Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!agate!ig!uwmcsd1!marque!studsys!jetzer
From: jetzer@studsys.mu.edu (jetzer)
Newsgroups: comp.sys.apple
Subject: Re: Clock cards and Prodos
Message-ID: <186@studsys.mu.edu>
Date: 1 May 88 02:39:47 GMT
References: <18@lucifer.UUCP>
Organization: Marquette University - Milwaukee, Wisconsin
Lines: 25

In article <18@lucifer.UUCP>, rob@lucifer.UUCP ( 237) writes:
> Can anyone tell me how Prodos interfaces with a clock card?  I have (I think)
> the chips necessary to construct a card but would like to know what addresses
> Prodos looks at to get the time and date.  I suppose what I'm really after
> is a memory map of the Thunderclock card.  Can anyone help?  Thanks in advance.

Don't know anything about the hardware end of it, but the ProDOS clock
driver resides at $d742-$d7be; a jump to the ProDOS clock driver is on the
global page at $bf06-$bf08.

You can disassemble the code to find out how ProDOS actually makes the call.

After a call, ProDOS expects the clock to put the date in the input buffer,
in the following form:

07,04,14,22,46,57    (in ASCII format)

07 = month (01=jan .. 12=dec)
04 = day of week (00=sun .. 06=sat)
14 = date
22 = hour
46 = minute
57 = second
-- 
Mike Jetzer
"Hack first, ask questions later."