Jump to content
YSG2020

Any way to improve XEP80 composite video output?

Recommended Posts

Does anybody know if it’s possible to improve the XEP80’s composite video output?  Does it have a 4050 chip inside it? Would installing a UAV make any improvement?

Or is the XEP80 completely limited to its existing poor quality composite out?

thx. 

Share this post


Link to post
Share on other sites

What kind of display are you trying to use it with? It's designed to be used with monochrome monitors that do not try to derive a colour picture from the signal.

 

The XEP 80 is "compatible with a "composite" video monitor and will show a picture, but the signal is high enough resolution that using a composite input in a colour monitor will probably be blurry with lots of colour artifacting. The closest you could get is by connecting the XEP-80's output to the Luma input of a colour monitor with an S-Video input (with no Chroma input)

Share this post


Link to post
Share on other sites

I was thinking to use a powered converter box and feed the improved composite or svid signal into an SVGA crt.   Possible?? Or is there not enough native video circuitry in the XEP80 to work with? 

Share this post


Link to post
Share on other sites

Bob Woolley did a simple hack that allows you to hook up a PC monochrome monitor to the XEP80. I think it even got published in Atari Classics magazine. Probably in the SLCC Journal, also.

 

Bob

 

 

Share this post


Link to post
Share on other sites

Hello Bob

 

It was published in Atari Classics Magazine, as I say on my Special Stuff Page.

 

Sincerely

 

Mathy

Share this post


Link to post
Share on other sites
9 minutes ago, bob1200xl said:

Bob Woolley did a simple hack that allows you to hook up a PC monochrome monitor to the XEP80. I think it even got published in Atari Classics magazine. Probably in the SLCC Journal, also.

 

Bob

 

 

And my post below it...

Edited by AtariGeezer
  • Thanks 1

Share this post


Link to post
Share on other sites

You know what would look awesome... An XEP80 with the TTL mod done, and then adapted to an ominous looking TTL orange/red gas plasma display like on the IBM P70.  I'd love to see someone figure this out.   It would be the ultimate super rare holy grail vintage monitor setup on the Atari XEP80.  If someone can do this, please post photos and a how-to for the TTL adapter to the IBM gas plasma screen.

 

gas plasma.JPG

  • Like 1

Share this post


Link to post
Share on other sites
10 hours ago, YSG2020 said:

You know what would look awesome... An XEP80 with the TTL mod done, and then adapted to an ominous looking TTL orange/red gas plasma display like on the IBM P70.  I'd love to see someone figure this out.   It would be the ultimate super rare holy grail vintage monitor setup on the Atari XEP80.  If someone can do this, please post photos and a how-to for the TTL adapter to the IBM gas plasma screen.

 

gas plasma.JPG

I had an IBM "Portable" PC with an Orange screen like that, wish I had removed the screen when I dumped the PC

It was always crisp and clear.

Share this post


Link to post
Share on other sites

Is there a list of software that supports the XEP 80?  Can't be that much out there.

Share this post


Link to post
Share on other sites

Hmmmm,

 

there are various topics here at AA about the XEP-80 and some of them list some software (most of the time: AW 80). Here are the few XEP-80 programs I know, maybe someone can enhance the list:

 

- XEP-80 disk (DX 5087) with drivers and sources (by Atari)

- Atari Writer 80 (by Atari)

- Turboword (by Micromiser): Abbuc PD 707

   (you must be logged in to download this)

- Silent Butler 80 (by Atari): AA topic

- several PD and demo disks: Abbuc PD 0471

(Info-Disks with TB XL, Bibo-DOS and other stuff for the XEP-80)

 

Anything else ? I do not own an XEP-80, so I only list here, what I have read...

See also subject 6.1.2 of the A8FAQ.

 

Share this post


Link to post
Share on other sites

Does Last Word support the XEP80 for editing or only for print preview or not at all?

 

Also, yes those gas plasma displays are super rare now and very collectable. They are the same screens used in pinball games but nobody makes one anymore as a computer monitor display.  All of the old ones are either TTL or proprietary connections - Very hard to hook up to them without an array of adapters and video processors to match. I’d buy a P70 just to rip the screen off it though if I could find one cheap and working! Other than the IBMs they came only on a few select Toshiba and Compaq ‘portables’.  Prone to burn in, but essentially a miniaturized  Nixie tube monitor.  There’s nothing vintage-retro computing cooler than that. 

Edited by YSG2020

Share this post


Link to post
Share on other sites
36 minutes ago, YSG2020 said:

Does Last Word support the XEP80 for editing or only for print preview or not at all?

Not at all, although I played with a version which supported XEP-80 some years ago.

  • Thanks 1

Share this post


Link to post
Share on other sites

Hello YSG2020

 

19 hours ago, YSG2020 said:

You know what would look awesome... An XEP80 with the TTL mod done...

