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2002-11-07 20:50

fermhg
Account closed

Registered: Oct 2002
Posts: 43

Hearing music using the Datassette

I remember, a long time ago I had a program for the Commodore 64 with which I could hear music or any sound recorded in a cassette through the Datassette and the monitor, passing, clearing is, for the c64. It was, I remember, a program that left the screen in white, I imagine in order to give priority to the SID and to the Datassette. The thing worked, clearing is, to a level of very poor sound, but with an important effect: I could hear my favorite music through the Commodore 64.
Does somebody know how to program something like this? Does somebody have this program?
Thank you,

fermhg

2002-11-08 08:44

algorithm

Registered: May 2002
Posts: 707

I had created a sample recording utility which uses the datasette.

Very easy really, As far as I remember, a memory location is read while the audio tape is playing. If the signal on the tape is above a specific level (or something like that!) a bit is set on the location. Unfortunately not surprisingly, the recorded sample is 1 bit only! (The major advantage is that you can store 8 samples in 1 byte!

As far as I am aware, I had submitted this program to Binary Zone PD nearly 10 years ago! Contact Kenz for more details. The program was released under the 'Fantasys' label!

2002-11-17 20:35

iopop

Registered: Dec 2001
Posts: 317

Given that the datasette will operate. ie. no other code have put it off. This code will give you sound in your monitor.

LDX #$00
STX $D011
SEI
LOOP LDX #$00
LDA $DC0D
AND #$10
BEQ NOSND
LDX #$0F
NOSND
STX $D418
JMP LOOP

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