ROUTING
| Code | Name | Earliest evidence | Confidence | Files |
|---|---|---|---|---|
| M126 | 1968|1 | estimate | 2 | |
| M454 | Slate Assign Module | 1974|7 | high | 16 |
| M455 | Auxiliary Module | 1974|7 | high | 53 |
| M456 | Dual Mixdown Module | 1975|8 | low (named by) | 17 |
| M456B | Dual Mixdown Module | 1975|8 | high | 63 |
| M457 | Pre-Mixer Module | 1975|8 | high | 138 |
| M457A | Pre Mixer Master Module | 1975|8 | high | 24 |
| M459 | VIDEO FOLLOW FILTER SELECTOR SCHEMATIC | 1976|9 | high | 40 |
| M468 | High Level Switcher | 1970|3 | high | 53 |
| M468A | 1970|3 | family | 2 | |
| M468AN | Routing Switcher Module | 1970|3 | family | 3 |
| M468M | 1976|9 | high | 5 | |
| M498 | Stereo Setector | 1977|10 | low (in use by) | 103 |
| M498A | 10 X 1 Selector | 1984|17 | low (in use by) | 6 |
| M538 | Aicw 8x1 Stereo Switcher | 1985|18 | high | 68 |
| M538C | 1985|18 | low (named by) | 17 | |
| M559A | 1995|28 | estimate | 18 | |
| M568 | Assignment Module | 1985|18 | high | 6 |
| M568N | 1995|28 | low (named by) | 14 | |
| M568P | 1995|28 | low (named by) | 24 | |
| M568Q | Stereoassignment Module | 1995|28 | low (named by) | 16 |
| M568W | 1985|18 | estimate | 4 |