I replaced the EEPROM in the 6502 board and checked that the message displayed was updated. The kit includes PCB, 28-way ZIF socket (option of budget or. To test the program I took the EEPROM which previously displayed "Goodbye, Cruel W" and changed the letter "l" (0圆8" to "t" (0x74). Its a simple EEPROM programmer shield, designed to sit on top of an Arduino Mega 2560. Its a simple EEPROM programmer shield, designed to sit on top of an Arduino Mega 2560. In fact the write process is very simple: disable the output pins, set address and data values on the bus then pulse Write Enable low for 1 microsecond to write data. It uses a nano and shift registers instead of a Mega to read/write the EEPROM but it provided useful hints for me to write to the EEPROM. Functionally this program was very similar to the 6502 video program to read from memory, so it was easy to implement in a sketch.īen has an Arduino EEPROM programmer as a separate video tutorial. Good Evening, Here, SRAM stands for Static Random Access Memory, and EEPROM stands for Electrically Erasable Programmable Read-Only Memory. This is a small space that can store byte variables.
ARDUINO MEGA EEPROM PROGRAMMER SERIAL
I firstly wrote a sketch to read data from the EEPROM and display on the Arduino serial monitor. // Arduino Mega 2560 28C256 EEPROM Programmer // Dec 1st 2019 : John D Lamb // Version 1.0 // // For use with a Arduino Mega 2560 or clone. I started with a separate breadboard EEPROM with digital I/O pins on an Arduino Mega 2560 connected to each I/O pin.
The TLS EEPROM programmer I have been using doesn't require special hardware capabilities so providing I connect the Mega to the three EEPROM control pins (Output Enable, Write Enable, Chip Enable) I should be able to write programs to it. We can add EEPROM capability to our Arduino projects quite easily.
I altered the Arduino MEGA sketch linked below to simply clock the counter. This can be very useful for applications that require calibration, or the storage of a user’s favorite settings. It was originally created for a 28C256 EEPROM, but the design has since been.
I have a Mega 2560 attached to the 6502 board connected to the address and data buses and therefore connected to most pins on the AT28C256 EEPROM. Adding EEPROM to our Arduino designs can allow our projects to retain data after being powered down. It works without any problem up to 27-30 bytes, but afterwards it goes low For example, I tried to write 0圎A (1110 1 010) to the first 200.
ARDUINO MEGA EEPROM PROGRAMMER CODE
My priority is to see if I can avoid the need to remove the EEPROM, burn new code in a programmer, and replace it each time I write, amend or correct a 6502 assembly program. I use an Arduino Mega to program an AT28C256 by using this code 1, but there is a weird issue The Arduino's pin 41 is connected to the AT28C256's pin 16 which is I/O 4. Having substantially completed Ben's 6502 Hello World project I can start to think what to progress myself.