| system | main sound buffer | alternate sound buffer |
| Macintosh 128K | $1FD00 | $1A100 |
| Macintosh 512K | $7FD00 | $7A100 |
| Macintosh Plus, 1Mb | $FFD00 | $FA100 |
| Macintosh Plus, 2Mb | $1FFD00 | $1FA100 |
| Macintosh Plus, 2.5Mb | $27FD00 | $27A100 |
| Macintosh Plus, 4 Mb | $3FFD00 | $3FA100 |