'7747 Flash Chip Conversion (27SF512)

[89-S-dime]

I had Dave do the conversion on 7747 I bought from him, this method is the way to go, no clearance issues with cover

[89S10_Project]

Dumb question- this is called a "Flash upgrade"- why is it called this if one must still burn and swap out the chip?

In my field, "flash upgrade" means you can simply upload a new operating system or firmware for a system over a cable, no need to manipulate the hardware.

[dave w]

The 27SF512 chip is an Electronically Erasable Program Read Only Memory (EEPROM) chip. Most chip programmers can usually erase the 27SF512 chip in about second maybe even less time than that! EEPROM's can usually be fully programmed in a few seconds (3 to 5 seconds)

The original 7747 chip is us ally a 2732a chip that is an Erasable Program Read Only Memory (EPROM) chip. EPROM's usually require exposure to Ultra-Violet light for about about 20 minutes to erase. The EPROM usually takes more about 2 minutes, sometimes more to be fully programmed

So the "Flash" is basically how quickly the chip can be erased and reprogrammed. Basically, the 27SF512 can be erased and programmed in less time than it takes to remove the chip from a 7747 computer, even with the 7747 chip access cover removed.

dave w

[89S10_Project]

OK thanks for the clarification. Is there a gm analog to the EBL setup?

[dave w]

OK thanks for the clarification. Is there a gm analog to the EBL setup?

I'm not sure I completely understand your question.

Moates.net offers a chip emulator called the Ostrich 2.0 http://www.moates.net/ostrich-20-the...eed-p-169.html which replaces the chip. The Ostrich 2.0 can be updated real time, even while driving the vehicle.

dave w

[89S10_Project]

I'm not sure I completely understand your question.

Moates.net offers a chip emulator called the Ostrich 2.0 http://www.moates.net/ostrich-20-the...eed-p-169.html which replaces the chip. The Ostrich 2.0 can be updated real time, even while driving the vehicle.

dave w

That looks pretty much ideal. I think I want to avoid having to burn chips all the time while I'm tuning. Still not sure though.

[Six_Shooter]

EPROM Emulating speeds up the tuning so much, I don't know why anyone would go any other route in this day.