Re: NTSC stops to exist on Apple //e?

[Don Bruder <dakidd@sonic.net>]

In article <7VjFg.10445$kO3.8898@newssvr12.news.prodigy.com>,
 "Bryan Parkoff" <nospam@nospam.com> wrote:

> Hello,
> 
>     What if NTSC monitor and television become obsolete?  The manufacturer 
> stops making NTSC.  It is going to replace HDTV.  How can we overcome NTSC 
> problem?  The answer is to use VGA monitor.
> 
>     We have enough information what we use schematic for Apple //e's 
> motherboard.  We should be able to redesign Apple //e's motherboard.  NTSC 
> circuit will be removed to replace VGA circuit.  Apple II 8-bit slots can be 
> replaced to PCI slots.  16MB RAM will be built in motherboard.  It is to be 
> 658C16 MPU.
> 
>     Video RAM will be located higher RAM above $E0 bank.  $400-$BFF for TEXT 
> and $2000-$5FFF for GRAPHIC ceases to exist and they will never be directed 
> to video.  We may use special routines to read video data from $400-$BFF for 
> TEXT and $2000-$5FFF for GRAHPIC before they are translated to video RAM in 
> $E0 bank.  Games in 658C16 code can be written to fill the RAM memory from 
> $200 through $FFFF as long.  Softswitches on $C000 through $CFFF will be 
> moved to higher RAM like $FF bank.  It has special switch to use 
> softswitches in $0/$1 bank for compatibility with Apple II.
> 
>     We can change the 14M crystal oscilloscope chip to 28M crystal 
> oscilloscope.  We know that NTSC has 15.7K horizontal freq and 60Hz vertical 
> freq (262.5 * 60Hz).  We want 640x480 resolution.  We are going to have 
> 31.4K horizontal freq and 60Hz vertical freq.
> 
>     28M crystal oscilloscope chip can cause 658C16 MPU to be 2 MHz and RAM 
> to be 4 MHz.  It is a problem.  I have a good understanding of timing 
> generator in HAL16R8 chip.  I should be able to modify timing generator to 
> run 1 MHz on 658C16 MPU and 2 MHz on RAM.
> 
>     We need to have a good understanding how VGA monitor work first.  What 
> do you suggest with my idea?
> 
> 
> Bryan Parkoff 
> 
> 

Didn't they call it "The Apple //gs" a few years back? :)

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