IBM 5151 failure \ VOGONS

IBM 5151 failure

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First post, by Exteban

Posted on 2020-02-06, 16:16

Exteban Offline

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Joined: 2020-02-06, 16:07

Hello!
Hi. I have an IBM 5151 monitor connected to an IBM 6150. When the system starts, the image looks in triplicate:

https://photos.app.goo.gl/WyRNK3tb3vgq9WGi9

But when you load the RAM, the image is fixed. I think it's because of the DCMON.COM command that is at the start of the autoexec.bat

I tried to connect the monitor to an Amstrad PPC 512, but I have the same problem. I have played with the switches, and with modes 80 and 90, but no result. And the DCMON.COM freezes the equipment.

Any ideas?
Thank you 😊

Reply 1 of 3, by Deunan

Posted on 2020-02-06, 17:30

Deunan Offline

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Exteban wrote on 2020-02-06, 16:16:

Hi. I have an IBM 5151 monitor connected to an IBM 6150. When the system starts, the image looks in triplicate:

I know nothing about the 6150 series but the 5151 monitor is for MDA and that card is rather unusual - it has 50Hz vertical refresh rate. So my guess is you are just not getting a lock, and frankly not many computers out there would output 50Hz signal to a monitor (PAL TVs are another story).

Reply 2 of 3, by Exteban

Posted on 2020-02-07, 09:22

Exteban Offline

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Deunan wrote on 2020-02-06, 17:30:

Exteban wrote on 2020-02-06, 16:16:

Hi. I have an IBM 5151 monitor connected to an IBM 6150. When the system starts, the image looks in triplicate:

I know nothing about the 6150 series but the 5151 monitor is for MDA and that card is rather unusual - it has 50Hz vertical refresh rate. So my guess is you are just not getting a lock, and frankly not many computers out there would output 50Hz signal to a monitor (PAL TVs are another story).

Maybe you are right. On both computers the image flickers, but when DCMON.COM is activated, the image has an amazing sharpness in IBM.

Reply 3 of 3, by Stiletto

Posted on 2020-02-14, 07:09

Stiletto Offline

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Exteban wrote on 2020-02-06, 16:16:
Hello! Hi. I have an IBM 5151 monitor connected to an IBM 6150. When the system starts, the image looks in triplicate: […]
Show full quote

Hello!
Hi. I have an IBM 5151 monitor connected to an IBM 6150. When the system starts, the image looks in triplicate:

https://photos.app.goo.gl/WyRNK3tb3vgq9WGi9

Hi, this image doesn't display because you have linked an empty album on Google Photos.

In the future, feel free to attach the photos at VOGONS or Imgur and the like.

If you really want to use Google Photos, see here for my procedure for posting from Google Photos:
Re: Televideo Telewave Audio 32 sound card, questions about its onboard wavetable ROM

"I see a little silhouette-o of a man, Scaramouche, Scaramouche, will you
do the Fandango!" - Queen

Stiletto

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