Elegant! :>)
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Sent: Thursday, September 6, 2018 12:00 PM
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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 <[email protected]>
To: Bob Supnik <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [Simh] DMA access to the IO page
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
> On Sep 5, 2018, at 10:13 PM, Bob Supnik <[email protected]> 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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