SERIAL SOUND CARD INTERFACE PROTOCOL
                                TRX-26-0003
                                16/03/2026
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TITLE:          SERIAL SOUND CARD INTERFACE PROTOCOL
ALSO KNOWN AS:  SSCIP
DOCUMENT ID:    TRX-26-0003
REVISION:       A2
CATEGORY:       DESIGN AND PROTOCOL
COPYRIGHTS:     (C) 2026 0x4248. CC BY-SA 4.0.
USAGE RIGHTS:   All rights given under CC BY-SA 4.0
LICENSE:        CC BY-SA 4.0

DATE CREATED:   16 March 2026
DATE REVISED:   16 March 2026

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REVISION HISTORY
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REVISION    DATE            NOTES
A1          16/03/2026      Initial creation of record.
A2          24/03/2026      Added file type section and notes

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CONTENTS
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1.0  INSERT
2.0  SIGNATURES

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ABSTRACT
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This TRX defines the sound card interface protocol which allows computer
programmers to communicate to a synthesizer without hassle. It is designed
to work with almost any system and with minimal resource usage 

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1.0  PROTOCOL
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1.1 CONCEPT

The SSCIP (Serial Sound Card Interface Protocol) should follow these simple
concepts:
- Allow the computer to send commands via serial
- Process the output signal on the sound card
- Use minimal drivers to get working

1.2 COMMANDS

Each command is ended with a new line. The SSCIP processor reads each line
taken in as separate commands

Square wave tone:
<HZ>\n
  
   #####   #####
   #   #   #   # 
   #   #   #   # 
####   #####   #####

Sine wave tone:
s<HZ>\n


###             ###          
   ##         ##   ##         ##
     #       #       #       #
      ##   ##         ##   ##
        ###             ###

Saw wave tone:
z<HZ>\n

#     #     #
 #   # #   # # 
  # #   # #   #
   #     #     #

Delay CPU:
d<MS>\n

NOTE: This also blocks signals from other sources on the same serial
connection

NOTE: This does not block the host computer CPU.

Note tone
$<MODE><NOTE>\n

Modes can be any of
- " " - (None) Will do a square tone
- s - Sine
- z - Saw

Note:
Any musical note from C0 to C10

Examples:
$C4
$A4
$zD3

1.3 Comments

You can add a comment by appending a # to the start of the line.

This can be useful for people sending a file into a device and put various
comments in to create sections.

1.4 File Type

Files that contain the notes or tones that are put into the sound card can 
be stored with the `.sst` extention (Serial Sound Tones) 

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2.0  SIGNATURES
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Written By:       4248 Systems / 0x4248       Date: 24/03/2026


Reviewed By:      _________________________   Date: __________
                
                  Signature: _________________________