Re: [OT] Crazy idea: Design open-source graphics chip

From: Maciej W. Rozycki (macro_at_ds2.pg.gda.pl)
Date: 01/30/04

  • Next message: Xose Vazquez Perez: "[Compile Regression] 2.4.25-pre8: 126 warnings 0 errors" 
    Date:	Fri, 30 Jan 2004 19:11:59 +0100 (CET)
To: Timothy Miller <miller@techsource.com>

    On Fri, 30 Jan 2004, Timothy Miller wrote:

    > You're not entirely correct here. I attempted to write a VGA BIOS for a
    > card which did not have hardware support for 80x25 text.
    >
    > I first tried intercepting int 0x10. I quickly discovered that most DOS
    > programs bypass int 0x10 and write directly to the display memory. As a
    > result, very little of what should have displayed actually did.

     Of course, but DOS is not BIOS and the assumption is we want to use the
    adapter as a boot console and with Linux. The former is handled with
    appropriate firmware and the latter with a driver.

     Actually I had an opportunity to use a few PC/AT headless systems (no
    video adapter at all, although one could be placed in a PCI slot) with an
    option called "serial console redirection" in the firmware. Their BIOS
    setup program proved to work just fine over a serial line (unfortunately a
    VT100 terminal was assumed, so I had to type e.g. ^[OP to "press" <F1>,
    but it worked) as well any console output, including LILO (which had to be
    taught to use the regular console instead of accessing the serial port for
    I/O directly). 

    -- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +
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