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- Path: sparky!uunet!sybus.sybus.com!myrddin!tct!psycho!f20.n3603.z1.FIDONET.ORG!brianh
- From: brianh@f20.n3603.z1.FIDONET.ORG (Brian Heyboer)
- Sender: ufgate@psycho.fidonet.org (newsout1.24)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Internal serial port in
- Message-ID: <23055.2A8D43F4@psycho.fidonet.org>
- Date: Fri, 14 Aug 92 10:47:10 EDT
- Organization: FidoNet node 1:3603/20 - Mercury Opus NEC360, St Petersburg FL
- Lines: 32
-
- In an article of 12 Aug, wirth@igd.fhg.de (Hanno Wirth) writes:
-
- HW> last time I screwed my A2000 rev. 4.1 apart, I noticed a connector (CN 304)
- HW> which sits right next to the external serial port. There was a posting in
- HW> c.s.a.h not long ago which stated that this is "the internal serial port" o
- HW> the A2000. I mailed the guy who wrote the article, but he was of no help.
-
- HW> My questions: - is this port usable in terms of hardware (pins connected
- HW> to serial chip)?
- HW> - if it is indeed usable, what's it's pinout?
- HW> - is it supported by serial.device?
-
- Yes, that's the internal serial port. But it is mostly wired in
- parallel with the external port and is not a separately-addressable
- port. I say MOSTLY because it is actually wired like an A1000 serial
- port (including voltages) when connected via ribbon cable to a DB-25.
- Only real use I've ever seen is for those with A1000-specific MIDI
- interfaces.
-
- If you look at a schematic, it doesn't look like it's wired like an
- A1000 port, but that's because the header connector is numbered
- differently than a DB connector. Using straight ribbon cable and IDC
- connectors does give the proper connections (you leave pin 26 of the
- header unconnected since the DB-25 has but 25 pins).
- ___
- X SLMR 2.1 X
-
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