Re: Ultimax questions

From: Gerrit Heitsch <>
Date: Tue, 22 Oct 2013 19:36:27 +0200
Message-ID: <>
On 10/22/2013 07:22 PM, Bil Herd wrote:
> Hi Giovi,
> Mostly it was about getting to CES where afterwards we could "catch our
> breath" and use the combined knowledge and wisdom of the chip design team to
> help administer guidelines and advice to the 8563 project.  Prior to CES
> everyone was too busy to watch other people's work unless it became a show
> stopper (almost did).  The designer if the 8563 had felt prior to CES that
> since there will always be a problem with synchronization between two clocks
> (and metastability and all of that) that it didn’t make since to try and
> reduce the chance of error  further.  I believe a couple of the designers
> cornered him and explained the difference between an error every
> 1x10exponet8 and 1x10exponet22.
> In some ways I think it also stayed broken or at least hard to use, for
> example 256 byte move is not very useful.

Better than no move at all, especially with the bottleneck you had to go 
through in order to access the display RAM for the VDC.

Have you seen some of the things people do with the VDC?

> Also they fixed and added several things after I was gone in the 64k VDC, by
> then I don’t know if Commodore was so CES show driven.

I thought all VDCs in the C128 are able to work with 64K, you just have 
to replace the 41416 DRAMs with 41464?


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Received on 2013-10-22 18:03:01

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