Caple C871i Bedienungsanleitung PDF herunterladen (Seite 464)

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Apple II Computer Info

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Path:

news.weeg.uiowa.edu!news.uiowa.edu!uunet!decwrl!waikato.ac.nz!comp.vuw.ac.nz!actri

x!David.Empson

Newsgroups: comp.sys.apple2

Subject: Re: Apple SSC and CTS/RTS choking on the 6551

Message-ID: <[email protected]>

From: [email protected]

Date: Sun, 22 Nov 1992 12:09:42 GMT

Sender: [email protected] (David Empson)

References: <uerics.721932539@mcl> <[email protected]>

<[email protected]>

Organization: Actrix Information Exchange

Lines: 25

In article <[email protected]> [email protected]

(John Palaima) writes:

> Does anyone know a hardware cure for fixing the screwy 6551 on the

> SSC card other than replacing it with the CMOS..it fixes the problem

> but the timing ould be too far off

Please elaborate. What do you mean by "the timing would be too far

off"? The 6551 and 65C51 have nearly identical bus interface

timings characteristics.

I gather your problem with the 6551 is that CTS kills the trasmitter,

RTS kills the transmitter, DTR kills the receiver AND the transmitter,

and DCD kills the receiver.

On the 65C51, CTS still kills the transmitter, but it lets a partial

byte through. Similarly, DCD kills the receiver but lets a partial

byte through.

The other signals behave as before - turning off RTS will disable the

transmitter, turning off DTR will disable all transmit and receive (and

interrupts).

David Empson

Internet: [email protected] [email protected]

Snail mail: P.O. Box 27-103, Wellington, New Zealand

Path: news.weeg.uiowa.edu!news.uiowa.edu!uunet!cs.utexas.edu!ut-

emx!ccwf.cc.utexas.edu

From: [email protected] (Michael Foegelle)

Newsgroups: comp.sys.apple2

Subject: Re: Fast modems and the SSC

Message-ID: <[email protected]>

Date: 22 Nov 92 22:21:19 GMT

References: <[email protected]>

<[email protected]> <[email protected]>

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 464 of 572

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