Re: Clock Card?

["Bill Garber" <willy4SPAM6pa@comXcast.net>]

"Linards Ticmanis" <ticmanis@coli.uni-sb.de> wrote in message
news:bl28em$426k4$1@hades.rz.uni-saarland.de...
> Bill Garber wrote:
>
> > Yes, I did. I tried ProDOS users.disk and it claims there is no
> > time or date. I tried reading the eprom, however I am not sure
> > if I should read C400 or CC00. They don't display the same
> > info. It is a 2764 which is I believe 8k so I'm not sure how that
> > would read since $100 is all that will fit in the slot memory.
> > How do I find out where the firmware is loading into RAM?
> > You would think just about any clock software would find it.
> > ThunderClock software searches the slots, finds none. NSC
> > looks for it and finds none of course since it isn't looking in a
> > slot at all. ProDOS seems to find nothing. I don't know what to
> > try next.
>
> With most cards which have a 2732, $100 bytes are mapped into the "slot
> x space" $Cx00-$CxFF directly, and the whole $800 are mapped from
> $C800-$CFFF as soon as you acesss the slot space. Advantages are: More
> room, and the ability to use absolute adresses in that adress space (as
> its start adress doesn't vary from slot to slot.) The latter mapping
> goes away again if $CFFF is accessed, as far as I remember.
>
> I'd assume that of the 2764 maybe only half is used and the other half
> isn't. Or it is mapped into the $C800 space in two separate banks
> somehow, but 4K sounds like overkill for a clock card.

Not to sound rude, and very sorry if this does, but if you'd read all
of my posts in this thread you would notice that I corrected the size
of the eprom to both having 2708 which are 1k in size.

Now with that out of the way, your post pretty much mirrors that
of Mr. Mahon's posts. I've sort of side stepped on those for now.
I have plenty of other things going on and I probably could design
and build a clock card faster than I can figure out these, but it is
rather fun to try, don't you agree? If you come up with anything
more let me know. I'll be going back to them soon.

Thanks,

Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy4SPAM6pa@comXcast.net
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