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NNTP-Posting-Date: Sun, 20 Mar 2005 12:54:30 -0600
From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Bare metal text I/O in Ada
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Date: 2005-03-20T12:54:30-06:00
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>keyboard input and text output to EGA / VGA on a bare metal (no
>operating system) AMD (Intel clone) platform.
  No PC-style BIOS ROM either?
  It's trivial to write text to video RAM given the set of bits to
draw letters, eg
  type Bytes is mod 256;
  type Rows is array (0 .. 7) of Bytes;
  Letter : constant array(Character) of Rows
    :=((16#00#,16#00#,16#00#,16#00#,16#00#,16#00#,16#00#,16#00#),
  etc.
"Programmer's Problem Solver for the IBM PC, XT, and AT", Robert Jourdain,
has a section on programming the keyboard interrupt for those machines,
but it's probably not applicable to truly different bare hardware.