IBM RT PC Problem Determination Manual page 313

M odule-ID = VTMOUT RC = 6537
This error occurred during a request to change
indicators and the LPFKs are not attached, or
during a request to change granularities and
the dials are not attached.
M odule-ID = VTMOUT RC = 6544
The received VTD command is not valid in the
current operating mode of the virtual terminal
mode processor.
Module-ID = VTMOUT RC = 6546
The terminal ID passed via the change display
or the change font command is not valid.
M odule-ID = VTMSTS RC = 6563
This error occurred when set keyboard map
tried to change a key to a function with a
function ID greater than X'lFF' or to an
unsupported ID.
M odule-ID = VTMSTS RC = 6564
This error occurred when set keyboard map
tried to re-map one of the screen manager
designated keys.
M odule-ID = VTMSTS RC = 6566
This error occurred when set keyboard map
tried to re-map a key with an invalid position
code.
M odule-ID = VTMSTS RC = 6567
This error occurred because the KSR buffer
definition header is too small.
Module-ID = VTMSTS RC = 6568
This error occurred because the keyboard
buffer is too small.
Appendix B. Error Log Entries B-15