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

[pausch@saaf.se (Paul Schlyter)]

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?

That's already happening.... :-)

NTSC, PAL and SECAM will all eventually be replaced with digital
television formats, be it HDTV or SDTV.  In my country, Sweden,
ground-based PAL TV transmissions will cease completely in less
than 1.5 years - parts of the country already has digital-only
ground based TV transmissions.  Satellite TV transmissions in PAL
ceased several years ago.  PAL will probably continue to live some
additional years in the cable TV networks though, but in some
15 to 20 years PAL will probably be completely gone (except among
those who enjoy using vintage equipment).

NTSC will most likely meet the same fate.


>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 
>
>


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