# t-cascade command

The t-cascade command cascades or links
one tape device to another tape device, either in a chain or a loop.
Instead of prompting for the next reel, the system uses the forwardly
linked device specified. Tape attachment is not checked. This command
updates the links of the tape devices.

When all the devices have been used in a chain, the system
remains on the current device and prompts for the next reel, if necessary.
If the links are set up as a loop, the system never prompts for the
next reel. It is up to the operator to mount the next reel properly.

All tape drives involved in the cascade must be at the same block
size or be able to be changed to the starting drive’s block size automatically
by the system for the cascade to succeed. Remember, certain tape types
like floppy disk drives are limited in their block sizes available.

## Syntax

```
t-cascade device.num, device.num,...{options}
```

## Parameter(s)

| device.num | Number of devices specified. | |
| --- | --- | --- |
| options | c | Clears all links for the first device number specified or all devices if none is specified. |

## Example(s)

Tape device 6 cascades into tape
device 8 if the end of the reel is encountered on device 6. No prompt
for the next reel occurs.

```
t-cascade 6,8
```
Tape devices 2 and 3 are linked as a loop, 2 is linked
to 3 and 3 is linked back to 2.

```
t-cascade 2,3,2
```
Tape devices 2 to 5 are all linked or cascaded together.
Only, after device 5 is filled does the system prompt for the next
reel.

```
t-cascade 2,3,4,5
```
Clears the links associated with tape device 4. This device
prompts for the next reel when the EOT is reached.

```
t-cascade 4 (c
```

## See also

- [t-select command](https://d3codex.com/tcl/t-select-command/)

---
Source: https://d3codex.com/tcl/t-cascade-command/ - part of the D3Codex reference.