Oversized EPROM's & Multiple Programs

Rich M rsrich at cwcom.net
Tue Jun 26 07:38:33 GMT 2001


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I do the same thing; without delving into the hardware and including =
some logic, you'll need to switch off the engine, select the program =
position you want to run by switching the state of the higher address =
line on the Eprom, and restart.

Cheers

Rich
    -----Original Message-----
    From: Walter Sherwin <wsherwin at home.com>
    To: gmecm at diy-efi.org <gmecm at diy-efi.org>; diy_efi at diy-efi.org =
<diy_efi at diy-efi.org>
    Date: 26 June 2001 00:21
    Subject: Oversized EPROM's & Multiple Programs
   =20
   =20
    To those who are using, or have used, oversized EPROM's that contain =
more than one program image........
    =20
    Can you simply select between say Program "A" and Program "B" while =
on the fly, or do you have to power/idle down and then switch from one =
to the other?  This would be for a two program solution in place of a =
single 27c256b chip, for a friend who has new young drivers in the =
family (think of it as a sort of valet mode).  Is more than 2 images a =
big hassle in place of a 256 chip?  The selector switch would be a keyed =
Allen Bradley jobbie.
    =20
    Anyone have any interesting tidbits archived on this topic, on their =
HD's, that they can pass along?  I'm going to dive into the list =
archives over the next few nights, but any direct pointers would =
certainly help a bunch.
    =20
    Walt.

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<DIV><FONT color=3D#000000 size=3D2>I do the same thing; without delving =
into the=20
hardware and including some logic, you'll need to switch off the engine, =
select=20
the program position you want to run by switching the state of the =
higher=20
address line on the Eprom, and restart.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Cheers</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Rich</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: =
5px">
    <DIV><FONT face=3DArial size=3D2><B>-----Original =
Message-----</B><BR><B>From:=20
    </B>Walter Sherwin &lt;<A=20
    =
href=3D"mailto:wsherwin at home.com">wsherwin at home.com</A>&gt;<BR><B>To: =
</B><A=20
    href=3D"mailto:gmecm at diy-efi.org">gmecm at diy-efi.org</A> &lt;<A=20
    href=3D"mailto:gmecm at diy-efi.org">gmecm at diy-efi.org</A>&gt;; <A=20
    href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> &lt;<A=20
    =
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A>&gt;<BR><B>Dat=
e:=20
    </B>26 June 2001 00:21<BR><B>Subject: </B>Oversized EPROM's &amp; =
Multiple=20
    Programs<BR><BR></DIV></FONT>
    <DIV><FONT size=3D2>To those who are using, or have used,=20
    oversized&nbsp;EPROM's that contain more than one program=20
    image........</FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2>Can you simply select between say Program =
&quot;A&quot;=20
    and&nbsp;Program &quot;B&quot; while on the fly, or do you have to=20
    power/idle down and then switch from one to the other?&nbsp; This =
would be=20
    for a two program solution in place of a single 27c256b =
chip,&nbsp;for a=20
    friend who has&nbsp;new young drivers in the family (think of it as =
a sort=20
    of valet mode).&nbsp; Is more than 2 images a big hassle in place of =
a 256=20
    chip?&nbsp; The selector switch would be a keyed Allen Bradley=20
    jobbie.</FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2>Anyone have any&nbsp;interesting tidbits =
archived on this=20
    topic, on their HD's, that they can pass along?&nbsp; I'm going to =
dive into=20
    the list archives over the next few nights, but any=20
    direct&nbsp;pointers&nbsp;would certainly help a bunch.</FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2>Walt.</FONT></DIV></BLOCKQUOTE></BODY></HTML>

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