bgribble@jarthur.Claremont.EDU (Bill Gribble) (02/28/90)
I think I have just succeeded in hopelessly flailing a minor hardware project.
Maybe someone out there can tell me what went wrong, if I can fix it, and
a source for psychotherapy in the case that I can't fix it:
I bought a SupraDrive interface (I have a 500) with 2 megs of ram to
expand my vanilla 1 meg amiga. My thought was to run with the memory
until I got enough money for a drive, then add it to the scsi interface
I already had. I neglected to consider that the memory needed the
hard drive's power supply to run. Anyway, after beign thoroughly
p***ed off by Supra's tech support, I decided to build a power
supply of my own. The manual said the memory needed 5v, 1A to run,
so, to make a long story short, I built it: steady at ~4.95v, nice
flat voltage on the oscilloscope. Pretty robust, too; it's capable of
about 2A.
So I plug it in the expansion bus, flip it and the amiga on...
Blinking power light. Off... on... Blink... blink...
After another try, it booted fine, but just showed my original 1 meg.
So what's up? I'd appreciate any advice. One thought I'm having is
that the interface is telling the amiga there's a drive there when
there's not, so problems occur. But someone where I bought the mem
said he'd told people how to do the project before. Oh well.
Thanks in advance.
Bill Gribble
bgribble@jarthur.claremont.edu