Hercules GB200 with IBM 5151

[Tincanalley]

If I set the MB switches to monochrome, will this card run a 5151 or do I need a monochrome only adapter? The 5150 I just restored came with the GB200, but I don't have a CGA. For now I have a Paradise VGA installed and a CRT monitor. Want a period correct setup, so I need to figure out the route I have to take.

Also, how common is it for the IBM monochrome adapter to fail? The reason I ask is that most of the reasonably priced ones on ebay are sold as is/untested. I know from experience that some sellers will sell a known non-functioning item by noting it is untested and as is with no returns. I just got a non-working 5151 and am determined to revive it. Got the oscilloscope out and the service manual. When the monitor arrives I'm hoping it will be an easy fix.

Thanks!

 

[ajacocks]

Timcanalley,

It looks like the GB200 (color card) is a direct clone of IBM CGA. So, you do need a monochrome adapter. This eBay listing has some pictures of the manual, which confirm that:

https://www.ebay.com/itm/144042686904



As to your second question, I don’t think it’s very common for an MDA card to fail. I would suggest a Hercules monochrome card, though, as they can use the same monitors, and the Hercules is much more flexible than MDA.

- Alex

 

[Tincanalley]

Bummer. Well I start looking for a Hercules GB102 (I think that's the right one).

 

[Tincanalley]

I just purchased a used/working GB112. I should be good to go and will be able to leave the CGA installed as well.