Ro |
|
4 RSX-1lM/S - RSX-llM-PLUS Software Dispatch, September 1980 |
RSX-lIM V3.2 Seg 3.1.3.19 N |
DRIVERS
FDX-TTDRV 1 a 1 i

dl NOTE ON USING TERMINAL DRIVER SUBFUNCTION TF.RCU (SPR ll-26495 DD)

PROBLEM
STATEMENT

Terminal Driver subfunction TF.RCU does not work as described in the i
manval. |
[

RESPONSE |

Note that the restore cursor position subfunction (TF.RCU) will  oniy
work  correctly if the terminal driver knows the exact position of the
cursor. Although the driver attempts to accurately  maintain the
£ursor co-ordinates, nit is not always possible to accomplish this.
For example, if a task outputs a cursor positioning escape seguence,
the driver cannot interpret the  seguence to track the new Ccursor
location. Write-pass-all output is not tracked at all. In addition,
turning a terminal off and on may reset the cursor to home position
without the driver's knowledge. Before using the TF. RCU  subfunction,
to get back into synchronization, it is therefore best to use the
driver's cursor positioning feature (via the VFC parameter) to set
both the terminal and driver cursor co-ordinates to a fixed location.

29

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