[Simh] Simh Digest, Vol 176, Issue 18

[Jack Rubin]

Elegant! :>)

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Sent: Thursday, September 6, 2018 12:00 PM
To: simh at trailing-edge.com
Subject: Simh Digest, Vol 176, Issue 18

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Today's Topics:

   1. Re:  DMA access to the IO page (Paul Koning)


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Message: 1
Date: Thu, 6 Sep 2018 09:16:21 -0400
From: Paul Koning <paulkoning at comcast.net>
To: Bob Supnik <bob at supnik.org>
Cc: "simh at trailing-edge.com" <simh at trailing-edge.com>
Subject: Re: [Simh] DMA access to the IO page
Message-ID: <A93F8E36-6F79-41C2-9D81-A3A3023E75F1 at comcast.net>
Content-Type: text/plain;	charset=us-ascii



> On Sep 5, 2018, at 10:13 PM, Bob Supnik <bob at supnik.org> wrote:
> 
> Apparently, the GT40 does this. So... problems.

FWIW, I've done this too, in college on our 11/20.  That was for a primitive CRT display (an X/Y scope attached to an AD11 (?) D/A converter) which had its data fed to it by DMA from the RC11 system disk.  It was set to write to the D/A data register, with bus address increment inhibit set.  Crude, but it worked.

	paul



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End of Simh Digest, Vol 176, Issue 18
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