[Simh] Simh Digest, Vol 176, Issue 18

[Jack Rubin]

Elegant! :>)

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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 <***@comcast.net>
To: Bob Supnik <***@supnik.org>
Cc: "***@trailing-edge.com" <***@trailing-edge.com>
Subject: Re: [Simh] DMA access to the IO page
Message-ID: <A93F8E36-6F79-41C2-9D81-***@comcast.net>
Content-Type: text/plain; charset=us-ascii

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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