Specifications

ManualsBrandsMegatel ManualsComputer equipmentQuark/100

, .

MOVETABLE:

OCH

't;

:

~

l

;SAM

INTERFACE

DB

DW

DB

DW

DB

DW

DB

DW

.

OBH,OBH

(EBOOTEND-EBOOT)

,I

I

AND

OFFH

;

READ

IN

EPROM

I

BOOT,EBOOT

30H

CHARLD,XCHARLD

;CHARACTER LOADER,

MAXIMUM

'48

BYTES:

;DESTINATION TS

SECOND

HOLE

IN

VDM

'

(XENDFL-EBOOTFL)

BOOTFL,EBOOTFL

OFFOOH,EBOOTFL

038h,ebootf1

OFFH

AND

OEFH

;BOOT

FAIL

;

DW

dw

DB

, . ENDSPACE

$,

24H

CEND4

EQU

$

·ENDSPACE CEND4'

ORG

500H

I

;END

OF

TABLE

,

;THIS

SECTION EXECUTES

IN

THE

VIDEO

MEMORY

TO

LOAD

;

XCHARLD:

CHARLO

;

EQU

;

THE

0

AND

80H

CHARACTER

POSITIONS

;

CODE

RUNS

AT

BOTSCREEN+80H

TO

BOTSCREEN+80H+48

I , ,

I'

BOTf?CREEN+80H

;RETURN

TO

BOOTSTRT

IS

ALREADY

ON

THE

STACK

LXI

CALL

B,BOTSCREEN

VSLOOP

,

;THIS

ADDRESS

MUST

CONTAIN

OOH

TO

,START

LXI

H,BOTSCREEN+20H

4C)CON~MOV~VI

A,16

CONTMOV

EQU

$-XCHARLD+CHARLD

MVI

M,080H

~"""-"7"""'"H~

DCR:

A

JRNZ

XCONTMOV

,CMA

,

;

STAX

'B

, I

; " '

XVSLOOP:

VSLOOP

EQU

$-XCHA1}LD+CHARLD

;

.************************************************** , ,

;

CODE

STARTING

FROM

HERE

~UST

,BE

\PRECISELY TIMED

·

,

,

I.

;CLEAR

ANY

PENDING IRQA INTERRqPTS

IN

PIAPORT

·

,

;WAIT FOR VERTICAL

SYNC

INTERRUPT

CYCLE

·

,

XWAITINTERRUPT:

WAIT

INTERRUPT

IN

ANA

JP

EQU

,$-XCHARLD+CHARLD

PIAPORT+1

A

;LOOK

FOR lRAQA INTERRUPT

WAITINTERRUPT

;12

T STATES

MVI

E,8

;WE

SHOULD

BE

AT

THE

HORIZONTAL

RETRACE

AT

THE

START

OF

THE

;FIRST

LINE

OF

VDM.

(OF020H)

;

XHSLOOP:

HSLOOP

EQU

$-XCHARLD+CHARLD