The ISA 828 has eight balanced analogue outputs which are transmitted via a 25-pin connector that utilises the DB-25FM/AES59 (Tascam) pinout, as follows:
| Pin | Signal |
| 1 | Channel 8 + |
| 14 | Channel 8 - |
| 2 | Ground |
| 15 | Channel 7 + |
| 3 | Channel 7 - |
| 16 | Ground |
| 4 | Channel 6 + |
| 17 | Channel 6 - |
| 5 | Ground |
| 18 | Channel 5 + |
| 6 | Channel 5 - |
| 19 | Ground |
| 7 | Channel 4 + |
| 20 | Channel 4 - |
| 8 | Ground |
| 21 | Channel 3 + |
| 9 | Channel 3 - |
| 22 | Ground |
| 10 | Channel 2 + |
| 23 | Channel 2 - |
| 11 | Ground |
| 24 | Channel 1 + |
| 12 | Channel 1 - |
| 25 | Ground |
| 13 | Not used |