DEC VT220 - 9007 VPAC: Characters Per Horizontal Period Register

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OPCR

ADDRESS

B7FDH

{Wi'll

07

06

05

04

03

02

01

00

OP7

I

OPS

OP5

I

OP4

I

OP2

OP1

R

(BAD]

HI"

~ (BADO

HI

BIT VALUES

COMPLIMENT OP7

FOR

DIS VIDEO H TRUE

COMPLIMENT OP7

FOR

DIS VIDEO H FALSE

COMPLIMENT OP6

FOR

BNKS1 H TRUE

COMPLIMENT OP6

FOR

6NKSl

H FALSE

COMPLIMENT OP5

FOR

BNKSO H TRUE

COMPLIMENT

OPS

FOR

BNKSO H FALSE

COMPLIMENT OP4

FOR

1

J2

COL H TRUE

COMPLIMENT OP4

FOR

132

COL H FALSE

COMPLIMENT OP3

FOR

BLINK H TRUE

COMPLIMENT OP3

FOR

BLINK H FALSE

COMPliMENT

OP2

FOR

SPO

SEl

H TRUE

COMPLIMENT OP2

FOR

SPO SEL H FALSE

COMPLIMENT

OP1

FOR

OrR

H TRUE

COMPLIMENT

OP1

FOR

OTR

H FALSE

COMPLIMENT

OPO

FOR

RTS H TRUE

COMPLIMENT

OPO

FOR

RTS

H FALSE

2681

DUART:

Output

Port

Configuration

Register

(OPCR)

ADDRESS

07

06

17COH

(WR)

os

04 03

02

01

00

(BAD]

HjOl

..

t__------------------4-

..

iBADO

Hi

BIT VALUES

BIT

0-7

xx

BINARY DEFINITION

OF

NUMBER

OF

CHARACTER

TIMES

PER

HORIZONTAL PERIOD (TRACE

AND

RETRACE!.

NOTE

VALUE STORED IN CHARACTERS

PER

DATA

ROW REGISTER SUBTRACTED FAOM ABOVE

VALUE DEFINES CHARACTER TIMES IN

RETRACE PERiOD

............

Figure

C-14

91307

VPAC:

Horizontal

C-10

Characters

Per

Per

iod

Reg i

ster

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