Re: CBM900 to SVGA monitor

From: Gerrit Heitsch <>
Date: Thu, 24 Jul 2014 20:59:45 +0200
Message-ID: <>
> * Surprisingly, there is no 8563 chip in the card. The whole card is
> built around TTL chips:

Well, the 8563 is the incarnation of the VDC with the 6502 bus 
interface. And while they said that the VDC was designed for the CBM900, 
I haven't been able to find out if they ever had working silicon or were 
only in the design stages as it the 900 canceled.

Also, the VDC will only handle up to 64KB while your card does more.

Is there a way you could post a picture of the mainboard of the system? 
If possible, with the writings on the ICs being readable. :)


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Received on 2014-07-24 20:00:02

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