Easy-EEPROM-programmer

Simply burn 2864 and 28256 EEPROM's.

• CA80 is all you need to burn 28C64.
• No additional harware needed.
• 28C256 is too big, then I build simply burner.

A few years ago I built a simple EEPROM programmer from a Z80-MBC2.

Today I decided to make a similar one for RC2014.

• I used a SC108 PCB on which I put only Z80 (CMOS) and U3 as programmer socket.
  • Modify the U3 connections:
    1. isolate PIN1 and connect A14 there (e.g. to PIN3 U2)
    2. isolate PIN27 and connect to WR_ (e.g. to PIN29 U2)
    3. PIN 20 connect to MREQ_ (e.g. in U2 connect PIN 22 to PIN30)
    4. isolate PIN22 (OE_) and connect to +5V through a 10k resistor (pull up)
• I used the Z80-MBC2 software (by J4F), however, I made a lot of modifications and new features.
• The code allows you to transfer data to the AT28C256 or KM28C64 memory (others have not been tested).
• I use "page write mode" when possible. Otherwise "single byte mode".
• First disable SDP.
• HL register is a memory pointer.
• The two instruction are "LD (HL),n" and "INC HL".
• Burn a record (16 bytes) in page write mode.

User manual.

• Just put the *.HEX (Intel HEX) files and the 28C256.txt file on the SD card.
• Up to five HEX files with name format 8.3 (xxxxxxxx.HEX)
• In the 28C256.txt file put the names without extensions separated by a space.

You can use breadboard instead of "CA80-bootloader".

• Just connect D0...D7, CLK, RESET and power.
• The description can be found in the code.

You can also burn 28C64 without any changes.

• Note that addresses A13..A15 are invalid.