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| From: Solder (all posts)
Date: 1998-11-18
Subject: Re: TED Timings
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On Mon, 16 Nov 1998 20:34:47 -0000, Tim Böscke wrote:
>I wonder whether anyone has exact timing diagrams of the TED signals ?
>I am especially interested in the MUX , RAS and CAS timing.
Hi Tim,
I have 3 sheets with diagrams from a multichannel logic-analyzer. Maybe that this can help you. Otherwise in the Commodore-Plus/4-Service-Manual are a lot of informations about the timing. The plus/4 uses a fixed raster for access to RAM and for Refresh with Crystal/10 (PAL). This is the RAS- and MUX-clock while RAS activates some ns before MUX switched the adress-multiplexer to the columns. The TED uses RAS-only-refresh,
this needs a generated row-adress by TED. Because it's only 8 Bit you can refresh max. 256kbit-chips with this.
Christian You will find infos for Commodore plus/4-homecomputers, OS/2-Warp, swap MP3's on my homepage http://surf.to/solder ICQ#: 22440587
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