Re: //e Enhancement Chips

[shack@crash.cts.com (Randy Shackelford)]

In article <3j2s25$rd1@athos.cc.bellcore.com>,
Jun-Gang Alin <jalin@iscp.bellcore.com> wrote:
>I was reading the Apple FAQ and with regards to "enhancing" an unenhanced ][e it
>says that certain "older" ][e can't be enhanced.  It gives examples of serial
>numbers that work/don't work but I am not clear since both serial numbers 
>look identical--except for a "B" suffix!
>
>Can anyone give more details on which ][e are incompatible with the enhancement
>chipsets?  Clues on the motherboard: presence/absence of chips, serial number
>range, etc.

Logic boards don't have serial numbers they have revision numbers. There are
two varieties which are candidates for the enhancement, 820-0064-A and 
820-0064-B. Revision A boards don't support DHR graphics, among other things.
Revision B boards work with the enhancement just fine. You find the revision
number on the back edge of the board, behind the slots.

To my knowledge any other revisions like 820-0087-A and the revision which is
is used in the grey //e are already enhanced.

>
>I am looking to enhance my Apple ][e but I want to make sure before I order the
>chipsets.  Also, any "cheap" sources?

I'd call around to dealers and see if they have any leftovers. Or get lucky
like I did when I found a rube with some Apple II hardware he picked up at
an Apple auction and wanted to unload it. I got an enhancement kit for $5,
a slinky memory card for $10, and a VOC for $25, all complete and new-in-the-
box.
--
Randy Shackelford                                Huh huh, that was cool.
shack@crash.cts.com