On Sunday 30 June 2002 15:46, Frederik Boelens wrote:
> Why not just make the game in assembly in stead of TP?.
> Imho this seems much more diffecult, and with assembly you've got a lot
> more oppurtunities ;)
Programming in a higher level language is much easier, because you have things
like type checking, easy control statements (if, for, while), subroutine
calls with a parameter list, mathematical expressions are very compact etc.
I wouldn't recommend using assembly unless you absolutely need it, to get
maximum performance or to get maximum control over the system.
> > We now created the following situation in the source:
> > dw start,einde-04000h
> > dw start2,start
> >
> > and we get no errors anymore. But when we do this:
> >
> > dw start,einde-04000h+start2
> >
> > The error is back.....
> >
> > so it looks like the start2 is going wrong.
> >
> > but what does dw do?
"define word", it inserts a word in the output. For example, "dw 01234h"
inserts "034h, 012h" in the output (low byte is stored first in memory on
Z80). It's rather similar to "inline" in TP, I guess.
This particular dw is probably creating a BLOAD header. If so, the statement
before it is "db 0FEh" ("db" is "define byte"). The BLOAD header looks like
this:
db 0FEh ; magic number
dw start ; start address
dw end ; end address (inclusive)
dw exec ; execution address
It's the same as the parameters you add after a BSAVE command in BASIC.
Bye,
Maarten
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