TTY DEFCHAR
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TTY_DEFCHAR is a system parameter that sets the default characteristics for terminals, using a code derived by summing the following hexadecimal values:
| Characteristic | Value (Hex) | Function |
|---|---|---|
| PASSALL | 1 | Passall |
| NOECHO | 2 | Noecho mode |
| NOTYPEAHEAD | 4 | No type-ahead buffer |
| ESCAPE | 8 | Escape sequence processing |
| HOSTSYNC | 10 | Host can send XON and XOFF |
| TTSYNC | 20 | Terminal can send XON and XOFF |
| SCRIPT | 40 | Internal use only |
| LOWER | 80 | Lowercase |
| MECHTAB | 100 | Mechanical tabs |
| WRAP | 200 | Wraparound at end of line |
| CRFILL | 400 | Perform carriage return fill |
| LFFILL | 800 | Perform line feed fill |
| SCOPE | 1000 | Terminal is a scope |
| REMOTE | 2000 | Internal use only |
| EIGHTBIT | 8000 | Eight-bit terminal |
| MBXDSABL | 10000 | Disable mailbox |
| NOBRDCST | 20000 | Prohibit broadcast |
| READSYNC | 40000 | XON and XOFF on reads |
| MECHFORM | 80000 | Mechanical form feeds |
| HALFDUP | 100000 | Set for half-duplex operation |
| MODEM | 200000 | Set for modem signals |
| PAGE | FF000000 | Page size. Default is 24 |
Do not set the CRFILL or LRFILL characteristic as the default in TTY_DEFCHAR.
Where a condition is false, the value is 0.
The upper byte is the page length. The default characteristics are 24 lines per page, terminal synchronization, wraparound, lowercase, scope, and full-duplex.
