Quantum-data 801GC Uživatelský manuál stáhnout pdf (Strana 182)

6-56 Chapter 6: Programming

Model 801GC, 801GF & 801GX¥Rev. A

The frame rate is equal to HRAT divided by VTOT.

This should match the frame rate given on your spec

sheet.

Active Video Physical Size

The USIZ, HSIZ and VSIZ parameters do not affect

the sync timing or signal outputs of the 801G*. They

do, however, greatly affect the test images that are

drawn. For example, the size of the box in the “Bright-

ness” test pattern should match the size of your light

meter probe. The actual size of the probe is entered

using the system parameter MSIZ. The firmware com-

bines this information along with the format’s physi-

cal size information to properly scale the size of the

box. The firmware also uses the format’s size infor-

mation to make sure the crosshatch lines in the SMPTE

RP-133 pattern form square boxes and that the circle

is round and not elliptical.

The USIZ parameter determines whether the unit of

measure will be interpreted as inches (1) or in mm

(2).

The HSIZ parameter is the horizontal width of the

active video area on a properly adjusted display.

The VSIZ parameter is the vertical height of the active

video area on a properly adjusted display.

❖ Changing the values of HSIZ and (or) VSIZ will

not change the overall size of most test images

on your display.

Display Codes

Many video controller cards for the Apple Macin-

tosh II and VGA type cards for the IBM-PC are able

to identify the type of display connected to them by

checking one or more display code sense lines com-

ing from the display. The information is then used

to select one of several different operating modes to

match the display. An improper display code may

make the controller card or display appear to be

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Quantum-data 801GC Uživatelský manuál Strana 182