copy eproms

[Tom Cheung]

great stuff Tim, you have answered my next questions
but as i am totally green at eproms addressing programming, etc...

would it be too much to ask for specifics i can understand...??

i do have 2 programs that i want to put onto a 27c256
1) factory program on a 27c128
2) performance program ona 27c128

a little foggy about loading the 2 programs onto the burner software, I will
be buying it next week (needhams pb10)
and can i switch between the 2 programs while the car is running?

if what you described i can accomplish...fitting both programs on a single
27c256 and able to switch between them
as i wish...that would be just fantastic

mucho gracias!!


Tom Cheung

tcheung at associated-labels.com
www.associated-labels.com
----- Original Message -----
From: "Timothy J Burgess" <tjburgess at west.raytheon.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, December 04, 2001 10:40 AM
Subject: Re:copy eproms


> Or you may use the larger PROM to store two separate loads of code (or
four
> loads with a 27C512) & easily select between the two.  Here's how I built
> up the multiple load selection hardware:  Attach a 5 x 1 header to a 28
pin
> DIP socket near pin 28 - connect header pin 1 to socket pin 28 (+5 volts),
> connect header pin 3 to socket pin 27 (programmer address msb; A14),
> connect header pin 5 to socket pin 14 (gnd), connect header pin 2 to
header
> pin 4.  Attach the wires to just below the body of the socket.    Bend up
> pin 27 (address 14) of the PROM.  Install the PROM in the socket.  Solder
a
> wire between pin 27 of the PROM and pin 2 of the header.  Use a jumper
> (shorting) block to select the PROM mode:  Short header pins 1 & 2 = Use
> load @ address 0x4000 to 0x7FFF.  Short header pins 4 & 5 = Use load @
> address 0x0 to 0x3FFF.  Short header pins 2 & 3 = Program PROM.  Load both
> 16K PROM loads at the starting address indicated above (0x0 & 0x4000) in
> the PROM programmer memory before programming the 32K PROM.  If a 27C512
> PROM is used, A15 is the address msb & it is located at pin 1 of the 28
pin
> DIP.  The PROM data sheets (pinouts) may be found at
> http://www.atmel.com/atmel/products/.
>
> Tim
>
>
> Date: Tue, 4 Dec 2001 09:15:30 -0000
> From: "Richard M" <richm at ntlworld.com>
> Subject: Re: copy eproms
>
> Yes, but depending on what the ECU does with the extra address line, it
may
> not work if you only copy the bottom 128K into the larger eprom - best to
> duplicate the 128K code onto the 256K part (same in the lower 128K and
> upper
> 128K), so the code will be the same from the ECU's perspective,
> irrespective
> of what state the most significant address bit is in.
> Regards
> Rich
> - ----- Original Message -----
> From: Tom Cheung <tomcheung at telus.net>
> To: <diy_efi at diy-efi.org>
> Sent: Tuesday, December 04, 2001 6:49 AM
> Subject: copy eproms
>
>
> > can i copy data from a 27c128 eprom to a 27c256 eprom easily?
> > i will purchase a needhams programmer to do this
> >
> > the 128k eprom is harder to get and may be more expensive
>
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