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- Newsgroups: comp.sys.acorn.tech
- Path: sparky!uunet!inmos!fulcrum!bham!warwick!pavo.csi.cam.ac.uk!cl.cam.ac.uk!crj10
- From: crj10@phx.cam.ac.uk (Clive Jones)
- Subject: Re: Driving TTL Montiors
- Message-ID: <1993Jan28.174303.11683@infodev.cam.ac.uk>
- Telephone-Messages: +44 223 33 4900
- Sender: news@infodev.cam.ac.uk (USENET news)
- Address: Christ's College, Cambridge CB2 3BU, ENGLAND.
- Nntp-Posting-Host: easton.cl.cam.ac.uk
- Organization: Cambridge University Computer Laboratory
- References: <30824@castle.ed.ac.uk>
- Date: Thu, 28 Jan 1993 17:43:03 GMT
- Lines: 18
-
- In article <30824@castle.ed.ac.uk> rych@festival.ed.ac.uk (R Hawkes) writes:
- >We want to drive a RGB TTL monitor (i.e. an old BBC CUB
- >monitor) from an Archimedes and would like to know if anyone
- >out there has already tried it and if there are any problems?
-
- Not tried it, but know a little about the subject.
-
- TTL monitors (as opposed to analogue RGB monitors) accept *BINARY*
- signals on their RGB lines. That is, you can only have the primaries,
- complementaries, white and black. For the Archimedes, this is a bit of
- a let-down - yes, it will work (provided the levels trigger as 1s, and
- I *think* they would - just), but you won't be impressed.
-
- I believe Microvitec have foreseen this problem, however, and have a
- little modification they can do to make such CUBs accept analogue
- input. If you ask them, you might find that you're in luck.
-
- --Clive.
-