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README.md

EPROM Reader for Teensy++ 2.0

A simple EPROM reader for the Teensy++ 2.0 AVR development board. Only 16 bit EPROMs supported so far. Tested with a 32 Mbit M27C322

Components

  • 1x Teensy++ 2.0
  • 3x 74HC595 shift registers

Usage

To read 32 Mb from the Teensy++ at /dev/ttyACM0:

$ time ./eprom_reader.py -d /dev/ttyACM0 0 4194304 out2
# Insert lots of dots scrolling by here...
 ./eprom_reader.py -d /dev/ttyACM0 0 4194304 out2  22.73s user 6.95s system 1% cpu 44:23.71 total

It takes over 44 minutes to read a 32 Mbit EPROM so it's definitely not the fastest thing out there. There is lots of room for improvement.

Hooking it all up

Description Teensy++ 2.0 Pin EPROM Pin
Data 0-7 F0-F7 Q0-Q7
Data 8-15 B0-B7 Q8-Q15
Output Enable C0 G_n
Chip Enable GND E_n

The shift registers are hooked up as per the schematic.

schematic

Here it is all hooked up.

photo

About

A 16 bit parallel EPROM reader using a Teensy++ 2.0 and some shift registers!

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