[HN Gopher] CGA in 1024 colors - a new mode (2015)
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       CGA in 1024 colors - a new mode (2015)
        
       Author : tomduncalf
       Score  : 36 points
       Date   : 2024-01-02 19:34 UTC (3 hours ago)
        
 (HTM) web link (int10h.org)
 (TXT) w3m dump (int10h.org)
        
       | theandrewbailey wrote:
       | (2015)
        
         | dang wrote:
         | Added. Thanks!
        
       | tecleandor wrote:
       | This is about the "8088 MPH" demo for an original IBM PC (
       | previously in 2015: https://news.ycombinator.com/item?id=9338944
       | )
       | 
       | Then "succeeded" by "Area 5150" past year:
       | https://news.ycombinator.com/item?id=32394195
        
         | layer8 wrote:
         | It seems that a decent 8088/CGA version of Second Reality
         | should now be possible.
        
       | keithnoizu wrote:
       | and I felt like a rebel just using vga x mode.
        
         | 1letterunixname wrote:
         | Square pixel 360x240 was sane, but 360x480 always felt dirty.
         | 
         | IIRC, Mode X video mode set routines boiled down to an
         | exhaustive table of VGA register control values. (See SDL or
         | older FreeBSD for examples.) Then, the fun was pixel
         | addressing, bitblting, and page flipping.
        
           | p1mrx wrote:
           | > Square pixel 360x240
           | 
           | Did you mean 320x240?
        
       | dang wrote:
       | Related:
       | 
       |  _CGA in 1024 Colors - A New Mode: The Illustrated Guide (2015)_
       | - https://news.ycombinator.com/item?id=21992870 - Jan 2020 (69
       | comments)
       | 
       |  _CGA in 1024 Colors - A New Mode: The Illustrated Guide_ -
       | https://news.ycombinator.com/item?id=9386505 - April 2015 (11
       | comments)
        
       | hyperman1 wrote:
       | Look at the referenced IBM docs: They included the actual
       | schematics of the adapters. I don't know if they are 100%
       | complete, but even so, that level of technical detail is almost
       | unimaginable now.
       | 
       | (I hope the link works, otherwise, see e.g. page 19=28).
       | 
       | https://archive.org/details/bitsavers_ibmpccardsptionsandAda...
        
         | dekhn wrote:
         | that seems pretty typical for a datasheet?
        
           | userbinator wrote:
           | Try getting that level of documentation for a modern or even
           | just slightly older (as in a decade ago) GPU.
        
           | hyperman1 wrote:
           | The fact that the public could get these at all. I have
           | another one of these with the BIOS source code. I don't think
           | e.g. HP would publish a schematic or BIOS source for one of
           | their laptops today(I'd love it if you prove me wrong, of
           | course) . Otoh, I have an old 1960's tube radio, and the full
           | circuit is attached to the backplate, in the expectation that
           | you might want to replace a resistor some day.
        
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