/Easy-EEPROM-programmer

Simply burn 2864 and 28256 EEPROM's.

Primary LanguageC++MIT LicenseMIT

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.

28C64 burner

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. Hardware Hardware Changes
    • 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) Ready to use
  • 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. SDP disable
  • HL register is a memory pointer. LD HL,addr
  • The two instruction are "LD (HL),n" and "INC HL". LD (HL),data INC HL
  • Burn a record (16 bytes) in page write mode. Burn record

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. Burning

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.