ELECTRONIC ENGINEERING
INTRODUCTION Many years ago, in 1976, MOS Technologies designed the KIM-1 microcomputer system to promote their 6502 CPU. This single-boad computer offered 2KB ROM, 1KB RAM, hex keypad, 7-segment LED display and little I/O (serial and tape interface). Let’s build a modern 6502 based single-boad computer with a more convenient user interface – the KIM-64.… Read more KIM-64
INTRODUCTION Matured computer hardware (e.g. Arcade PCBs, home computers, etc.) usually don’t have a debug interface, nor do they provide an easy way to alter the firmware. This firmware in form of an integrated circuit in a DIP-package ROM and/or EPROM is fitted on the PCB. This blog introduces a EPROM EMULATOR which can be… Read more EPROM EMULATOR SHIELD FOR ARDUINO MEGA 2560
INTRODUCTION GALmate is a GAL® multi-platform programmer for electronic hobbyists. A simple RxD/TxD UART interface keeps the connection effort to a minimum. This easy-to-build circuit uses industry standard components. HARDWARE FEATURES SOFTWARE FEATURES LET’S GET STARTED The Basics Starting point: I’d like to realize a (simple) logic design using a reconfigurable (programmable) logic device (PLD).Requirements:… Read more GALmate
Introduction This information is related to the programming mode of the PLDs listed below. Find more details in the Download section. GAL pinouts for EDIT mode GAL16V8/ATF16V8 GAL20V8/ATF20V8 GAL22V10/ATF22V10 GAL20XV10 GAL20RA10 GAL18V10 GAL26V12C GAL26CV12 GAL6001 GAL6002 GAL/ATF Architecture 16V8 & 20V8 detailed ACW bit information 16V8, 20V8 & 22V10 Row Addresses Map Block Diagram Download… Read more GAL specific information
HARDWARE OVERVIEW UART interface, 2x DCDC, ATmega16 Microcontroller, 2x PWM DAC, regulator LM723, OpAmp LM324, inverter CD4069 Supported devices Lattice, National, ST:GAL16V8, GAL18V10, GAL20V8, GAL20XV10, GAL20RA10, GAL22V10, GAL6001 (GAL39V18), GAL6002GAL26V12 & GAL26CV12 by using a simple 28-pin to 24-pin adapter Atmel:ATF16V8, ATF20V8, ATF22V10 FEATURES No parallel port and driver trouble Power over USB Programms all… Read more GALmate hardware
OVERVIEW The GALmate application lets you read and programm GAL devices.Whereas easyABEL and vDosPlus software provide a compiler suitable for ABEL-HDL design files. The compiler (easyABEL) and vDosPlus are optional. The application and related documents are provided in the download section below. FEATURES Sytem Requirements and Installation Operating System Windows 7 or later(Linux and OS… Read more GALmate software
INTRODUCTION Troubleshooting a dead C64 often reveals a faulty PLA IC as the root cause. The PLA does the address decoding and bank switching. SIGNETICS 82S100 (later PHILIPS PLS100) Bipolar Programmable Logic Arrays were used in early revisions of the C64 Mainboard assy, which were then replaced by MOS 8700-001 and MOS 906114-01. This blog… Read more C64 PLA Replacement
INTRODUCTION Push buttons switches are commonly used input devices. It takes some effort to filter out the glitches caused by contact bouncing in order to get a steady signal. Especially if the switch is a Single Pole Single Throw (SPST) kind of type. This blog describes a digital filter which will eliminate any glitches from… Read more Digital Debouncer