 

Bob Woolley describes a TTL mod for the XEP80 on page 16 of Atari Classics Volume 2 Number 6.

 

Sincerely

 

Mathy

  • Like 1

Share this post


Link to post
Share on other sites

There are plenty of composite monitors that the XEP80 works with that are amber... not really much need for the TTL mod.

Share this post


Link to post
Share on other sites

Any XEP80 experts here that might know a cure for this display I’m getting out of my XEP80 composite into a converter box and then out to SVGA monitor. Thx for any suggestions to fix.   Would the TTL mod on this xep80 for this samsung 763MB monitor possible fix this I wonder?  The monitor specs say it can accept a TTL vertical sync as an option.  ???

4CEF45FA-3D9A-439F-9B19-FB3712EA29CD.jpeg

Edited by YSG2020

Share this post


Link to post
Share on other sites

Make sure the monitor you are using is 15.75kHz horizontal refresh, not 31kHz.  Failing that - not sure.  Whatever the issue, it is related to a synch problem.

  • Thanks 1

Share this post


Link to post
Share on other sites

OK, hooked the XEP80 to my Samsung LED TV using the composite out on the XEP to the Component (green) in on the back of the TV, and it miraculously works just fine and I have a sharp clear black and white screen, albeit the screen offsets are off and need adjustment to fit the entire 80 column screen properly centered.  It's interesting that the component green signal adapted is the correct composite signal the XEP80 uses... Is this a Luma only signal on this line?  So, the XEP80 is confirmed working.  The question now is, how do I get the composite out of the XEP, separated to component (green) signal and then into my SVGA monitor I am using with the Atari?   Would a component to SVGA adapter cable work possibly, or do I need yet another powered converter box to accomplish this?

Edited by YSG2020

Share this post


Link to post
Share on other sites

I believe that horizontal offset is due to the wrong sync polarity. HSYNC may need to be positive, not negative. (or, maybe the other way around)

 

Bob

 

  • Thanks 1

Share this post


Link to post
Share on other sites
Posted (edited)

Bob and Stephen I think you both nailed it. I checked the frequency and sync polarity’s on both my Older multisync crt monitor and my new led tv, and it turns out the newer tv has over 3 times as many frequency sync and polarity option resolutions avail than the old multisync monitor, which is ironic.  It would appear the old crt just isn’t wired for the particular frequency, resolution, and sync polarity match that the XEP80 is outputting, which is a shame , because it is a flatscreen aperture grill crt similar to a trinitron which was of the highest quality when it was new. Guess I need to get a Sony PVD or Commodore monitor instead. Bummer.  

Edited by YSG2020

Share this post


Link to post
Share on other sites
7 hours ago, bob1200xl said:

I believe that horizontal offset is due to the wrong sync polarity

Somewhere a Star Trek writer is tickled pink that for once, reversing the polarity is an actual thing.

 

Yes, I'm aware it can apply as a concept regularly in electronics. And often when involving power is a bad idea, actually, which is why it was always so amusing to me when it came up on scifi shows. Sounds so much better than did you plug it in the right way though.

  • Haha 3

Share this post


Link to post
Share on other sites

Anybody ever tried hooking up the Atari ST monochrome monitor to the XEP80?  I see it has a composite pin on its 14 pin din connector.  I wonder if it’s frequency and sync polarity would match???

Share this post


Link to post
Share on other sites

OK... Answered my own question.. Not possible.  The XEP80 outputs 15khz horizontal sync and the Atari SM124 is a 30Khz hor sync.  :(   Apparently the SC1224 is a 15khz monitor though.. so i'm going that route now.,, or possibly a Sony PVM. 

  • Like 1

Share this post


Link to post
Share on other sites
On 2/16/2020 at 2:38 PM, Mathy said:

Bob Woolley describes a TTL mod for the XEP80 on page 16 of Atari Classics Volume 2 Number 6

 

Does anyone have the details of that mod?

 

I tracked down the article to the San Leandro Computer Club(SLCC) - Atari Newsletter 1988.

 

I found a scan of the news letter at the Internet Archive

 

But the scan isn't very good, apparently we have to:

 

* The wiring required is: (from the bottom of the XEP80 board)

* Pin t and 2 of 9 pin socket to pin ? of U6.

* Pin 7 of 9 pin socket to the pad 1/4 inch to the left of pin 8 of U6. (This pad is the same distance to the LEFT of pin 8 as pin 7 is to the RIGHT of pin 8*)

* Pin 8 of 9 pin socket to pin 9 of U6,

* Pin 9 of 9 pin socket to pin 10 of Ud

 

 

Share this post


Link to post
Share on other sites

OK, I have to ask. Why do we have two virtually identical threads started by the same OP going at once? Not only that, but copy/paste cross-posting posts between the two seems kind of silly. Let one of them die and keep the most relevant one going, please.

  • Like 3
  • Thanks 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...