Search found 80 matches

by olddb
Sun Dec 08, 2019 6:42 am
Forum: 2019 NESdev Competition
Topic: 2019 competition?
Replies: 6
Views: 5399

Re: 2019 competition?

When's the deadline for this year anyway?
by olddb
Mon Nov 11, 2019 9:31 pm
Forum: NESdev
Topic: Efficient way of comparing values greater than 8bit in 6502?
Replies: 2
Views: 1321

Re: Efficient way of comparing values greater than 8bit in 6

rainwarrior wrote:This is my favourite reference for the topic, and I refer to it often:
http://www.6502.org/tutorials/compare_beyond.html
Thank you.
This is what I was looking for:

LDA NUM1L
CMP NUM2L
LDA NUM1H
SBC NUM2H
by olddb
Mon Nov 11, 2019 8:58 pm
Forum: NESdev
Topic: Efficient way of comparing values greater than 8bit in 6502?
Replies: 2
Views: 1321

Efficient way of comparing values greater than 8bit in 6502?

Whats the most efficient way of comparing values greater than 8bit in 6502 for branch purposes?
Thank you.
by olddb
Sat Jun 29, 2019 2:32 pm
Forum: General Stuff
Topic: Theoretical 32 bit 65xx CPU idea
Replies: 5
Views: 8245

Re: Theoretical 32 bit 65xx CPU idea

High: ZZYYXXAA ;register size selector (both 10 and 11 are 32bit)
:cry: :cry: :cry:

Can we get away from the variable size registers concept?

How about more register with different sizes?
by olddb
Thu Mar 14, 2019 12:00 am
Forum: SNESdev
Topic: Wla suddenlygiving me wrong line for errors?
Replies: 1
Views: 3339

Wla suddenlygiving me wrong line for errors?

Wla suddenly giving me wrong line for errors?
Any idea why?

Thank you.
by olddb
Sat Feb 02, 2019 12:10 am
Forum: 2018 NESdev Competition
Topic: Squish!
Replies: 7
Views: 5731

Re: Squish!

Played a little bit. I like it.

Initial suggestion: give the level more contrasting tiles as it sometimes looks like the character is standing still.

Will play more and report.
by olddb
Sat Jan 26, 2019 8:57 pm
Forum: NESdev
Topic: Famicom Party: Making NES Games, 1985-Style
Replies: 17
Views: 10748

Re: Famicom Party: Making NES Games, 1985-Style

Wait! Tepples programmed HH86?
by olddb
Sun Dec 09, 2018 2:12 pm
Forum: SNESdev
Topic: bsnes-mcfly: The v073 and bsnes-classic killer
Replies: 180
Views: 85826

Re: bsnes-mcfly: The v073 and bsnes-classic killer

Seem your in a great space right now.

Best of luck to you.
by olddb
Mon Dec 03, 2018 1:43 pm
Forum: SNESdev
Topic: bsnes-mcfly: The v073 and bsnes-classic killer
Replies: 180
Views: 85826

Re: bsnes-mcfly: The v073 and bsnes-classic killer

What's up with byuu? He moved to Japan, stopped twitting and now is closing the forums?
by olddb
Sun Oct 21, 2018 4:06 am
Forum: Newbie Help Center
Topic: Code for rendering numbers and text into nametable?
Replies: 10
Views: 3188

Re: Code for rendering numbers and text into nametable?

Double dabble algorithm

Each decimal digit is stored in a nibble.


https://en.m.wikipedia.org/wiki/Double_dabble
by olddb
Fri Oct 19, 2018 8:09 pm
Forum: Homebrew Projects
Topic: Lizard Source Code
Replies: 15
Views: 10406

Re: Lizard Source Code

As a future project, I was thinking we could pool some money and create some sort of publishing unit for nesdev titles for the switch, ps4 xbox.

No idea how viable this would be, or how transparent it would be for the ones involved.
by olddb
Fri Oct 19, 2018 2:26 pm
Forum: Homebrew Projects
Topic: Lizard Source Code
Replies: 15
Views: 10406

Re: Lizard Source Code

We talked about this before, but are you planning a ps4 or switch version?
by olddb
Thu Oct 18, 2018 6:42 pm
Forum: GBDev
Topic: General Qs...
Replies: 4
Views: 5244

Re: General Qs...

Thank you.