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Who wrote this stuff?
This trivia was originally written by Jim Brain as part of the now long defunct C= Hacking Magazine, but happily Jim has kindly agreed to let me reproduce it in HTML-ized format for retro computing fans everywhere.

If you are interested in seeing the Commodore Trivia digests in their original form, take a look at this website.

For those who are interested, these pages were generated from the original text files using Perl and Velocity (and a nice template originally found here)


	We all know that VIC stands for Video Interface Chip.  However,
        in what computer was a VIC chip first used?

	The VIC-I was used in the VIC-20.

	What is the difference between the 6566 and 6567 VIC chips?

	The 6566 has fully decoded address lines.  The '67 has multiplexed
        address lines for connection to DRAM.

	On what computer would one find a VIC-II chip?

	C64, C64C, 64SX.

	On what computer would one find a VIC-IIe chip?

	C128, C128D

	On what computer would one find a VIC-III chip?

	C65 (64DX)

	Versions of each VIC chip exist for each computer model/video
        standard combinations suppoerted by Commodore.  What model/video
        standard would the 6569 work with?

	C64 type machine using the PAL-B standard.  Note that there are also
        PAL-N and PAL-M standards, which required different VIC-II models.

	How much memory could be directly addressed by a VIC-II chip?

	16 kilobytes.

	How many control registers does the VIC-I contain?

	16 control registers.

	How many control registers does the VIC-II contain?

	47 control registers.

	The VIC-II series introduced Movable Object Blocks to the
        Commodore programmer.  By what common name are MOBs known?


	What are the dimensions of a MOB?

	24 dots wide by 21 tall.

	What difference between the VIC-I and VIC-II causes VIC-II equipped
        systems to potentially operate slightly slower than VIC-I equipped
        systems, all other items held constant?

	The dot clock on the VIC-I is only 4 times the processor clock.  
        That is, the VIC-I can fetch 2 bytes for each 1 byte data (8 pixels) 
        it displays, without stopping the processor.  But the VIC-II has 
        narrower pixels, because the dot clock is 8 times processor clock, 
        and as a result, it only can read 1 byte for each byte (8 pixels) it 
        displays.  This is sufficient for fetching the character images, but the
        processor must be stopped to fetch the character codes (and colours).
        (Thanks to Marko Makela for this explanation)

	In addition to supporting graphical output to an external display,
        what other vitally important function do the VIC chips (starting
        with the VIC-II) perform?

	They refresh the Dynamic RAM of the computer periodically.  If the
        DRAM is not refreshed, it would lose its contents.

	Many people know that the VIC-II can deliver up to 320x200
        resolution without much trouble.  What is the maximum resolution of
        the VIC-III chip?

	According to the specifications, it is supposed to handle 1280H by
        400V interlaced and non-interlaced.  

	Between the development of the VIC-II and the VIC-IIe, there was a
        related, though not very similar video IC developed for CBM machines.
        Name its TLA (three letter acronym).

	TED (Text Editting Device).  It was developed for the 264 series
        (Plus/4, C16).

	How many pins does a VIC-II chip contain?

	Every VIC-II has 40 pins.  
The information in this between the lines marked by (BEGIN) and (END)
is copyright 1996 by Jim Brain.  Provided that the information
between the (BEGIN) and (END) lines is not changed except to correct
typographical errors, the so marked copyrighted information may be
reproduced in its entirety on other networks or in other mediums.  For 
more information about using this file, please contact the address 
shown below.
Jim Brain
10710 Bruhn Avenue
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(402) 431-7754
--------Commodore Trivia Edition #31 Questions and Answers (END)---------


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