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.