"Scaryfield Manor"
Sound Card Modification
I was able to modify the Cowlacious ISD ChipCorder recorder and
player boards to play multiple sounds. These boards use the ISD
25xx chip and as designed only allow you to record one sound. The
only problem ith this mod is that
you have to fill the full time on the chip with sounds. The chip
doesn't start over at the first sound until it hits the end of the
chip. So if you have a 60 sec. chip you have to fill the full 60
sec. with multiple sounds. No real problem since you can repeat
the sounds or put some dead air after each sound to fill up
the chip.
You have to change 5 pins and add a 100k resister. I did this by using a 28 pin DIP socket between the onboard DIP socket and the chip. Pins 4, 7, 9, 10 and 24 have to be redirected. Depending on the socket they can be bent out of the way or filed down.
| - Pins 7, 9 and 10 have to connected to Vcc instead of ground. I wired them to pin 16. |
| - Pin 24 has to be connected to ground using a 100k resister. I connected the resister between pins 24 and 5. |
| - Pin 4 has to be grounded. I wired it to pin 5 (actually to the lead of the resister). |
This change disables the reset/norm switch which you don't really
need anymore. I left the long lead of the resister attached pin
24 in case I needed the reset. You just have to short pin 24 to
pin 28 to reset. The reset is only needed if you want to restart
at the first sound when you are part way into the set of sounds.
I found it easier to modify the DIP socket which had solid
pin posts but the mod can also be done to a DIP socket with flexible
pins. With the solid pins do the soldering first then cut off the
pin ends. I filed them down a little and applied some nail polish
to insulate the end.
Solid Pin DIP Socket
Flexible Pin DIP Socket
