--- In tr-707@yahoogroups.com , Nicholas Gregorich <nicksdsu@...> wrote:

>
> Hello Thierry, and nice to meet you.
>
> Congratulations on reading these ROMs! It is indeed a big job. I
> built an EPROM reader for myself and was able to get what seemed like
> valid data out of the TR-727's ROMs. Though at the time I just made
> it read the data over serial to a terminal window, as I didn't know
> that there were Intel hex -> u-LAW converters so I could open the
> file in a wave editor.
>
> Did you read data from the 2 least significant bits of the ROMs (D0
> and D1) I did and as I remember there was data on these 2 bits even
> though the pins are not used in the TR-727. Of course with the u-LAW
> encoding there isn't much significance of those bits in a drum hit.
>
> I also think its a good idea to write to larger ROMs for extra sound
> banks. At least to have both 707 and 727 in 1 box. Making new
> sample banks would be interesting but would probably require pitch
> modification of the drum machine (or lots of wave editing).
>
> I will let you and the group know if I find time to write new ROMs.
>
> Happy New Year!
>
> Nick.
>
> On Jan 1, 2007, at 3:10 PM, ttete500 wrote:
>
> > Hello and Happy New Year!
> >
> > My name is Thierry EPPHERRE,I am an electronician and I am collecting
> > old drum modules (SIMMONS, DDRUM,PEARL,TAMA,DYNACORD.....)
> > This afternoon I was working on reading Sounds Roms on my TR707:I
> > have now binaries of theses Roms and I think I will be able to burn
> > my own samples on EPROMS to replace sounds.
> > Like you know it is a very big job:
> > + dessoldering the 4 Roms
> > + make an adaptator to read IC22 (Ride) on my DIY Eprom reader--
> > > 32Ko bin
> > + make an adaptator to read IC19 (Crash) on my DIY Eprom reader--
> > > 32Ko bin
> > +Soldering pin to pin IC35 on IC34 to read the resultant 64Ko
> > Rom with an other adaptator on my DIY Eprom reader-->64Ko bin
> >
> > Datas pin were not swapped but address were swapped and also /OE
> > (pin 26 instead of 22 or 20)
> > But the more difficult:the CE line that is active at high level
> > instead of low level need to be pulsed by the clock of my eprom
> > reader to enable outputs of the ROMs!!!!!
> > Now I have 3 binaries and I can see the result on Cool Edit.
> >
> > The samples are organised like they say on the TR707 Service Manual.
> > I think the better will be to burn new samples on standart 27C256 for
> > the Ride and an another 27C256 for the Crash and on a 27C512 to
> > replace IC34 & IC35.We'll just have to connect each pin of each EPROM
> > to the correct adress,data,control ligne....
> > It should work.Why not using bigger EPROMs to select Drum kits with
> > mini dips
> > Sorry for my bad english,I am french.....
> > See you soon
> > Thierry EPPHERRE
> >
> >
> >
>

Salut thierry
je trouve ca exceptionnel ce que tu a fait
je voukais savoir si tu voulais bien partager ton experience en
faisant quelque photo de ton lecteur d'eeprom .
et si tu pouvais publier le shema de ton lecteur parce que j'aimerai
changer les sons de ma tr727 voir en rajouter
merci