This is a DOS based player of the ZSM format originally targeted for the Commander X16 platform.

The main purpose is to provide an example of how to use some of the features available on the TexElec SAAYM sound card which uses a Yamaha YM2151 and two Philips SAA1099 sound chips.

This includes:

• YM2151 detection.
• YM2151 clock speed detection.
• YM2151 timer-based playback via assigned IRQ.

If the SAAYM environment variable is defined, the player will use the settings defined there.

SET SAAYM=A210 I5 Y0 S0

• A - This is the address of where the SAAYM is configured for.
• I - This is the IRQ the SAAYM uses (if jumpered). If there is no IRQ defined, the system timer will be used.
• Y - 0 is for the YM2151 clocked at 3.579545 MHz, 1 is for the YM2151 clocked at 4 MHz.
• S - 0 is for the SAA1099s clocked at 7.15909 MHz (Game Blaster), 1 is for the SAA1099s clocked at 8 MHz.

• YM2151 clocked at 4 MHz frequency conversion.
• SAA1099 clocked at 8 MHz frequency conversion.
• VERA PCM playback.
• VERA PSG Pulse Width (SAA1099 natively lacks this feature).
• VERA channels; only the first twelve VERA channels are handled on the dual SAA1099 chips.

IBM PC or compatible MS-DOS 3.0 or higher 8088/8086 CPU @ 4.77 MHz or higher (for PCZSM16) 80386 or higher CPU (for PCZSM32) 256 KB RAM

PCZSM [options] FILENAME.ZSM

Where options can be:

• -rN Repeat N times (if the ZSM repeats). -r only to repeat forever.

The source is intended to be built with the Open Watcom compiler, though it may build with other compilers that can generate a DOS executable.

In the build output directory of choice type: wmake -f [path_to_makefile] [target]

Where target can be:

Attempts to adhere to the BARR-C:2018 Embedded C Coding Standard.