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- Path: sparky!uunet!pipex!unipalm!uknet!pyrltd!mwuk!tony
- From: tony@microware.co.uk (Tony Mountifield)
- Newsgroups: comp.sys.atari.st.tech
- Subject: Re: TT VME Interrupt help needed!
- Message-ID: <1317@mwuk.UUCP>
- Date: 11 Jan 93 09:24:49 GMT
- References: <1313@mwuk.UUCP> <73241@cup.portal.com>
- Organization: Microware Systems (UK) Ltd., Winchester, UK.
- Lines: 40
-
- In article <73241@cup.portal.com> Bob_BobR_Retelle@cup.portal.com writes:
- > Tony Mountifield asked about the VME implementation on the TT.
- >
- > You've just discovered the joys of dealing with non-standard
- > implementations of "standards".
- >
- > The "AVME" slot on the TT is only a partial implementation of
- > the VME standard, similar to the way the "ACSI" port was a
- > crippled SCSI implementation.
- >
- > The Atari implementation of the AVME port does *not* have any
- > provisions for bus-mastering, which it sounds like the Ethernet
- > card assumes is available.
- >
- > The only useful cards for the TT are passive devices like
- > graphics cards, which do not need to take control of the bus.
- >
- > This leaves out a very large percentage of the "hundreds and
- > hundreds of VME cards" we often hear about...
- >
- > As Alan Pratt said, "maybe next time"...
-
- Sorry, Bob, I think you misunderstood me. The card was *designed* to go
- into the TT VME slot, and has working TOS software to support it. The
- card is definitely a VME slave only, and does not require bus
- mastership. What I want, however, it to discover how it can generate an
- interrupt (not a Bus Request), and how to handle that interrupt in the
- TT. The TOS software does not appear to use interrupts, but the driver
- I am writing is to run under OS-9, not TOS. I do know the *IRQ5 line is
- connected in the card.
-
- Tony.
- --
- Tony Mountifield (G4CJO) | Microware Systems (UK) Ltd.
- -----------------------------------| Leylands Farm, Nobs Crook,
- Email: tony@microware.co.uk | Colden Common, WINCHESTER, SO21 1TH.
- (or: ...!uknet!mwuk!tony) | Tel: 0703 601990 Fax: 0703 601991
- ------------------------------------------------------------------------
- ** Any opinions are mine, not Microware's - but you knew that anyway. **
- ------------------------------------------------------------------------
-