Search found 5 matches

by happymaomao
Wed Oct 28, 2009 8:53 am
Forum: NESemdev
Topic: Where to find the instruction pointer in NES roms? Thanks!
Replies: 10
Views: 8032

Thanks tepples :D

I'm just a newbie of emu but loving NES very much. So I determine to implment a simple NES emulator using java. I may get lots of questions future. Thanks for helps from every superior in advanced.

^___^
by happymaomao
Wed Oct 28, 2009 8:12 am
Forum: NESemdev
Topic: Where to find the instruction pointer in NES roms? Thanks!
Replies: 10
Views: 8032

The size of rom is only 24k, and here is the header
78 69 83 26 1 1 0 0 0 0 0 0 0 0 0 0

So, I think no mapper.. :oops:

I just want to start with a simple rom so I use battle city as it. ^__^
by happymaomao
Tue Oct 27, 2009 9:38 am
Forum: NESemdev
Topic: Where to find the instruction pointer in NES roms? Thanks!
Replies: 10
Views: 8032

Thanks my friend. Thanks for your patience. :-}

Two great helpful pages!!

Thanks again!
by happymaomao
Tue Oct 27, 2009 9:26 am
Forum: NESemdev
Topic: Where to find the instruction pointer in NES roms? Thanks!
Replies: 10
Views: 8032

Thx, my friend~! I took it wrongly.

If the PRG rom is only 16k, it would be saved at both $8000 and $c000

So I can find the instruction pointer at $FFFE.

However, I saw some of the code do this at $FFFC. Is there any difference between these two ways?

Thanks again!!
by happymaomao
Tue Oct 27, 2009 8:58 am
Forum: NESemdev
Topic: Where to find the instruction pointer in NES roms? Thanks!
Replies: 10
Views: 8032

Where to find the instruction pointer in NES roms? Thanks!

I've been troubled by this problem a long time. I searched the web and some one said the starting value can be found at 0xfffe. However it's already out of the rom size (the size of rom is only 24k). So can anyone help to tell me where to find this starting value in roms? Thanks for your help!! :D :D