Fatter Agnes (1 Meg)
I recently tried to install the Fatter Agnes (1 meg) chip in my Amiga 500.
I cut the trace on J2 and bridged the solder pads as directed. Then bent up
pin 32 on the Gary chip… also as directed. Got everything back together
and powered up. Ran a diagnostic and was told I now had 1 meg of chip ram
and no fast ram… that's the fact since my Amiga only had a meg of memory
to begin with. However, when I tried to run various programs with graphic
screens, I got a mess. It looked like the images were streaking and
bleeding all over the screen…. persistance of images one on top of
another. I checked and rechecked everything and can't find my mistake. I
pulled out the Fatter Agnes and put the old Fat Agnes back. Then
re-soldered the jumper and replaced pin 32 on the Gary chip. Everything is
running again as it did before; so I caused no major damage.
However, my diagnostic program says the _Blit failed its test (both with
the Fat Agnes and the Fatter Agnes installed.) I received an error code of
726 and 730 on various runs of the diagnostic program. This may or may not
be involved. I just don't know.
Mike Hanson