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- Path: jobe.shell.portal.com!jkesling
- From: jkesling@shell.portal.com (John Darrell Kesling)
- Newsgroups: comp.sys.amiga.hardware,comp.sys.amiga.misc
- Subject: Re: IBM monitor
- Followup-To: comp.sys.amiga.hardware,comp.sys.amiga.misc
- Date: 18 Jan 1996 06:55:46 GMT
- Organization: Portal Communications Company -- 408/973-9111 (voice) 408/973-8091 (data)
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- Message-ID: <4dkqti$elr@news1.shell>
- References: <4d5kr8$uqa@osfb.aber.ac.uk>
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-
- DOMINIC TRISTRAM (dbt3@aber.ac.uk) wrote:
-
- >I recently got an old IBM 5081 19 colour monitor
- >(20 inch) for the bargain price of nothing!
- >Needless to say, I'd love to get this baby to
- >work with my 1200, so can anyone answer these
- >questions (or know of anyone who could)..
-
- Back when that monitor came out I worked for IBM. I don't remember
- all of the specs for it but I'll try to answer some of your questions.
-
- It was first introduced as part of the "5080 Graphics System", a
- graphics workstation designed to be driven by large IBM mainframes.
- After that it was used with the IBM RT PC, an early RISC based unix
- system. And then on the IBM RISC System, the system that replaced
- the RT PC. A few years ago the 5081 was replaced by the 6091.
-
- >1) There are six BNC type connectors on the back
- > (2 rows of three). Each row has a connector
- > coloured Red Green and Blue. The top row has
- > a 'arrow pointing into a circle' symbol, and
- > the bottom row has a 'arrow pointing out of
- > a circle' symbol. Anyone know whats going-on
- > here? Presumably one row is RGB, and the other
- > is sync or something...
- > There is also a dip switch with three positions
- > (0, 1 and 2). What does this do?
-
- One set is video in and the other set of connectors is video out
- (passthrough). I think there is also a switch on the back to
- enable or disable termination on the video inputs.
-
- The sync is combined with the green video.
-
- >2) Does the monitor scan at 15khz? Or 70? Ideally,
- > I'd love it to work with Super 72 (which I use
- > with my Microvitec 1438)
-
- Somewhere in between if I remember correctly. Somewhere in the
- 35-50khz range I believe. I do know that it is not a multiscan
- monitor, it is only designed to work at one fixed horizontal
- and vertical frequency. I also seem to remember that the
- early ones had a 50hz vertical rate and the later ones had
- a 60hz rate.
-
- I do remember that the horizontal rate is higher than standard
- VGA. I think standard VGA is around 32khz. We had two video
- projection systems, one would handle all of the displays
- we had including the 5081 and the other would handle everything
- but the 5081 including VGA. At the time there was no SVGA.
-
- >Any help much appreciated. And before you ask, yes
- >I did 'phone IBM!
-
- >Dominic
-
- I may have some old specs around here someplace. If I dig anything
- up I'll post the additional details.
-
- There is a fairly active news group for the RT PC. I
- think it's either comp.sys.ibm.rtpc or comp.sys.ibm.pcrt. You
- can probably find a more informed answer there.
-
- Good luck,
- John
- --
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- John Kesling - jkesling@shell.portal.com or jkesling@norden1.com
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- WA8ZGO - via AX.25 packet radio WA8ZGO@W8HHF.OH.USA
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