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From: Sullivan@cup.portal.com (sullivan - segall)
Newsgroups: comp.sys.amiga.tech,comp.sys.amiga.hardware
Subject: Help with serial printer
Message-ID: <31724@cup.portal.com>
Date: 14 Jul 90 23:09:07 GMT
Distribution: na
Organization: The Portal System (TM)
Lines: 45

My printer and my Amiga aren't talking to eachother.  I've gotten
them as far as printing out data from the OS prompt, but more than
a couple of lines of text overflows the printer data buffer, and 
gives me garbage.

So I checked my printer manual, and found that the printer asserts
DTR (pin 20) when it is ready to accept data, and drops DTR when
the buffer is full.  I faithfully connected DTR to CTS (pin 5 on the
Amiga side) and enabled RTS/CTS handshaking from preferences.  
Unfortunately in this state no data is ever sent to the printer.  
So I thought I'd check the serial status bits on the serial port
to see whether the signal was coming across correctly.  

I pulled out my hardware reference manual and proceeded to read about
the serial registers in the Amiga, only to find that CTS status 
doesn't appear in any of them.  

My questions then are these:

1.	How can you perform CTS/RTS handshaking when you can't 
	determine the state of the CTS line?  (Especially when
	there isn't any hardware support for handshaking protocols.)

2.	Should CTS be asserted HIGH or LOW to allow data to be 
	transmitted.

3.	Any suggestions which might allow me to use my printer.


Additional data:
	A2000, Wb1.3 (not 1.3.2), Serial TTY preferences printer,
	1200 O 1 RTS/CTS, "dir >prt:"

Thanks for any help. -kls

                           -Sullivan Segall
_________________________________________________________________
 
/V\  Sullivan  was the first to learn how to jump  without moving.
 '   Is it not proper that the student should surpass the teacher?
To Quote the immortal Socrates: "I drank what?" -Sullivan
_________________________________________________________________
 
Mail to: ...sun!portal!cup.portal.com!Sullivan or
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