sander
_
Van de 707 mailinglist komt de volgende info. Je kan dus de samples van de 626 vervangen.
Hi folks,
I'm pretty new to circuit-bending, although I've been building,
repairing and modifying electronic equipment for a while now. I was
pretty interested to read http://burnkit2600.com/gear/?p=24 - a page
about the TR-626, because I've got one of these.
My new EPROM programmer arrived on Saturday, so I set about making up
new Simmons and Drumtraks ROMs - all good and well but what about the 626?
Well, it turns out that the ROM is a plain ordinary JEDEC
mask-programmed 2Mbit ROM. The samples are 8-bit unsigned linear, and
the sample playback is via a simple resistor ladder. Easy, eh? No.
The address lines are mixed up in a complicated manner, so it's not
just a case of going through the ROM and picking out the bits you
want. However, with a bit of thought I was able to hack together a
rather crufty bit of C which will straighten out the ROM address mapping.
I've put a .zip file with a raw dump of the ROM, and the decoded
version: http://static.nekosynth.co.uk/tr626.zip
Now if you can decode the ROM, you can encode other samples to fit
into the ROM, right? Well yes, of course! So, here it is,
href="http://static.nekosynth.co.uk/tr628.zip - a
ROM set with some of the samples replaced with TR808 samples.
You'll need a 2Mbit EPROM or FLASH chip to blow the file "tr628.bin"
into, although a 1Mbit would do at a pinch (I'm using a 1Mbit just now).
Have fun, and be careful!
Gordon
Hi folks,
I'm pretty new to circuit-bending, although I've been building,
repairing and modifying electronic equipment for a while now. I was
pretty interested to read http://burnkit2600.com/gear/?p=24 - a page
about the TR-626, because I've got one of these.
My new EPROM programmer arrived on Saturday, so I set about making up
new Simmons and Drumtraks ROMs - all good and well but what about the 626?
Well, it turns out that the ROM is a plain ordinary JEDEC
mask-programmed 2Mbit ROM. The samples are 8-bit unsigned linear, and
the sample playback is via a simple resistor ladder. Easy, eh? No.
The address lines are mixed up in a complicated manner, so it's not
just a case of going through the ROM and picking out the bits you
want. However, with a bit of thought I was able to hack together a
rather crufty bit of C which will straighten out the ROM address mapping.
I've put a .zip file with a raw dump of the ROM, and the decoded
version: http://static.nekosynth.co.uk/tr626.zip
Now if you can decode the ROM, you can encode other samples to fit
into the ROM, right? Well yes, of course! So, here it is,
href="http://static.nekosynth.co.uk/tr628.zip - a
ROM set with some of the samples replaced with TR808 samples.
You'll need a 2Mbit EPROM or FLASH chip to blow the file "tr628.bin"
into, although a 1Mbit would do at a pinch (I'm using a 1Mbit just now).
Have fun, and be careful!
Gordon
Daarnaast uiteraard wel heel leuk dat je voor een beperkte prijs toch even snel een 808 kitje mee kunt nemen voor onderweg oid.
