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TTY DEFCHAR - Revision history
2026-05-02T18:45:59Z
Revision history for this page on the wiki
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https://wiki.vmssoftware.com/index.php?title=TTY_DEFCHAR&diff=1006&oldid=prev
Darya.zelenina: Created page with "'''TTY_DEFCHAR''' is a system parameter that sets the default characteristics for terminals, using a code derived by summing the following h..."
2019-07-02T08:58:57Z
<p>Created page with "'''TTY_DEFCHAR''' is a <a href="/System_Parameters" title="System Parameters">system parameter</a> that sets the default characteristics for <a href="/Terminal" title="Terminal">terminals</a>, using a code derived by summing the following h..."</p>
<p><b>New page</b></p><div>'''TTY_DEFCHAR''' is a [[System Parameters|system parameter]] that sets the default characteristics for [[Terminal|terminals]], using a code derived by summing the following hexadecimal values:<br />
<br />
{| class="wikitable"<br />
! colspan="col" | Characteristic<br />
! colspan="col" | Value (Hex)<br />
! colspan="col" | Function<br />
|-<br />
| PASSALL<br />
| 1<br />
| Passall<br />
|-<br />
| NOECHO<br />
| 2<br />
| Noecho mode<br />
|-<br />
| NOTYPEAHEAD<br />
| 4<br />
| No type-ahead buffer<br />
|-<br />
| ESCAPE<br />
| 8<br />
| Escape sequence processing<br />
|-<br />
| HOSTSYNC<br />
| 10<br />
| Host can send XON and XOFF<br />
|-<br />
| TTSYNC<br />
| 20<br />
| Terminal can send XON and XOFF<br />
|-<br />
| SCRIPT<br />
| 40<br />
| Internal use only<br />
|-<br />
| LOWER<br />
| 80<br />
| Lowercase<br />
|-<br />
| MECHTAB<br />
| 100<br />
| Mechanical tabs<br />
|-<br />
| WRAP<br />
| 200<br />
| Wraparound at end of line<br />
|-<br />
| CRFILL<br />
| 400<br />
| Perform carriage return fill<br />
|-<br />
| LFFILL<br />
| 800<br />
| Perform line feed fill<br />
|-<br />
| SCOPE<br />
| 1000<br />
| Terminal is a scope<br />
|-<br />
| REMOTE<br />
| 2000<br />
| Internal use only<br />
|-<br />
| EIGHTBIT<br />
| 8000<br />
| Eight-bit terminal<br />
|-<br />
| MBXDSABL<br />
| 10000<br />
| Disable mailbox<br />
|-<br />
| NOBRDCST<br />
| 20000<br />
| Prohibit broadcast<br />
|-<br />
| READSYNC<br />
| 40000<br />
| XON and XOFF on reads<br />
|-<br />
| MECHFORM<br />
| 80000<br />
| Mechanical form feeds<br />
|-<br />
| HALFDUP<br />
| 100000<br />
| Set for half-duplex operation<br />
|-<br />
| MODEM<br />
| 200000<br />
| Set for modem signals<br />
|-<br />
| PAGE<br />
| FF000000<br />
| Page size. Default is 24<br />
|}<br />
<br />
Do not set the CRFILL or LRFILL characteristic as the default in TTY_DEFCHAR.<br />
<br />
Where a condition is false, the value is 0.<br />
<br />
The upper byte is the page length. The default characteristics are 24 lines per page, terminal synchronization, wraparound, lowercase, scope, and full-duplex.<br />
<br />
[[Category:System Parameters]]</div>
Darya.zelenina