Casio SA-2 (and rest of SA series?)

[Remork]

hi all

new here
just wanted to give something back for a couple of months' worth of lurking..

i've been looking over the collected info on bending the Casio SA series
and came up with this matrix, filled in the blanks poking around in an actual SA-2 specimen  
maybe i'm doing an old job all over again, but i couldn't seem to find this info anywhere.
so for those sensitive to spoiler alerts..

the action seems to lie in connecting pins 11-18 to pins 23-30.
i'll start from pin 30 as a common, since it's one of the outer pins and it begins at the lowest key..

so for the OKI M6387-11:

30 > 11, 12, 13, 14, 15, 16, 17, 18   (all keyboard semitones, going up)
29 >  "  (continued..)
28 >  "
27 >  "  (.. so 4x8 = 32 keys in all.)

26 > 11 = Pushbutton 1  (= 0 on SA-1) for sound selection.
26 > 12 = 2  
26 > 13 = 3
26 > 14 = 4
26 > 15 = 5 (first hidden one.)

26 > 16 = tempo up
26 > 17 = volume up
26 > 18 = rhythm (push any key to select)

25 > 11 = Pushbutton 6
25 > 12 = 7
25 > 13 = 8
25 > 14 = 9
25 > 15 = 10

25 > 16 = stop rhythm
25 > 17 = tempo down
25 > 18 = volume down

24 > 11 = bass drum trigger
24 > 12 = Snare
24 > 13 = Hi hat

24 > 14 = Demo 1 (jingle bells)
24 > 15 = Demo 2 (happy birthday)
24 > 16 = Demo 3 (waltz?)
24 > 17 = Demo 4 (twinkle twinkle little star)
24 > 18 = Demo 5 (alle menschen werden Brüder)

23 > 11 = open Hihat / cymbal
23 > 12 = Cowbell


this basically gives you access to all 100 sounds of the SA-1 (which happens to be one of my favourite keyboards   )
plus 5 drumsounds to trigger.
plus the digitally stepped volume control, plus 5 demo's - yeah whatever.


for my SA-1 things behave largely the same way, except for the lack of drumtriggers and only 1 demo, be it a verrrrry nice one indeed..  

OKI M6387-018
All of the above, except:

24 > 11 = Pushbutton 1 again
24 > 12 = 2 again
24 > 13 = 3 again
24 > 14 = 4 again
24 > 15 = 5 again
.. so no drum triggers..

24 > 16, 17, 18 = Demo 1 (wake me up before you go-go)

23 > ... not implemented.


if i ever get my hands on any SA series keyboards using other IC's (?), i'll try to update the list.
anybody wants to chip in, feel free.

hope somebody finds this useful.

[sk-1]

Very useful... Thankyou! 

I'm collecting as much data as possible before I rip open my SA-20.  I want to blow MY mind apart, not the SA's!

[Remork]

well, while we're at it..

the AN8053 amplifier chip that's in the SA-1/SA-2 (and others maybe?) sends out a regulated +5v voltage from pin #13, powering the larger OKI chip. if you follow the traces a little, you'll see the OKI is not connected straight to the battery +.
on both the SA-1 and 2 the power supply for the OKI sits on pin #10 - always useful info if you want to avoid blowing chips..

[jamiewoody]

i still am collecting components to bend me sa-2.

i was going to get them in my last order, but i had a hard time finding the crystal for the pitch bend mod. i would like to do all of the mods casper mapped out on his site, and try to do even more.

i am not sure if it will be this one, but i have decided to house a small keyboard, with tiny keys in an old silvertone radio case!

this old radio has this really cool geometry. very sharp angles! it's almost like seeing pictures in clowds! when i see something like this now, i tend to visualize other things it would be good as!  so, the speaker grill will become a control panel, the dial will be where the keyboard goes. and of course where the knobs are, other knobs can go! i'll give it a cool paintjob too!

[Remork]

cool. mine's going into an old Philips record player case, of which i'm hoping to reuse the speaker..
long term housing project i'm afraid 

[Remork]

okay.. Matrix picture for easy grasping: