Wla byte defining

Celius · Post by **Celius** » Mon Jun 25, 2007 1:26 pm

For my game, I really need to do something like this:

.db #<Lable, #>Lable

#>Lable: High address of Lable
#<Lable: Low address of Lable

But WLA doesn't seem to support that. Is there a way to define bytes as the High/Low addresses of a lable?

dXtr · Post by **dXtr** » Mon Jun 25, 2007 3:16 pm

according to the docs it do support < and >

The following operators are valid:

(, ), | (or), & (and), ^ (power), << (shift left), >> (shift right), +, -,
# (modulo), ~ (xor), *, /, < (get the low byte) and > (get the high byte).

dXtr · Post by **dXtr** » Mon Jun 25, 2007 3:22 pm

edit:
I checked some old SNES code I got, it looks like your not supposed to add the "#".

tokumaru · Post by **tokumaru** » Mon Jun 25, 2007 3:45 pm

Celius wrote:.db #<Lable, #>Lable

The "#" should only be used for immediate addressing, not for defining bytes. AFAIK it is like this in every 6502 assembler, not only WLA...

Disch · Post by **Disch** » Mon Jun 25, 2007 3:51 pm

Also, if there's a .db that does bytes, there's probably a .dw that does words

.dw label

is simpler than

.db <label, >label

tokumaru · Post by **tokumaru** » Mon Jun 25, 2007 5:46 pm

Disch wrote:.dw label

is simpler than

.db <label, >label

In this case, it would seem so. But sometimes it really is better to break lists of 16-bit values into 2 lists of 8-bit values (list of high bytes, list o low bytes), because of indexing. I'm sure everyone knows that, but I'm just pointing it out.

Celius · Post by **Celius** » Mon Jun 25, 2007 7:28 pm

Okay, yeah, I have it working now. I didn't need the '#'. I never really thought about that, I guess. Thank you for telling me.

nesdev.org

Wla byte defining

Wla byte defining

Re: Wla byte defining