test

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

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