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92 lines
5.1 KiB
Markdown
Executable File
92 lines
5.1 KiB
Markdown
Executable File
---
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title: "TommyPROM - An Arduino-based EEPROM programmer"
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permalink: /
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excerpt: "TommyPROM Arduino based programmer for 28C256 EEPROMs"
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---
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TommyPROM is a simple EEPROM programmer and reader that can be assembled using an Arduino and a
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few additional parts. It has been successfully built using the Arduino UNO, Nano and
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Boarduino models.
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The original code was specific to the 28C256 32Kx8 EEPROM, but it has been extended to
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also support SST39SF flash, 27C EPROMs, 29C flash and the Intel 8755A EPROMS.
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[](docs/images/TommyPROM-nano.jpg)
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Features include:
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* Simple hardware design that can be assembled on a breadboard.
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* ROM images transfers using XMODEM - no special host client needed.
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* Support for fast block EEPROM writes - a 32K EEPROM will program in just a few seconds.
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* Optimized code that supports the timing requirements needed to unlock the 28C series [Software Data Protection](docs/28C256-notes) Algorithm.
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* Modular software design to easily support other EEPROM, flash, and EPROM families.
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* Hardware support for 19 address lines, allowing the use of chips as large as 512KB, like the SST39SF040 and 29C040.
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## Design
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The 28C hardware and software design can be used with other 5V PROMS as well. Many 5V
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chips, including UV EPROMs such as the 2716, 2764, 27C2001 and 27C040, can be read, but
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not written, with the basic hardware. Some pin changes may be needed to get the signals to
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the correct pins on the device. See the [Extending the design](docs/extending) page for
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details on suggested hardware and software changes needed to support new
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[EPROM, flash,and EEPROM families](docs/prom-families).
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The PROM-specific code is modular and can be easily adapted to support additional devices.
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There are currently drivers for 28C series EEPROMS, SST39SF flash, 27C EPROMs and the
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Intel 8755A EPROM.
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Some 29C series chips, like the 29C010 can be written with the 28C hardware and driver.
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The 29C series only differs from the 28C in that the 29C chips erase and write an entire
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sector at a time. The 29C010 and some 29C020 chips use a 128 byte sector, which matches
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the XModem buffer in the current code. Other 29C020s and all 29C040s use a 256 byte
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sector and cannot be written without code changes to buffer up an entire 256 byte block of
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data before writing.
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The [hardware](docs/hardware) page has descriptions of the hardware designs and links to
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schematics. The [software](docs/software) page has class definitions and more information on
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the software design.
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The project was inspired by the
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[MEEPROMMER programmer](https://github.com/mkeller0815/MEEPROMMER).
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## PCB Version
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Although it was originally designed as a one-off programmer to be used on a breadboard,
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there are now some PCB versions as well. The [PCB](docs/pcb) page has descriptions with links
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to the KiCad schematics and Gerber files.
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[](docs/images/TommyPROM-pcb.jpg)
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## Compiling
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Open the TommyPROM.ino file in the Arduino IDE. It should automatically open the cpp and h
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files as well. The default code programs 28C series chips using Arduino Nano hardware. To
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use this version, just compile and upload it to the Arduino.
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**Note well** that this code has been optimized for the Aduino UNO and Nano hardware so
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that it can run quickly enough to meet 28C series chip timing requirements for SDP
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unlocking. To use different Arduino hardware, like the Micro, the board-specific code in
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PromDevice.cpp and PromAddressDriver.cpp must be changed to match the port mappings
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between the ATmega chip and the Arduino I/O pins.
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Because the Arduino has limited code and RAM space available, only one PROM driver is
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compiled in at a time. To change drivers, uncomment the desired PROM_IS_xx line in
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Configure.h and comment out the other choices. The code to instantiate the driver is
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near the top in TommyPROM.ino. The change to Configure.h will automatically cause a
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driver to be installed, but it may be necessary to modify the parameters for a specific
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chip type.
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## Troubleshooting
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* Verify that the Arduino type you are using is a supported board or that its I/O port definitions match one of the supported boards. Some other Arduino boards, like the
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Duemilanove, appear to be compatible but have not been tested. Others, like the Micro,
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have different port mappings and definitely will not work without software changes.
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* If the code doesn't appear to be working, concentrate on the read operations first to
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verify that the data and address paths are good.
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* 28C series EEPROMS, like the X28C256, sometimes ship from the factory with Data
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Protection enabled. Use the UNLOCK command to disable this. See the
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[28C256 Notes](docs/28C256-notes) for more information.
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* Re-check all hardware connections and verify the the control pins are going to the
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Arduino pins that match the definitions in the code.
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* This repo contains a standalone program called HardwareVerify that allows low-level
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access to the address, data, and control lines through a menu-driven interface. See the [troubleshooting](docs/troubleshooting) section for more tips.
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