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From: ericmcg@pro-generic.cts.com (Eric Mcgillicuddy)
Newsgroups: comp.sys.apple
Subject: Re: Printing from Assembly
Message-ID: <8684.infoapple.net@pro-generic>
Date: 15 Dec 89 07:49:10 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 14

In-Reply-To: message from cwilson@NISC.SRI.COM

IF you have maintained Basic.System, then let it do your work. Use DOSCMD to
initialize the printer. Store the string "PR#1"<cr> at $200 and JSR DOSCMD
($BE03). This sets up the output hooks for the printer. You can now use COUT
($FDED) to print your text just as if you writing to the screen.

If you are being difficult and designing a SYS program then it's more
difficult.You would need to initialize the card ($Cn0D) and then probably use
the PWRITE routine ($Cn0f holds the low byte of the address) to output it. 
Actually, ... disregard that.  Flipping to section 3.1, it says that by moving
$Cn00 to $36,$37 changes the standard output links. You should call the
subroutine at $3EA to transfer this link if you were using DOS. After this is
set COUT should be usable to get the text to the printer.