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From: daveh@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: A2000 serial port != A1000 (ackkkk!)(and 500 || <> 1000 ||)
Message-ID: <2646@cbmvax.UUCP>
Date: Wed, 28-Oct-87 17:30:18 EST
Article-I.D.: cbmvax.2646
Posted: Wed Oct 28 17:30:18 1987
Date-Received: Sat, 31-Oct-87 10:05:45 EST
References: <179@toylnd.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 54

in article <179@toylnd.UUCP>, dca@toylnd.UUCP (David C. Albrecht) says:

> At the very least you should have
> manufactured an add-on box which would have provided connectors which fit over
> the existing 2000 ones and provided proper 1000 ones on the other side. If
> necessary sockets on the back of the 2000 could have been provided for power
> pins which the widget box could use if the 2000 connectors don't already have
> them.  I'm not normally one for adding odd little useless hardware bits
> thereby driving up the cost of a box for everyone but I dare say that for some
> time the 2000's main audience is likely to be upgrading 1000 owners especially
> at the price it is at now.  

I don't expect that Commodore-Amiga will build a box like this, but it's very
possible to do it yourself, or for a 3rd party to do it.  And the resulting
box would be much nicer than what you propose, in that it would be built-in.

In the back of your A2000, next to the normal expansion slots, you'll find two
screw-in panels.  The one closest to the expansion slots also happens to be 
right above the serial port.  Hidden just inside this panel, right over the
serial port, is a 26 pin header that contains all the missing A1000 serial bus
signals.  If you wanted to build up a second connector, with the A1000 style
serial connector on one end, a ribbon cable and connector on the other, here's
how you'd connect them.

Signal		    A1000 DB25S Connector	A2000 CN304 Header

Frame Ground		1				1
TxD			2				3
RxD			3				5
RTS			4				7
CTS			5				9
DSR			6				11
Signal Ground		7				13
CD			8				15
-5V			14				2
Audio IN		15				6
Audio OUT		16				4
E Clock			17				8
/INT2			18				10
DTR			20				14
+5V			21				16
+12V			23				20
/C2 Clock		24				22
/Reset			25				24

That's all you need for do-it yourselfing, or commercial applications if that's
what you want to do.  Be sure you know the pintouts of each connector type 
before you go hooking anything up.

> David Albrecht
-- 
Dave Haynie     Commodore-Amiga    Usenet: {ihnp4|caip|rutgers}!cbmvax!daveh
   "The B2000 Guy"              PLINK : D-DAVE H             BIX   : hazy
    "Computers are what happen when you give up sleeping" - Iggy the Cat