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Path: utzoo!linus!decvax!bellcore!ulysses!burl!clyde!watmath!watnot!watdragon!cjsgro
From: cjsgro@watdragon.UUCP (Carlo Sgro)
Newsgroups: net.micro.apple
Subject: Summary of Z80 card slot question
Message-ID: <428@watdragon.UUCP>
Date: Sun, 23-Feb-86 23:24:47 EST
Article-I.D.: watdrago.428
Posted: Sun Feb 23 23:24:47 1986
Date-Received: Wed, 26-Feb-86 05:54:11 EST
Reply-To: cjsgro@watdragon.UUCP (Carlo Sgro)
Organization: U of Waterloo, Ontario
Lines: 47



This is a collection of all the response that I received on my question about
where the Z80 card should go.  As will become evident on reading it, it seems
like there is some conflict over which slot CP/M looks for it in.

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Most slot assignments on an apple ( esp. II+ ) are just convention
with a few established for good reason. Specifically, the apple
starts searching the buss at powerup by working down from slot 7 through
0. Slot 7 differs from the others only in that there is a vertical
sync signal available ( this is why 'fancy' graphics and color 
boards like the Electrohome Supercolor board are placed here ). This
is also the reason that the drive controller board is placed in 6.
( ie. this will be the first normal device recognized ). By convention
a z-80 card is placed in slot 5 and most cp-m software will
look for it here ( ie addr c500 ). We have always placed our 6522 board
in slot 4 ( a real time clock and parellel interface , since this is most
often an open slot), 80-column card in 3 ( sync is tagged in externally),
printer in 1 and language card in 0 ( the only reason this is here that I'm
aware of is because it allows for easy access to the top of ram ).
For the life of me I cannot remember what goes in slot 2.

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   I personally use slot #4 for my Z-80 card (a Franklin Z-80 card), and most of my friends who have other Z-80 cards also seem to use slot #4.  It does not however matter what slot it is put into.  I would suggest not using slot 7, as that is usually reserved for a second set of floppies or a hard disk.

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You can plug the card into *any* slot, except slot 0.
There is no hardware restriction, in general, relating
to which slot a card can be plugged into (except for
slot 0, of course).  However, CP/M will not work with
the Z-80 card plugged into a slot other than 4.  This
is because the CP/M boot program expects to find the
card in slot 4.  The only fix here is to modify that
boot program and the CP/M operating system.


-- 

Carlo Sgro
...![ihnp4||decvax||allegra||clyde||utzoo]!watmath!watdragon!cjsgro

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