Path: utzoo!utgpu!watserv1!maytag!xenitec!zswamp!root
From: root@zswamp.uucp (Geoffrey Welsh)
Newsgroups: comp.dcom.modems
Subject: FAS 208 ISC Unix 2.2.1 Hauppauge 33MHz 4860 motherboard
Message-ID: <230.285ED749@zswamp.uucp>
Date: Tue, 18 Jun 91 10:47:00 EDT
Organization: Izot's Swamp BBS (FidoNet), Kitchener, Ontario

Dean Carpenter (deano@admiral.UUCP ) wrote:

 >Recently I posted about having problems with the 4860 
 >motherboard frm 
 >Hauppauge not being able to handle incoming async at 19200 
 >under ISC unix 
 >2.2.1.  Although FAS reports that it initted two 16450s, the 
 >actual UART 
 >is a PLCC chip from UMC labelled :

 >        UM82C452L
 >        9031S
 >        529660

 >I've been told that this contains two 16450s, and possibly 
 >also handles 
 >the parallel port.  As this isn't just a simple 
 >yank-the-450s and
 >stick-in-the-16550As case, what can I do ?  Does anyone know 
 >exactly what 
 >this chip is, and more to the point, is there a replacement 
 >for it that 
 >will contain the 16550A FIFOs ?  Any help would be most 
 >appreciated :)

   UMC (Universal Microelectronics) is a Korean (I believe) company which 
specializes in low-cost ICs, including custom ICs designed to hold the 
equivalent of an entire I/O card.  Other companies do the same.

   Unfortunately, this pretty much prevents one from using a 16550.

   You might want to see if there's some way to disable the serial ports on 
the all-in-one chip or, if it's on a card, replace the card. 

--  
Geoffrey Welsh - Operator, Izot's Swamp BBS (FidoNet 1:221/171)
root@zswamp.uucp or ..uunet!watmath!xenitec!zswamp!root
602-66 Mooregate Crescent, Kitchener, ON, N2M 5E6 Canada (519)741-9553
"He who claims to know everything can't possibly know much" -me