Skip to content

palazzol/TMS7xxx_dumper

Folders and files

NameName
Last commit message
Last commit date

Latest commit

 

History

70 Commits
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Repository files navigation

Internal ROM dumper for TMS7xxx series chips

Texas Instruments made a series of chips based on the TMS7000 microprocessor, which can contain internal programs in mask ROM. General Instrument / Microchip made versions of these chips as well (PIC7000 series).

In addition, at least one commercial IC with a different label is actually one of these internally. For example, the CTS256A-AL2, which was sold at Radio Shack, is actually a PIC7041.

This design supports all known chips in the series, including: PIC70XX, TMS70XX, TMS70XXX, TMS77XX, TMS70CXX, and TMS77CXX

This project uses some external code to dump the normally hidden mask ROM, and feed it to a host PC. In addition, it can identify the type of chip by determining the following parameters:

  • RAM size
  • ROM size
  • Presence of Serial Port
  • Process (NMOS or CMOS)

Instructions:

  • Program a 4K 2732-compatible EPROM or FLASH chip with the dumper.bin (Trojan program)
  • Program the Arduino Nano with the sketch dumper7k.ino
  • Connect via serial terminal, baud rate 115200, 8N1.
  • Follow the instructions on screen to identify the chip type and dump any internal rom as a Motorola S-Record format file to the screen
  • Save S-Record lines to a .s19 file
  • Convert file to binary using srec_cat, or similar tool:

srec_cat -o <filename>.bin -Binary <filename>.s19

About

Internal ROM dumper for TMS7xxx series chips

Resources

Stars

Watchers

Forks

Releases

No releases published

Packages

No packages published