wooters@icsib13.berkeley.edu (Chuck Wooters) (03/12/90)
Hello- I have a generic (made in Taiwan) multi I/O card. It has a printer port/clock calend/game/ and (I thought) two serial ports. I bought the card a couple of years ago, and until recently had no need for the second serial port. When I tried to hook my mouse to COM2, I discovered that the card was missing a chip in the socket marked COM2 :-(. Does anyone know what this chip is? (I think it might be a UART) What is the number of the chip? Where can I order it? Thanks. Chuck Wooters wooters@icsi.berkeley.edu
cs4g6ag@maccs.dcss.mcmaster.ca (Stephen M. Dunn) (03/13/90)
In article <22946@pasteur.Berkeley.EDU> wooters@icsi.berkeley.edu (Chuck Wooters) writes:
$I have a generic (made in Taiwan) multi I/O card. It
$has a printer port/clock calend/game/ and (I thought)
$two serial ports. I bought the card a couple of years
$ago, and until recently had no need for the second
$serial port. When I tried to hook my mouse to COM2,
$I discovered that the card was missing a chip in the
$socket marked COM2 :-(.
All of the I/O cards I've seen (granted, not many) require three
chips to upgrade to a second serial port. For my board, these are
a 16450 (UART), MC1488P or SN75188 (converts TTL levels to RS-232),
and MC1489P or SN75189 (converts RS-232 levels to TTL). All three
chips should be available at any half-decent electronics retailer
(for that matter, even Radio Shack used to sell the latter two).
--
Stephen M. Dunn cs4g6ag@maccs.dcss.mcmaster.ca
<std_disclaimer.h> = "\nI'm only an undergraduate!!!\n";
****************************************************************************
"So sorry, I never meant to break your heart ... but you broke mine."mep@stb.uucp (Marty) (03/15/90)
In article <22946@pasteur.Berkeley.EDU> wooters@icsi.berkeley.edu (Chuck Wooters) writes: >Hello- > >I have a generic (made in Taiwan) multi I/O card. It >has a printer port/clock calend/game/ and (I thought) >two serial ports. I bought the card a couple of years >ago, and until recently had no need for the second >serial port. When I tried to hook my mouse to COM2, >I discovered that the card was missing a chip in the >socket marked COM2 :-(. > >Does anyone know what this chip is? (I think it might >be a UART) What is the number of the chip? Where can >I order it? > You're right, it's a uart. Specifically, it's a 8250 made by National Semi and others. It can be ordered mail order... just check out Byte or something similar for addresses. marty
dold@mitisft.Convergent.COM (Clarence Dold) (03/18/90)
In article <22946@pasteur.Berkeley.EDU> wooters@icsi.berkeley.edu (Chuck Wooters) writes: >I have a generic (made in Taiwan) multi I/O card. It >has a printer port/clock calend/game/ and (I thought) >two serial ports. I bought the card a couple of years Check with the store (?) where you got the card. Fry's Electronics in Fremont sells the DTK 2-port / 1 populated card, and a fairly cheap, looks generic, add-on for the second port, includes the chip, the extra RS232 connector and a little cable. -- --- Clarence A Dold - dold@tsmiti.Convergent.COM (408) 435-5293 ...pyramid!ctnews!tsmiti!dold FAX (408) 435-3105 P.O.Box 6685, San Jose, CA 95150-6685 MS#10-007
craigs@cognos.UUCP (Craig Statchuk) (03/21/90)
In article <22946@pasteur.Berkeley.EDU> wooters@icsi.berkeley.edu (Chuck Wooters) writes: >I discovered that the card was missing a chip in the >socket marked COM2 :-(. Most of the cards I have run into use the Intel 8250 (or equivalent) although Motorola chips show up occasionally -- how to tell? Get the data sheets and the data / ground connections -- the chip required should be obvious. You should also look for spare 14 pin DIP sockets "near" the missing COM2 socket. These sockets are typically used for the RS232 line drivers (MC1488 and MC1489). Many manufacturers seem to leave these chips out when providing "optional" COM ports. All of these chips are very common and very inexpensive (about four dollars in total from any good discount part distributor) -- Avoid your friendly computer dealer -- I have seem these upgrade packages advertised for as much as $20. -- Craig Statchuk P.O. Box 9707 uunet!mitel!sce!cognos!craigs Cognos Incorporated 3755 Riverside Dr. HUMAN: (613) 738-1440 Ottawa, Ontario FAX: (613) 738-0002 CANADA K1G 3Z4