copy eproms

[944Technologist]

I have done this with a BOSCH Motronic. You tie the upper most address to a
switch that switches from 0V to 5V. Bring the switch out so that it is
accessed from the outside. A flip of the switch changes between the two
programs (upper & lower 128 banks).

FR Wilk
_________________________________________________

----- Original Message -----
From: "Tom Cheung" <tcheung at associated-labels.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, December 04, 2001 11:43 AM
Subject: Re: Re:copy eproms


> 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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> >
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