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From: daveh@cbmvax.UUCP (Dave Haynie)
Newsgroups: comp.sys.amiga
Subject: Re: A2000 serial port != A1000 (ackkkk!)(and 500 || <> 1000 ||)
Message-ID: <2590@cbmvax.UUCP>
Date: Fri, 23-Oct-87 14:49:45 EST
Article-I.D.: cbmvax.2590
Posted: Fri Oct 23 14:49:45 1987
Date-Received: Sun, 25-Oct-87 18:03:16 EST
References: <1312@atkins.munsell.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 108

in article <1312@atkins.munsell.UUCP>, klm@munsell.UUCP (Kevin (with the fiberglass reinforced left foot) McBride) says:
> Summary: How can we win when you keep changing the rules?


> This article contains a *little* bit of Spam. :-)

Dirty Vikings!

> Are you (Commodore) going to publish some kind of document describing
> (in detail) what you gotta do to fabricate a cable to correct for this
> incompatibility?  Are you going to make it available to everybody and
> not just "Developers"?  And not charge as much for it as it costs to
> buy a set of RKMs, which I haven't done yet because I think they're too
> @#$%^& expensive?  Well, actually, I have a set of *old* RKMs, but I'll
> be dipped in @#$% if I'm going to lay out even more $$$$ to buy a new
> set.

At least you CAN buy a set of RKMs, whatever the price.  I'm not sure if,
even at this late date, you can get that kind of comprehensive information
on other machines, like Macs or Ataris.

Well, don't know what (Commodore) is planning, but me (Dave) has all you
will ever need to know to make adaptor cables listed below.  

> Sorry if this sounds like a flame, but it's early and I haven't had my
> coffee yet and my broken ankle is killing me and I'm bummed out because
> I did away with my ski season this year.  

Early for you.  I'm still working on Thursday night....

> Kevin McBride, the guy in the cast   //       | Your mind is totally controlled
> Raquetball - the only way to        //        | It has been stuffed into my mold
> ruin your ski season :-(       \\  //  Amiga  | And you will do as you are told
> {encore,adelie}!munsell!klm     \\//   Rules! | until the rights to you are sold

How's about something like this:


PARALLEL

	A1000 provides a male D-25 connector (DB25P), A500 and A2000 provide
female D-25 connectors (DB25S).

Signal		    A500 Pin	    A1000 Pin	    A2000 Pin

/STROBE			1		1		1
D0			2		2		2
D1			3		3		3
D2			4		4		4
D3			5		5		5
D4			6		6		6
D5			7		7		7
D6			8		8		8
D7			9		9		9
/ACK			10		10		10
BUSY			11		11		11
POUT			12		12		12
SEL			13		13		13
+5V [1]			14		23		14
/RESET			16		25		16
GND			17-25		14-22		17-25

[1] +5V on the A500/A2000 is resistively current limited to about 10mA to
    protect the system against some standard printer cables, which may ground 
    this line.


SERIAL

	A1000 provides a female D-25 connector (DB25S), A500 and A2000
provide a male D-25 connector (DB25P).

Signal		    A500 Pin	    A1000 Pin	    A2000 Pin [2]

Shield GND		1		1		1
TxD			2		2		2
RxD			3		3		3
RTS			4		4		4
CTS			5		5		5
DSR			6		6		6
Signal GND		7		7		7
CD			8		8		8
+12V [1]		9		23		9
-12V [1]		10		N/A		10
Audio OUT		11		15		11
Audio IN		18		16		18
DTR			20		20		20
RI			22		N/A		22
-5V [1]			N/A		14		N/A
Buffered E		N/A		17		N/A
/INT2			N/A		18		N/A
+5V [2]			N/A		21		N/A
/C2			N/A		24		N/A
/RESET			N/A		25		N/A

[1] +/- 12V on the A500 is resistively currently limited to about 10mA for
    protection.  +/- 12V on the A2000 is diode protected and current limited
    to about 200mA.  +/- 5V and +12V are not physically limited in any way on
    the A1000; care must be used in hooking up external cables, as the wrong
    connection could damage the A1000 internal circuitry.

[2] A1000 signals not present on the A2000 serial connector are available on
    a 26 pin header internally.

-- 
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