Xref: utzoo rec.ham-radio.packet:2430 comp.protocols.tcp-ip.ibmpc:1697 comp.dcom.modems:4541 Path: utzoo!attcan!uunet!wuarchive!gem.mps.ohio-state.edu!apple!rutgers!bellcore!ka9q.bellcore.com!karn From: karn@ka9q.bellcore.com (Phil Karn) Newsgroups: rec.ham-radio.packet,comp.protocols.tcp-ip.ibmpc,comp.dcom.modems Subject: Re: KA9Q and serial rs232 lines Message-ID: <17702@bellcore.bellcore.com> Date: 24 Sep 89 02:23:11 GMT References: <17680@bellcore.bellcore.com> <302@van-bc.UUCP> Sender: news@bellcore.bellcore.com Reply-To: karn@ka9q.bellcore.com (Phil Karn) Organization: Secular Humanists for No-Code Lines: 12 In article <302@van-bc.UUCP> skl@wimsey.bc.ca (Samuel Lam) writes: >Do you mean I can physically replace the 8250 on my serial board with >a 16550? Wouldn't there be some trouble with the difference between >edge and level triggered interrupts? Yes, I've done this in my two PCs (one AT and one XT). They work just fine with amateur packet radio TNCs, but I haven't actually tried it yet in gateway mode with real SLIP. I set up the receive FIFO in the 16550 to interrupt at the 1/4 full point, so at 9600 bps the code has an extra 12 ms to respond to the interrupt. This is a big improvement. Phil