Super Nintendo (SNES) on the Bench — or Clearing Out Spare Kit?

Worked through the fault checklist and found a dead custom IC, severe trace rot, or a repair you don't have the gear to tackle? Don't scrap your Super Nintendo (SNES) — donate faulty machines, donor boards, joysticks, cables, or peripherals to Smiggy's Workshop. We cover UK shipping and never resell a single item.

Donate Super Nintendo (SNES) / Parts →

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Where Refurbished Donations Go — Free to the Community

Donated joysticks, controllers, cables, peripherals, and restored computers/consoles are tested on Smiggy's bench and rehomed completely free of charge (including UK postage) to enthusiasts, makers, and STEM projects.

Browse Rehoming Bench → Donate → Refurbish → Rehome Free

Super Nintendo (SNES / Super Famicom) Hub

F1 1.5A Pico Fuse Alert, Regional Power Jacks & Leaking SMD Capacitors

1 Regional Power Input Matrix

2 F1 1.5A Pico Fuse & 7805 Upgrade

3 SMD Capacitor Recap Checklist

Architectural Summary & Motherboard Generations

2-PPU Motherboards (SHVC-CPU-01, GPM-01/02, RGB-01, APU-01) 1990 – 1994 • Separate S-CPU, S-PPU1 & S-PPU2

Super CIC & 50Hz / 60Hz PAL Switchless Mod

SNS-CPU-1CHIP-01 / 02 / 03 1995 – 1996 • Combined S-CPUN 160-Pin QFP

1CHIP Brightness Attenuation & 1CHIP-03 CSYNC Restoration

SNES Jr. (SNS-101) & Super Famicom Jr. (SHVC-101) 1997 • SNN-CPU-01 1CHIP Core

Restoring RGB & S-Video on the SNES Jr. (THS7374 / S-RGB Bypass)

Diagnostic Flowcharts & S-CPU / S-PPU1 / S-PPU2 Fault Matrix

1. Completely Dead — Red Power LED Does Not Light

Diagnostic Decision Tree

2. Black Screen on All Cartridges (Red Power LED Lights Up)

Diagnostic Decision Tree

3. S-CPU vs. S-PPU1 vs. S-PPU2 vs. WRAM/VRAM Fault Isolation Matrix ("SNES Chip Rot")

Dedicated SNES / Super Famicom Connector Pinouts

1. Nintendo 12-Pin Multi-Out A/V Connector (NTSC vs PAL RGB SCART) →

2. SNES / Super Famicom 7-Pin Controller & Mouse Port →

SNES Custom Silicon, Audio & Memory Reference

Ricoh 5A22 (WDC 65C816 Core)

6264 (8KB) & 62256 (32KB) SRAM

74LS139 Dual 2-to-4 Decoder

74LS138 3-to-8 Line Decoder

Super Nintendo (SNES / SFC) — Unified Workbench Reference

Super Nintendo (SNES) — Capacitor & Recap Reference

Super Nintendo (SNES / Super Famicom) — SHVC-CPU-01, SNS-CPU-GPM-02 & SNS-CPU-1CHIP-01/02/03

SNES / Super Famicom Mainboard (SHVC-CPU-01 / GPM-02) (10 Capacitors)

Complete Diagnostic Flowchart: Capacitive Load, ESR & Power Rail Ripple Diagnostic Tree (Universal Retro Mainboards (C64, Amiga, ZX Spectrum, Game Gear, Consoles))

Super Nintendo (SNES) — System Bench Tools & IC Pinouts

74LS138

74LS139

WDC W65C02S

27128 / 27256 EPROM & CPC 40009 System ROM

6264 8K x 8 SRAM

Signal & Trace Visualizer (Scope)

Retro File Utilities (Rust/Wasm)

Connector & Port Pinout Reference

Logic & RAM Substitution Guide

Theme Palette

Audio & Display

System Info