Tektronix 494AP service manual O a o A e

-	494A/494Ap
Maintenance
	ServiceVot.i
	Table 6-13(cont)
DataBits
7 6 5 4 3 2 1 0	Description

C.Vldeo Processor(7C)

	TableS13 (cont)
Data Bits
7 6 5 4 3 2 1	Description

D.DigitalStorage (cont)

o o o a

a

t

t

a

0 1 1 x x x x x

0 0 1 x x x x x

1 l 1 x x x x x

0 1 0 x x x x x

x x x 0 0 0 0 x x x x 0 0 0 1 x x x x 1 0 0 1 x x x x 1 1 0 1 x x x x 0 0 1 1 x x x x 1 0 1 1 x x x x 1 1 1 1 x x x x x x x x l x x x x x x x 0

D. DlgitalStorage

lx x x x x x x 0 x x x x x x x

Out-of-bandclamp- ns clamp Out-of-bandclamp- g;6rt upper5 div Out-of-bandctamp- 66rO lowerdiv Out-of-bandclamp- qlgmt lower5 div

Mdeo filter off Videofilter30 kHz Mdeofilter3 kHz Videofilter300 Hz Videofilter30 Hz Mdeofilter3 Hz Mdeofilter0.3 Hz Base-linelevelingon Base-linelevelingoff

Horlzontal Digital Storage Board

7B

Digital Storage Acquisition Enable

Digital Storage Acquisition Dis- abl€

	Horlzontal Digital Storage
	Board (cont)
	7A.1
DB8,DBg	SecondaryMarkerpositionbits
DB1	SecondaryMarkertracebit
	7A.2
DBl-7	PrimaryMarkerpositionbits
DBO	PrimaryMarkertracebit
	7A.3
DB8_9	PrimaryMarkerpositionbits
DB1	PrimaryMarkertracebit
	7A,.4
ADDRT-ADDRO	DigitalStorageaddressbits
	7A.5
DB6	Transfersthe bus to the Vertical
	DigitalStorageboard.
DB5	Determinesif bus transferis for
	a single cycle or until it is
	returned by the Vertical Digital
	Storageboard.

o

Io

Io

a

o o o o

Io

o o o o

x l x x x x x x x x l x x x x x x x x l x x x x x x x x l x x x x x x x 0 x x x x x x x x l x x x x x x x 0 x x x x x x x x l x x x x x x x 0 x x x x x x x x l x x x x x x x 0

ExtendedAddress 2-O

Extended Address 2

Extended Address 1

Extended Address 0

B-SAVE A on

B-SAVE A otr

VIEWB on

VIEWB off

VIEWA on

VIEWA off

SAVEA on

SAVEA off

Subaddressbits for Port7A giv-

ing subaddresses Z-0. Addressing 7A.6 transfers the

bus to the Vertical Digital Storageboard.

D84

ADDRg,ADDRS

DB4-7

DBO-3

DBO-7

DisableUpdateMarker

Loading ADDRT-o reloads th€ lastADDR9.8

7A.7

PrimaryMarkerintensitybits SecondaryMarkerint€nsitybits

FA

DigitalStoragepositionbits

FB

Always low to indicatethat it is from the Horizontal Digital Storageboard

o o o a o

I

o o a e

DB1-DB7

DBO

7A.0

SecondaryMarkerpositionbits SecondaryMarkertracebit

DBO& DBl DigitalStoragepositionbits

t

Io

o o o o

6-58

e

o a