Caple C871i Manual do Utilizador descarregar pdf (Página 68)

100

101

Apple II Computer Info

or ProDOS doesn't have a driver for the clock.

The drawback of this method, of course, is that you only get one-minute

resolution. If you want to time events more accurately than that, you'll

have to use more complicated methods.

The GS clock can provide one-second resolution. The easiest (and only

Officially Suppored) way to get it is to call the Miscellaneous Toolset.

Again, you need to CALL a machine-language routine:

clc ; switch to native mode

xce

rep #$30

pha ; push space for result

pha

ldx #$0D03 ; ReadTimeHex

jsl $E10000

sec ; back to emulation mode

xce

ldx #7 ; pop results and save

l1 pla

sta $200,X

dex

bpl l1

rts

This routine leave the clock values in the following memory locations:

PEEK(512) -- weekday (1..7, 1=Sunday)

PEEK(513) -- (not used)

PEEK(514) -- month (0..11)

PEEK(515) -- day (0..30)

PEEK(516) -- year minus 1900

PEEK(517) -- hour (0..23)

PEEK(518) -- minute (0..59)

PEEK(519) -- second (0..59)

(Sorry...no BASIC example this time. I'm not feeling quite ambitious

enough to hand-assemble that machine language and convert it to DATA

statements.)

- Neil Parker

Neil Parker, nparker@{cie-2,cie}.uoregon.edu, http://cie-2.uoregon.edu/~nparker

"Evolution is vastly overrated." -- Ambassador Delenn, _Babylon_5_

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Apple II Computer Technical Information : Apple II Family Hardware Info

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Caple C871i Manual do Utilizador Página 68

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