As you may have seen in my previous post, my Kawai R-100 Drum Machine came with a 3-EPROM “soundswitcher”. Since this is no longer available, I thought I would make my own. It’s not an exact clone of the Drumware Inc board. First, I used different logic … just a personal choice. Second, I eliminated the ribbon cable to cut down on cost. It looks like there is just enough vertical room to pop the board on top, so that’s what I did. In my unit the Kawai ribbon cables are such a mess that it’s hard to close up the lid already. Finally I did a 2-layer board compared to the old Drumware single-layer board that was probably taped up by hand. In fact this is how I used to make SRAM memory expansions myself in the late 80’s. I even advertised them in the back pages of Polyphony magazine (for JX3P, OB DX, Polysix and a few others).
Kawai R100 ROM Switcher
Kawai R100 EPROM Switcher Installed
Kawai R-100 Drum Machine Front showing the switch
I also silk-screened the pin information on the top.
Read my previous post for more background info.
GB
By the way, I may make a kit at some point, but I don’t have all the parts gathered yet.
I’d love a kit. I have 2 r100s.One has the expansion,one doesn’t. The expansion never worked fully, figured the EPROM was screwed.
Hi Was just wondering if you have any of these boards still avaliable?
hi,
do you sell or trade these boards? i’ll be interested in 5pcs – as i own 7 R-100. : )
roman
Yes I make these 3X switchers as well as a 4X variation. I have them on eBay.
http://www.ebay.com/usr/grantmtg
I don’t usually have 7 made at a time, but we could work something out if you want to email me.
GB