A new sort of Bend to try

[sensor]

oceanus?

[Oceanus - XD515]

Hi,
Sorry I missed your last post.

I connected the test pin to the Perc audio out ( pin 97 ).
Here is a complete list of all the SK-1 / 5 CPU pin details:

CASIO SK series CPU chip pin details         

Pin(s)   Name   IO   What it does
1   BGND   Supply   Ground or 0V supply for the A/D within the CPU
2   VACD   Supply   Neg 5v Supply for the A/D within the CPU
3   W-Noise   unknown   W-noise pin Currently not used on the SK-1
4   M-Noise   unknown   M-noise pin Currently not used on the SK-1
5-11   IO0 - IO6   Bi Direct   7 data bus lines used to send / receive data from ROM and RAM
12   A0   Out   Part of Address bus - A 0
13   IO7   Bi Direct   Remaining 8th line for Data bus ( see pins 5-11 )
14   A1   Out   Part of Address bus - A 1
15   CE   Out   Chip enable signal for the CPU to select either ROM or RAM
16-18   A2,A10,A3   Out   Part of Address bus - A2, A10, A3
19   OE   Out   Output Enable signal to allow the RAM to put data onto data bus
20-30   A4-9, A11-15   Out   Rest of Address bus A4-A9 and A11 - A15 (sixteen lines in total )
31   WE   Out   Write Enable signal. When Low the CPU writes data to the RAM
32   RFSH   Out   Refresh Signal output. When Low the CPU refreshes Ram
33   TIN   In   Not used on SK-1 Pulled to VDD2, maybe a Test pin
34   TC0   In   Not used on SK-1 Pulled to VDD2, Some sort of bit input
35   TC1   In   Not used on SK-1 Pulled to VDD2, Some sort of bit input
36   TOUT   Out   Not used on SK-1 Pulled to VDD2, Something to do with TC0 and TC1
37   ADCTR   In   Not used on SK-1 Pulled to VDD2, Something to do with internal A/D
38   WE   Out   Write enable signal, not used on SK-1 but for driving extra devices
39   CE   Out   Chip enable signal, not used on SK-1 but used on SK-5 to drive Percussion Chip
40   GND   Supply   0V supply for the CPU
41   CE2   Out   2nd Chip enable Signal, unused on SK-1 but used on SK-5 to drive Demo Rom Chip
42   TEST   In   Test pin, worth experimenting with!
43   VDD1   Supply   Neg 5v Supply for the CPU
44   VDD2   Supply   Used to connect the Unused pins to a voltage source Internal analogue Ground
45   POFF   unknown   Power Off? Not used on the SK1 or SK5
46   C1   Out   Not used on SK-1, left floating but used on SK-5 as clock for Demo Rom
47   C2   Out   Not used on SK-1, left floating but used on SK-5 as clock for Demo Rom
48   OP   Out   Not used on SK-1, left floating but used on SK-5 to select between data / address on Demo Rom
49-56   Aux D0 - D7   Bi Direct   Secondary data bus D0 - D7. Unused on SK-1 but drives SK-5 percussion Chip / Demo Rom
57   OSI   In   Master clock oscillator inputs for 7.24Mhz oscillator
58   OSO   Out   Master clock oscillator output for 7.24Mhz oscillator
59   MI   In   Not used on SK-1, left floating but used on SK-5 as input for Power on Detector circuit
60   RESET   In   Reset in put signal. Pulsed high it will initialize the CPU
61   K015   Out   Control signal for external filter circuit, not used on the SK-5
62   K014   Out   Not used on SK-1 but determines Accomp volume control signal on SK-5
63   K013   Out   Not used on SK-1 but used as RAM / ROM select signal on SK-5
64   K012   Out   Not used on SK-1 but used as Auto Power of signal on SK-5 ( pin 86 om SK-1 )
65-76   K011 - K0   Out   Key Out signals used to scan the Keyboard and Buttons (K011, K010 unused on SK-1)
77-84   KI1 - KI8   In   Key and switch input signals
85   PO0   Out   Not used on SK-1 but used as a Reset signal for SK-5 percussion Chip
86   PO1   Out   Auto Power Off, when Low switches off the power supply. ( cut this to keep power on )
87   PO2   Out   Unused IO pin for both SK-1 and SK-5
88   PO3   Out   Control signal for external filter circuit, not used on the SK-5
89   EH   Out   Analogue Envelope control signal for Melody channel ( CH1 )
90   EG   Out   Analogue Envelope control signal for Obbligato channel ( CH2 )
91   EF   Out   Analogue Envelope control signal for Chord channel ( CH3 )
92   EE   Out   Analogue Envelope control signal for Bass channel ( CH4 )
93   SH   Out   Analogue Audio Pitch signal for Melody channel ( CH1 )
94   SG   Out   Analogue Audio Pitch signal for Obbligato channel ( CH2 )
95   SF   Out   Analogue Audio Pitch signal for Chord channel ( CH3 )
96   SE   Out   Analogue Audio Pitch signal for Bass channel ( CH4 )
97   SC   Out   Analogue Audio output for Percussion sounds, not used on SK-5
98   AGND   Supply   Ground or 0V supply for the D/A within the CPU
99   VDAC   Supply   neg 5v source for D/A within the CPU
100   VIN   input   Sample sound data enters the CPU here

Hope this is useful!

Cheers

Paul

[mikebike]

FIRST POST! (awesome forum everyone!)

i just started the drum mutator mod, with the 8bit bus.

i was wondering, would it be possible to use an inverter chip to change the state of the bits?

so 01100110 = 10011001?

possibly, we could use a switch at each pin to decide weather its inverted or not?

i dont knwo anything about digital logic, but from what ive read i thoguht it might be interesting

keep up the good work!

[Gordonjcp]

You could do.  If you use a pair of quad XOR gates, you can see how you could use a switch to flip between inverting and non-inverting.

[mikebike]

i did a pictorial of this mod on the EA forum:

http://experimentalistsanonymous.com/board/index.php?topic=2528.msg13531#msg13531

hope this helps anyone having trouble

[Simon Vactrol]

Great!! thanks Paul!
Gonna go mark 2 on my SK5 tomorrow!!
and give a go to those modifications.



Simon.

[mikebike]

not paul, im mike, haha

im working out the inveter thing, witch i hope will be as versitle as the patch cables, with out the need for cables.

thinking about a hex shmitt trigger with switches and possibly some gate circuittry. keep ya posted