Theory of Operation
2715 Spectrum Analyzer Service Manual 3-45
Table3 - 8: Enhanced Mode MKRWFM[1.. 0] Bit Assignment
MKRWFM3 MKRWFM2 Marker 2 on Waveform...
00Waveform A
01Waveform B
10Waveform C
11Waveform D
UPDATED_L.This bit, when low, allows the vertical data to be stored in
WaveformD. When the bit is high, the write strobe for Waveform D is disabled.
UPDATEC_L. This bit, when low,allows the vertical data to be stored in
WaveformC. When the bit is high, the write strobe for Waveform C is disabled.
UPDATEB_L. This bit, when low,allows the vertical data to be stored in
WaveformB. When the bit is high, the write strobe for Waveform B is disabled.
UPDATEA_L.This bit, when low, allows the vertical data to be stored in
WaveformA. When the bit is high, the write strobe for Waveform A is disabled.
Display Control Register. The Display Control Regi ster is located at I/O memory
location 0x0FA02. The Display Control Register is a read/writeregister.
Table3 -9: Display Control Register
Bit
Number Mnemonic
Activity
Level Description
7TEXT4 High Display TextPage 4 on the CRT
6TEXT3 High Display TextPage 3 on the CRT
5TEXT2 High Display TextPage 2 on the CRT
4TEXT1 High Display TextPage 1 (readouts) on the CRT
3DISPD High Display Waveform D on the CRT
2DISPC High Display Waveform C on the CRT
1DISPB High Display Waveform B on the CRT
0DISPA High Display Waveform A on t he CRT
TEXT4. This bit, w hen high, places page four of the four poss ible readout pages
on the CRT.Any number of text pages may be displayed on the CRT however,
the resulting display may not be readable,and will flicker severely.