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computers / comp.sys.ibm.ps2.hardware / Re: Japanese Display Adapters and PS/2s

SubjectAuthor
* Japanese Display Adapters and PS/2sLouis Ohland
`- Re: Japanese Display Adapters and PS/2sLouis Ohland

1
Japanese Display Adapters and PS/2s

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From: ohl...@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Japanese Display Adapters and PS/2s
Date: Wed, 14 Jul 2021 11:09:43 -0500
Organization: csiph.com Internet News Service
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 by: Louis Ohland - Wed, 14 Jul 2021 16:09 UTC

https://ardent-tool.com/sandy55/Video/PS55_DA.html

https://ardent-tool.com/sandy55/Video/CHKMON.EXE

Japanese Display Adapters and PS/2s

The Japanese Display Adapters were designed to be used with IBM Japan's
specialized JDOS. It has been said that the AVEC display adapters can't
be used with the PS/2 line, but the BVEC and DA-J adapters supposedly
can. I'm not sure about these claims but I've once used one of the
Japanese display adapters with the 8570 25 MHz planar. I don't remember
exactly which card have I used. Anyway, in order to get color signal
from one of the "PS/2 compatible" display adapters you will have to use
the following trick.

To get color image you have to add CHKMON.EXE to your AUTOEXEC.BAT (the
utility can be also found on the Reference Diskette). This may be
necessary only for adapters predating the DA B-II card, the later DBCS
adapters may work out of the box, but I'm not sure. I've confirmed this
using PS/2 Model 8570 with the 25 MHz planar and D/A-III.

Re: Japanese Display Adapters and PS/2s

<scn2tn$2bb8$1@842ffb22-07e1-11e5-a459-00266cf00584.csiph.com>

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From: ohl...@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Re: Japanese Display Adapters and PS/2s
Date: Wed, 14 Jul 2021 11:14:35 -0500
Organization: csiph.com Internet News Service
Message-ID: <scn2tn$2bb8$1@842ffb22-07e1-11e5-a459-00266cf00584.csiph.com>
References: <scn2kj$2b51$1@842ffb22-07e1-11e5-a459-00266cf00584.csiph.com>
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 by: Louis Ohland - Wed, 14 Jul 2021 16:14 UTC

First - the PS/55 adapters don't implement the Display ID feature
that normally uses pins 4, 11, 12, and 15 to identify the connected
display unit. This alone however shouldn't cause any compatibility issues.

Perhaps the system board VGA detects the monitor and configures, and the
AVEC can't detect color, so comes up as mono?

On 7/14/2021 11:09, Louis Ohland wrote:
> https://ardent-tool.com/sandy55/Video/PS55_DA.html
>
> https://ardent-tool.com/sandy55/Video/CHKMON.EXE
>
> Japanese Display Adapters and PS/2s
>
> The Japanese Display Adapters were designed to be used with IBM Japan's
> specialized JDOS. It has been said that the AVEC display adapters can't
> be used with the PS/2 line, but the BVEC and DA-J adapters supposedly
> can. I'm not sure about these claims but I've once used one of the
> Japanese display adapters with the 8570 25 MHz planar. I don't remember
> exactly which card have I used. Anyway, in order to get color signal
> from one of the "PS/2 compatible" display adapters you will have to use
> the following trick.
>
> To get color image you have to add CHKMON.EXE to your AUTOEXEC.BAT (the
> utility can be also found on the Reference Diskette). This may be
> necessary only for adapters predating the DA B-II card, the later DBCS
> adapters may work out of the box, but I'm not sure. I've confirmed this
> using PS/2 Model 8570 with the 25 MHz planar and D/A-III.

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