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In-Circuit Programmer for 6502 Project - Theory of Operation & Schematic Review
This video covers the design and operation of an in-circuit EEPROM programmer built specifically for the 6502 CPU board project. Learn how this programmer interfaces with the CPU board through a CPLD to enable on-board programming without removing chips.
What's Covered:
The programmer works in conjunction with the CPLD, which operates in three distinct modes:

Mode 1 (Standard): CPU board functions as a normal computer
Mode 2 (EEPROM Mode): 6502 placed in high-impedance state for programming
Mode 3 (Hybrid/J-Link Mode): Real-time monitoring of address bus, data bus, and control lines during code execution

Key Components:

Microchip AVR64 DD32 microcontroller (24MHz, 64K flash, 8K RAM)
FTDI USB-to-serial interface chip
Line drivers and buffers for address bus control
Desktop application for command-line control

Technical Features:

Command-line interpreter architecture
USB communication via FTDI chip
Address bus reading and writing capabilities
Built-in LED logic analyzer for debugging
TLA5202 logic analyzer support with synchronous clock output

The programmer acts as a bridge between desktop software and the CPU board, executing commands to read, write, and erase EEPROM memory with built-in programming algorithms specific to the target device.
Coming Soon: Separate videos on AVR64 DD32 programming and desktop software development.

Github Link to project files:
https://github.com/TerryAbs/ABSDataSystems