Quantum Data 881 User Manual page 877

Other required
commands
Example
882 Video Test Instrument User Guide (Rev A.35)
The FMTU command instructs the generator to use the new setting. The
updates hardware to the new setting and redraws the test image.
VTOT 525 // Set total lines//frame to 525 in buffer
FMTU // Update hardware to current buffer contents
ALLU command
849