>
> The 2 RAM chips duties aren't divided separately - they share the sampling, and also pattern and song data and settings as if they were one 128k chip. In the day it was made, one 128k chip was probably a fair bit more expensive than two 64k chips, so it would have been those reasons they used 2 chips.
>
> You will need to swap both chips for two 4MBit chips in this case. I did the same thing with my Alesis MMT8 expansion, which also has 2 chips, in the same way, and it works great.
>
> Switching the extra lines - yes you could just use toggle switches. Each switch connects to each same pin of each chip in parallel, so they switch the same line on both chips at the same time.
>
> Using an encoder to toggle the 4 extra address lines is the more elegant way but in the end the 4-bit rotary encoder is just 4 toggle switches in a convenient package. You can buy those 4-switch banks DIP switches for circuit boards for very cheap like these if it's neatness or compactness you need:
>
> http://au.element14.com/grayhill/78b04t/switch-dil-slide-4way/dp/9479040
>
> But I really like the rotary encoder because it displays a number that tells me directly what bank I'm in, rather than switch positions. And it sits flush with the surface of the RZ, rather than switches to get bumped, if you use normal toggle switches.
>
> Cheers, Graham
>
>
> --- In casiocollectors@yahoogroups.com.au, "likewhatisay" <k-vin@> wrote:
> >
> > Hey Graham, I've been thinking more about the SRAM upgrade you suggested for my RZ-1 and had a couple questions for you.
> >
> > The stock sampling RAM is a D4364C-15L = 64kbit (8bit x 8k) and there are 2 of them, I assume arranged like this for the 2 separate volume sliders/banks.
> >
> > I'm quadrupling the ROM and had initial thought to do the same for the SRAM's to simplify switching(tie it in the the ROM switching).
> >
> > I'm interested in increasing it to 4MB like you suggested but I'm a little unclear about switching in the extra address lines. Is it pretty straight forward, i.e., wire up a toggle in between the extra lines? Would I need a lot of toggles to address all the extra space, especially if I increased both chips? Should I just increase one chip? Any other somewhat elegant options? Maybe an encoder like you used for your DM100.
> >
> > Thanks a mil for any help.
> >
> > K
> >
> >
> > --- In casiocollectors@yahoogroups.com.au, "Graham" <gmeredith1@> wrote:
> > >
> > > $3.56 to be exact!!
> > >
> > > http://www.newark.com/alliance-memory/as6c4008-55pcn/sram-4mb-2-7v-5-5v-512kx8-pdip32/dp/94M6217?Ntt=AS6C4008-55PCN
> > >
> > > Cheers, Graham
> > >
> > >
> > >
> > > --- In casiocollectors@yahoogroups.com.au, Kev! <k-vin@> wrote:
> > > >
> > > > Good idea Graham. More is better, so why not? It's not like the 4MB's cost much more right :)
> > > >
> > > >
> > > > On Mar 7, 2013, at 5:53 PM, "Graham" <gmeredith1@> wrote:
> > > >
> > > > > You could easily drop in the 4Mbit and do the same too, seems kind of a waste not to.
> > > > >
> > > > > You could arrange it so that the same address lines on the 4Mbit SRAM as the 1MBit SRAM are connected to the rotary encoder and switched the same with the ROM banks like you mentioned. Then to access extra sampling banks, have 2 toggle switches that switch in the extra 2 address lines.
> > > > >
> > > > > In this fashion, you could have your ROM 1 bank as say, a 909 kit plus 4 samples, ROM 2 an 808 kit plus 4 samples, ROM 3 a Linn plus 4 samples, ROM 4 an RZ plus 4 samples. And then by switching combinations of the 2 toggle switches, you will get 4 extra banks of 4 samples as other "variations" of the ROM kits. Like, if you had the 909 kit but you would like to have an 808 cowbell in the sample section of that kit, you could have your normal samplesassociated with that bank plus a variation sample bank with an 808 cowbell and 3 more sounds in one of the 4 extra sample banks.
> > > > >
> > > > > Cheers, Graham
> > > > >
> > > > > --- In casiocollectors@yahoogroups.com.au, Kev! <k-vin@> wrote:
> > > > > >
> > > > > > I most likely will roll my own .bin's depending on how much I like the exfade version that you mentioned. I mean, what fun is having an eprom burner if you're not going to make your own :)
> > > > > >
> > > > > > As far as the sample memory, it will turn into 4 banks of 4 when you swap the two stock 256k chips for the 1megs. A 4013 ic is used to do the bank switching for both chips simultaneously with a 4-way rotary. So for instance you get a 909 kit + 4 samples, turn the dial... 808 kit + 4 samples, etc. You could however set the sample banks to switch independent of the kits if you prefer it that way, which I may look into.
> > > > > >
> > > > > > k
> > > > > >
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > From: "Graham" <gmeredith1@>
> > > > > > To: casiocollectors@yahoogroups.com.au
> > > > > > Sent: Wednesday, March 6, 2013 6:28:02 PM
> > > > > > Subject: [casiocollectors] Re: RZ-1 Bend points?
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > Are you going to ROM your own sounds, or just use the ROM images that are available of TR808/909 and Linn drum sounds for it for this purpose? What chip were you going to do the sampling expansion with?
> > > > > >
> > > > > > Cheers, Graham
> > > > > >
> > > > > > --- In casiocollectors@yahoogroups.com.au , Kev! wrote:
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > Yeah, I plan on putting in some 1 meg roms for both the internal sounds and sampling and I do have the switching diagram for that, if and when you need it.
> > > > > > >
> > > > > > > Keep me in mind if you find a manual, I'll do the same.
> > > > > > >
> > > > > > > Thanks, Kev
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: "Graham"
> > > > > > > To: casiocollectors@yahoogroups.com.au
> > > > > > > Sent: Wednesday, March 6, 2013 5:48:59 PM
> > > > > > > Subject: [casiocollectors] Re: RZ-1 Bend points?
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > The Circuitbenders.co.uk group have lots of info on RZ bending and also ROM expansion:
> > > > > > >
> > > > > > > http://www.circuitbenders.co.uk/forum/
> > > > > > >
> > > > > > > I've been wanting to get anRZ for a while now and do some mods to it too (of course, do a 16x sample expansion on it too!)
> > > > > > >
> > > > > > > I'm planning on getting the RZ service manual soo, but no one sells it in pdf form - they all have it in paper copy.
> > > > > > >
> > > > > > > Cheers, Graham
> > > > > > >
> > > > > > > --- In casiocollectors@yahoogroups.com.au , "likewhatisay" wrote:
> > > > > > > >
> > > > > > > > Hi All, Can anyone kindly suggest any 'musical' bending points for the RZ-1 drum machine?
> > > > > > > >
> > > > > > > > I'll be setting up some rotary switches for some dataline bends but wondered if anyone had some other points for muffling, timing, body-contact, etc.
> > > > > > > >
> > > > > > > > I didn't want to go crazy with a patchbay, just some useful altering via a couple of six way dials with some trimmers if needed and body contacts if possible (just have to be careful with the AC).
> > > > > > > >
> > > > > > > > A schematic would be a god send.
> > > > > > > >
> > > > > > > > Cheers.
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > >
> >
>
