home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.cbm
- Path: cds9172.Cadence.COM!daled
- From: daled@cds9172.Cadence.COM (Dale DePriest)
- Subject: Re: Do PETs have serial ports?
- Message-ID: <DKo2Kv.1oM@Cadence.COM>
- Sender: news@Cadence.COM
- Organization: Cadence Design System, Inc.
- References: <Pine.SUN.3.91.951230191616.25287A-100000@vger.cpnet.net> <4caq3p$90q@tuegate.tue.nl> <Pine.SUN.3.91.960103214407.26612F-100000@vger.cpnet.net>
- Date: Thu, 4 Jan 1996 17:14:54 GMT
-
- In article <Pine.SUN.3.91.960103214407.26612F-100000@vger.cpnet.net>, Dave Tickle <aiu214@freenet.mb.ca> writes:
- |>
- |>
- |> On 2 Jan 1996, Martijn van Buul wrote:
- |>
- |> > Dave Tickle (aiu214@freenet.mb.ca) wrote:
- |> > : I have an old Commodore pamphlet that claims that the CBM 8000 series
- |> > : and/or SP9000 machines have RS-232 serial ports. I also saw a document
- |> > : somewhere on the WWW that suggested the same thing.
- |> >
- |> > : Can anyone verify that this is true? And, if true, where is the port
- |> > : located and does it use the standard RS-232 voltages? (+/-12v)
- |>
- |> > Well, it HAS a serial (RS-232C) port, like evry commodore micro with an
- |> > user-port has. Only problem is -> The logic levels are TTL (0/+5v) instead
- |> > of +/- 12 V. There are several chips (MAX232?) who could solve this problem
- |> > though.
- |>
- |> As a C=64 owner, I know what you are talking about, here. And, I suppose
- |> it would be possible to plug a C=64 modem into the parallel port and
- |> write my own software to drive it.
- |>
- |> But, what I'm really wondering is whether or not the 80-column PETs have
- |> BUILT-IN support for a serial port the way the VIC and 64 do. (i.e.,
- |> being able to open a file for serial I/O and having I/O routines built in
- |> to the ROM). I know that you can't open device #2 as serial like you can
- |> on the VIC/64 because on the PET, device #2 is the second cassette drive.
- |>
- |> Any thoughts out there on this? Do the 8000/9000 series PETs have a
- |> true, dedicated serial port or was it just a bunch of advertising propaganda?
- |>
- |> Martijn, thanks for the reply.
- |>
- Pets do not have a serial port or software support for serial devices for the
- user port. Perhaps the software support could be lifted from a C=64.
- I believe I heard about a third party support that hung off of the user port
- but I don't remember for sure. Commodore supported a modem off the ieee488
- port on this box.
- --
- _ _ Dale DePriest San Jose, California
- /`) _ // daled@Cadence.COM voice: (408) 428-5249
- o/_/ (_(_X_(` fax: (408) 894-3457
-