On Wed, Jul 1, 2009 at 11:37 PM, William "Chops" Westfield
<westfw@mac.com>wrote:

> How about:
>     /*
>      * Our console uart is memory mapped
>      */
>     struct uart_type *console = (struct uart_type *)0x801000;
>
> Please provide a pascal example that works with at least two different
> vendors' pascal compilers.  Of course, this is extremely "dangerous",


I do not know any other Pascal than Turbo Pascal, but with that you could
declare a variable right on top of a memory location you desire:

var myloc : byte absolute $891000;

you could do things like this:

reg.ax:=$0003;
intr($10,reg);

or

mem[$A000: y*320+x]:=c;

you have pointers, binary operators -- but you do not have bitfields and
printf format strings. I think only these two things were what I liked a bit
more in C plus the for loop in C. What hard was to learn is why can't i just
define specific index range for an array and why the switch..case has that
few possibilities in C. Also that there is no equivalent of 'with' directive
in C and that I could not declare functions inside other functions. Actually
I did feel that C was a backup after Turbo Pascal and pain to use, but that
was the stream you had to swim in.

Tamas




>
> but I think it's a fine example of exactly the sort of thing that
> caused less dangerous languages to be dismissed from consideration for
> "systems" programming.
>
> BillW
>
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