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  • Electronics & KiCAD Tips (24)
  • From Idea to Product (13)
  • Retro Tech & Restoration (6)
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Recent Posts

  • 83Redux: Part Two – Fujitsu 29LV400TC (U15)
  • I2C Level Shifting With The TCA9517 With Reference Schematic
  • 83Redux: Part One – A Journey into the TI83 Plus Graphing Calculator
  • Electricity 101: Understanding Voltage, Current, and Resistance
  • Retro Electro: The Untold Stories of Electronics History
Original Hardware (Circa 2003) for the TI83 Plus graphing calculator
January 19, 2026

83Redux: Part Two – Fujitsu 29LV400TC (U15)

David Ray

The datasheet of this flash module lists that Pin 16 should not be connected (N.C.), but the board being examined has a connection on this pin.

US-BASED PCB ASSEMBLY

Placing a PCB Assembly Order with Cyber City Circuits

Read More about Placing a PCB Assembly Order with Cyber City Circuits

THE CYBER CITY BLOG

SOIC-14 Package

ATTINY1614 Micro-Controller: Good Info to Know

By David Ray

Retro Electro: The Untold Stories of Electronics History

By David Ray
Clean Traces

The Key to a Successful MVP: Choosing the Right Features

By David Ray
Generating Gerber Files in KiCAD 7 on MacOS

Generating Gerber Files in KiCAD 9 on MacOS

By David Ray
4 Position - 3.81 mm Pitch - Straight - Screw Socket

Top 5 Pluggable Screw Terminal Socket Connectors

By David Ray

Requirements – Objectives vs Constraints

By David Ray
Three ceramic capacitors

Capacitors: Three Things that Affect Capacitance

By David Ray
The 'D' Hitkey lets you drag traces.

KiCAD Tip: Press ‘F’ For ‘Auto-Complete Trace’

By David Ray
Du Mont 224-A Oscilloscope Original Front Pannel

DuMont: Part One – An Allen B Du Mont 224-A Restoration

By David Ray
TI83 Plus Graphing Calculator Circuit Board

Top Tips and Tricks for Maximizing the Use of Decoupling Capacitors in PCB Design

By David Ray
2 Position, 5 mm, Green, Straight Plug

Top 5 Pluggable Screw Terminal Plug Connectors

By David Ray

Why a MVP Can Be More Effective Than a Fully Realized Product

By David Ray
TI83 Plus Graphing Calculator Circuit Board

83Redux: Part One – A Journey into the TI83 Plus Graphing Calculator

By David Ray
CR2032 batteries

Top 5 CR2032 Battery Connectors to Consider

By David Ray
Recommended Soldering Pattern

KiCAD Tip: Making a Reverse Mount LED Footprint – The Simple Way

By David Ray
GCT USB Type-C connector

These Are a Few of My Favorite Type-Cs (USB-C 2.0 Guide)

By David Ray
A panel of circular printed circuit board assemblies

Much Ado About Panelization and Mounting Holes

By David Ray

Maximizing Connectivity with the Nexperia NCA9555 I/O Expander

By David Ray
Original Hardware (Circa 2003) for the TI83 Plus graphing calculator

83Redux: Part Two – Fujitsu 29LV400TC (U15)

By David Ray
Minimum RP2040 Schematic Reference

Designing with the RP2040: Minimum Requirements Design

By David Ray

Recent Posts

  • 83Redux: Part Two – Fujitsu 29LV400TC (U15)
  • I2C Level Shifting With The TCA9517 With Reference Schematic
  • 83Redux: Part One – A Journey into the TI83 Plus Graphing Calculator
  • Electricity 101: Understanding Voltage, Current, and Resistance
  • Retro Electro: The Untold Stories of Electronics History
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