Re: Selectable chips & boost programming

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

David,

Which address lines do you add--A17-A19 ??
Do you then switch those via the ground pin 16--or are you
switching through outputs O0-O7 ? If I ask a stupid question,
please don't respond in kind <g>. Which of the A0-A16's did you apply to the
socket...I don't have one of these handy, so I've got a lot of questions...

LW


>
>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!
>===========================================================
>
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