Is this the same machine you broke the pin off the gate array On the
other note, do you really have 707 ROM's to donate Of course, I
really only need to borrow them 4 just enough time to make .bin dump's
to the computer. Are they already removed from the machine & which
machine are they comin' from

Funny thing about eprom's is they they have a life cycle of about
100,000 cycles. Eventually everyone's 707/727 (or any eprom drum
machine) is going to lose the sounds.....maybe all together, most
probably all random. Making copies, however, would allow the data to
be burned to new eproms or flash memory for replacment when that happens.

Thanks

Ryan


--- In tr-707@yahoogroups.com, JB Prater <philo_707@...> wrote:
>
> I have ROM chips to donate to this project, shoot me an email.
>   
>   OK, so on the chip transplant subject, I've been doing a lot of
that.  The fried 707 is working much better--to recap, first, I lost
the second sound in grouped sounds, then I lost everything but
kick/hitom/ride and they sounded all bent.  I fried a few chips, I
guess. 
>   
>   After swapping some chips, I now have all sounds except crash,
even both sounds in a paired set (came back after replacing IC29,
BTW).  But they sound bent (although recognizable).  Here's where it
gets interesting:  no crash -- I had a test pattern with a crash in
it, but it didn't sound -- then as I powered down I got a brief crash
as it turned off.  Where it gets really interesting:  the crash sound
was unbent, it sounded totally normal.  Odd, but seems to suggest that
something is wrong with a crash related chip, doesn't it   Anybody
have any ideas as to what to replace first  
>  
> 
>   
>   
>  
> plutoniq9 <Plutonique9@...> wrote:
>   Well, still waitin' on the eprom burner to get here from hong
> kong....is it wrong to wait this long for a bong to arrive from hong
> kong
>
> hehehe, just a lil' humor....
>
> But i haven't been idle. I programmed a VST module today that applies
> Mu-law compression/expansion algorithm to samples. It will be
> necessary to process all samples this way before gettin' them on the
> 707/727 because;
>
> -Samples have a lot of quantized noise (like aliasing) if they aren't
> compressed before converting them to 8-bit.
>
> -707, like most 80's machines, use a combination of compression +
> expansion on the samples (compansion), so it would sound real bad if
> they (samples) were burned in their native linear format, because the
> expansion would still be applied by the de-mux chips. That's thoses
> extra "envelopes" the schematics refer to, but they apply exponential
> envelopes to restore sample dynamics.
>
> Also, when ripping sounds off eprom's, I can apply mu-law expansion to
> them to restore their original dynamic content. This would be the most
> accurate way to extract samples from old eprom drum machines......
>
> I'm itchin' 4 this eprom burner to come, can ya tell Also, does no
> one have 707 eprom's to donate Some junk/parts boards out there I'm
> broke....so i can't just grab one from evil bay :) Also, still lookin'
> for v2.0 of the firmware.....maybe I'll drop a line to the AH/SDIY list.
>
> Seeya
>
> Ryan
>
>
>
>
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