Path: utzoo!mnetor!uunet!husc6!bloom-beacon!mit-eddie!ll-xn!ames!pasteur!ucbvax!VTVM1.BITNET!EVANSL
From: EVANSL@VTVM1.BITNET (Lyle Evans)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: Re: Serial card of PC/PS2
Message-ID: <8804081511.aa07038@Louie.UDEL.EDU>
Date: 8 Apr 88 19:08:15 GMT
References: <CNV38%BNR.BITNET@cornellc.ccs.cornell.edu>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 3

Sounds like the IBM RTIC (Realtime Interface Co-processor) comes close to
meeting your requirements. There is available  separately a C language Support
package.