Mailist to discuss all issues regarding the Digitech GSP-2101 Guitar FX Processor

Well, if I can't fix it, I will at least sell it for parts. It is
looking more and more like a memory access problem, once I get some
new parts in to swap out I will know. Could also be a bad decoder
chip, the logic analyzer shows no memory reads or writes occuring, the
Z180 boots up, trys the ram then gets stuck reading the eprom. Any
Z180 programmers out there?

--- In gsp-2101@yahoogroups.com, Adrian Teo <adrian.teo@a...> wrote:
> I'll buy it off ya! :)
> 
> -AT
> 
> 
> > -----Original Message-----
> > From: wulffert [mailto:mark@w...]
> > Sent: Friday, August 20, 2004 7:57 AM
> > To: gsp-2101@yahoogroups.com
> > Subject: [gsp-2101] GSP-2101 processor problem
> > 
> > 
> > I have working on my 2101 for several months on and off so far. I 
> > have v3.00 with the PPC installed (both are SDISC II). It has the 20 
> > MHz crystal with 10 MHz Zilog (even though schematic calls for 
> > hitachi). This unit one day decided to blow fuses (it only does this 
> > sporadically), turns out the current draw is at the threshold, I put 
> > a slightly larger fuse (I know a big no - no) but unit turns on and 
> > nothing gets hot, so other than a slightly elevated current, I can't 
> > find any shorted parts. Nothing works, front panel is all 8 8 8 and 
> > blocks on the LCD. No communication with foot controller. Looks like 
> > processor is running, I see acivity on address and data busses, on 
> > all lines. I never see the CS line go low to the memory, although it 
> > may at startup. Decoder chips seem to be ok. Anybody seen this before?
> > I even tried the old V2.02 firmware, pulling the battery, factory 
> > reset.
> > 
> > Mark 
> > 
> > 
> > 
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