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Article #2197Re: 2400 baud modems
From: Jeff Porter
Date: Sun, 10 Aug 1986 02:21
Date: Sun, 10 Aug 1986 02:21
19 lines
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1386 bytes
> In article <2050@watmath.UUCP> grwalter@watmath.UUCP (Fred Walter) writes: > > Actually, what is needed is a hardware UART. I have diddled with > perhaps taking an Intel chip and hanging it off the user port, using > the timer as the bit clock, but haven't attempted it yet. A 6800/6500 > family chip would be very difficult to hang off the user port, since > it would be a synchronous chip (needing a 1 Mhz. clock to operate and > expecting its operands within that clock). > What you need to do is hang the UART off the CARTRIDGE PORT not the USER PORT. A 6551 will do nicely. You will however need to write your own software to look at this different location for the UART. This UART is software selectable to 19.2K baud, but I will wager that you run into crunching power before this (esp. with a smart terminal emulator). Jeff Porter Commodore Engineering
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!caip!cbmvax!porter From: porter@cbmvax.cbm.UUCP (Jeff Porter) Newsgroups: net.micro.cbm Subject: Re: 2400 baud modems Message-ID: <604@cbmvax.cbmvax.cbm.UUCP> Date: Sat, 9-Aug-86 22:21:10 EDT Article-I.D.: cbmvax.604 Posted: Sat Aug 9 22:21:10 1986 Date-Received: Tue, 12-Aug-86 10:05:59 EDT References: <2050@watmath.UUCP> <865@usl.UUCP> Organization: Commodore Technology, West Chester, PA Lines: 19