BEGINNER HELP

[Carlo Putter]

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Hi

Basically what you need is an EPROM programmer (and reader) to read an =
EPROM. Another feature of most of these programmers is that they can =
program/read the code in microcontrollers like the Microchip PICs and =
ATMEL chips.

I have seen some kits/projects on building an EPROM programmer in the =
ETI magazine, Electronics Austrailia magazine, and most proberly any =
elctronics magazine has featured an EPROM programmer/reader/simulator.

In order to reprogram an EPROM you have to erase it. This is done by =
means of Ultra violet light. (EPROM eraser).

If you actually want to modify the data in the chip you first of all =
have to read it. Secondly you have to know what you want to modify and =
where this data is situated in the EPROM. If you kow all this data you =
have to figure out what each of the values mean. Then you can edit the =
EPROM data with an HEXadecimal editor. Finaly you can reprogram the =
erased EPROM and see whether you have created an explosion.

Hope this solves most of your questions.

Cheers
Carlo Putter
Stellenbosch
South Africa

-----Original Message-----
From:	Geoff & Sue Richards [SMTP:geoffsue at one.net.au]
Sent:	Monday, November 02, 1998 6:02 PM
To:	Diy_Efi
Subject:	BEGINNER HELP

hello
maybe I been askin' wrong questions to learn 'bout proms
I got prom in my hand comes from same vehicle as mine (Australian)
What tools do I need to read what's in this?
What tools do I need to modify this?
the prom I have spare was replaced in service 'cause of a standard DTC
under warranty so I scored it PCM No 16176424
If I can just have a look inside this I'll have a starting point
TIA
Geoff

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