Re: Selectable chips & boost programming

["Programmer" <nwester@eidnet.org>]

David,

Just got something from Fairchild SemiCond, and I'll try to decipher what
this spec sheet shows. Whew...this is totally foreign territory to me.
Looks like data address inputs are from A0 through A16. There's no info on
what each pin corresponds to which address on the chip.  The additional
address lines are A17-A19. Are these the ones you connected via switch ?

LW
-----Original Message-----
From: David Cooley <n5xmt@bellsouth.net>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: February 25, 2000 8:44 AM
Subject: Re: Selectable chips & boost programming


>At 10:38 AM 2/25/2000 , you wrote:
>>David,
>>
>>Do you have the specifics on how this is done ? I'm VERY
>>interested in doing this...I'd like to run a nitrous program and
>>"regular" program--and a program for high octane on TBI
>>stuff...
>
>Don't have anything in hardcopy, but it used a 27C128 chip stock, so I used
>a 27C010, mapped all the similar address, Data, power and control lines to
>a 28 pin plug so the plug looked like a 27128 to the ECM. Took the 3
>additional address lines and ran them to a BCD thumbwheel switch, and the
>Thumbwheel switch I believe grounded the lines when they were active (I
>could have that backwards...) and used pull-up resistors on the lines to
>the switch. I loaded a program into the burner, set the switch on the
>number I wanted that program to be in the chip, and burned it, loaded the
>next bin, set the switch to where it was supposed to be and burned it, etc.
>You could switch programs on the fly without a hiccup out of the engine
>(unless you were screaming and selected valet or security mode!). Worked
great!
>
>
>===========================================================
>David Cooley N5XMT Internet: N5XMT@bellsouth.net
>Packet: N5XMT@KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
>We are Borg... Prepare to be assimilated!
>===========================================================
>

>