🚀 go-pugleaf

In article <23027@watdragon.waterloo.edu> mwandel@tiger.waterloo.edu (Markus Wandel) writes:
>I need to find the circuit which can be used with the Amazing Computing
>piggyback memory hack to map the extra memory at $C00000.  The reason for
>this is weird.  The piggyback memory is in my machine, as is the address
>decoding hack, but I didn't put it there.  I paid someone the cost of the
>chips plus a bit extra to put it in for me.  This guy (hi Mark!) had done
>it so many times, he could have done it blindfolded, and he did a perfect job,
>but I never got a schematic for the extra address decoding.  He didn't have it.

I bought a used, keyboardless Amiga 1000 for $100 (and later got a keyboard for
$25, suprisingly enough) and was informed it had the piggyback hack inside it.
Since it seemed to autoconfig anyway, I accepted this and have a 512K machine 
which seems normal.  However, recently I've been trying to find a 256K expander
to put in since 768K would be nice... anyway, all the ones I've tried in the
little slot have not worked.  Is this just a huge coincidence or is there 
something about the hack that causes the 256K expander to fail?  I know nothing
about the hack itself, never heard of it before I got the 1000, don't know any
specifics like whether it has the address decoder (whatever that is). 

This does belong in c.s.a.hardware and I've directed followups there (I hope).
If anyone can tell me more about how I can add memory cheaply (people seem
to be selling these 256K boxes rather cheaply these days...) I'd appreciate it.

.                           <<<<Infinite K>>>>
 
Well, not quite...


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