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- Path: sparky!uunet!uunet.ca!xenitec!zswamp!geoff
- From: geoff@zswamp.UUCP (Geoffrey Welsh)
- Newsgroups: comp.dcom.modems
- Subject: Re: Diffs between 16550A & 16550AFN
- Message-ID: <e1cRXB3w165w@zswamp.UUCP>
- Date: Thu, 21 Jan 93 22:03:25 EST
- References: <3696@aegis.or.jp>
- Organization: Izot's Swamp
- Lines: 24
-
- davidg@aegis.or.jp (Dave McLane) writes:
-
- > My National Semiconductor "Data Communications Local Area UARTS Handbook"
- > (1990 edition) says:
- >
- > The NS16550AF is an improved version of the NS16450 Universal
- > Asynchonous Receiver/Transmitter (UART). Functionally identical
- > to the NS16450 on powerup (CHARACTER mode)[*1*], the NS16550AF can be
- > put into an alternate mode (FIFO mode) to reclieve the CPU of
- > excessive software overhead.
- >
- > [*1*] Can also be reset to NS16450 Mode under software control.
-
- That's exactly what they said about the NS16550A. I do not know of any
- differnece between the A and AF part, and I'm beginning to believe that
- National slipped the "F" in there to mean "FIFO" without making any changes to
- the chip.
-
- Geoffrey Welsh, 7 Strath Humber Court, Islington, Ontario, M9A 4C8 Canada
- geoff@zswamp.uucp, [xenitec.on.ca|m2xenix.psg.com]!zswamp!geoff (416)258-8467
- Now I've lost everything, I give to you my soul
- And the meaning of all that I believed before escapes me
- In this world of none, no thing, and no one
- - Genesis, _Afterglow_
-