Re: about the plus4

From: Gerrit Heitsch <>
Date: Thu, 19 Apr 2012 19:03:55 +0200
Message-ID: <>
On 04/19/2012 06:37 PM, Anders Carlsson wrote:

> It actually shines a little more light on why the TED project lived on,
> assuming Commodore needed a cheaper alternative to the VIC-II for future
> entry level computers.

A few features were only found on TED and, as far as I know, never used 
again in any other Commodore video controller:

- switching between normal and double CPU clock depending on whether
   the video circuit needs to fetch video data or not (much better
   IMHO than the all or nothing approach in the C128)

- hardware text cursor

- hardware blinking

- hardware reverse characters

- adjustable luma levels for each color

- writable row and column counters in video circuit.

- full 64KB access for the video circuit so you were able to place
   the character ROM and video RAM anywhere you wanted, including
   under the ROM.

- Same chip for PAL and NTSC, selectable by software, allowing for
   easy overclocking if you have a PAL 264.

The last one sorta came back with the 8372 in the Amiga, without the 
overclocking part though.


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Received on 2012-04-19 18:00:05

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