Search found 22221 matches

by tepples
Sat Jun 19, 2021 7:12 pm
Forum: NESdev
Topic: Somebody is selling my game
Replies: 13
Views: 737

Re: Somebody is selling my game

But taking the next step to make profit from it kind of sours the whole thing for me and makes me lose a lot of respect for those folks that try to do that. Your passion alone should be enough to drive the project, and if not, it's not a very passionate project. If someone needs to pay you to write...
by tepples
Fri Jun 18, 2021 8:12 am
Forum: NESdev
Topic: Somebody is selling my game
Replies: 13
Views: 737

Re: Somebody is selling my game

I've seen ocdreproductions before. They're also selling 240p Test Suite, god knows which old version. I'd be willing to work with them to help them come into compliance with the GPL if I had the time, but I'm off to my day job.
by tepples
Sun Jun 13, 2021 8:26 pm
Forum: Newbie Help Center
Topic: Trying to dump my first NES game... :)
Replies: 60
Views: 30110

Re: Trying to dump my first NES game... :)

Title screen graphics of this 190-in-1 look a bit like 100-in-1 Contra Function 16. Based on reading the schematic, I count these: D0-D1: CHR A13-A14 A0-A4: CHR A15-A19 A5: 16K or 32K A6: PRG A20 A7: mirroring control A8: 16K mode: Lower or upper half of 16K bank A9-A13: PRG A15-A19 Looks very simil...
by tepples
Fri Jun 11, 2021 8:04 pm
Forum: NESemdev
Topic: Handling Illegal Opcodes
Replies: 10
Views: 1342

Re: Handling Illegal Opcodes

The stable unofficial opcodes behave the same way in the NES as they do in the Atari 2600, Commodore 64, and unenhanced Apple II (at least with decimal mode off).
by tepples
Thu Jun 10, 2021 6:45 am
Forum: NES Hardware and Flash Equipment
Topic: Big RAM on FME-7: I have a test ROM
Replies: 31
Views: 36699

Re: Big RAM on FME-7: I have a test ROM

One game using the "5B" variant of this mapper (Gimmick!) adds an AY-3-8910 clone at $C000-$FFFF, with the address port nominally at $C000 and the data port at $E000. But then unlike Batman: Return of the Joker/Dynamite Batman, Gimmick! doesn't have RAM at $6000-$7FFF.
by tepples
Thu Jun 10, 2021 6:23 am
Forum: General Stuff
Topic: Living and Hacking in a Tent
Replies: 9
Views: 1631

Re: Living and Hacking in a Tent

My grandmother quit smoking when I was 9 years old to make sure she lived to see me graduate from college. It worked. Tapering works for some people. Find the time of day of your first cigarette on a usual day. On a calendar, write down that time for today, then for each following day over the next ...
by tepples
Wed Jun 09, 2021 6:17 am
Forum: General Stuff
Topic: Becoming an FPGA Engineer
Replies: 48
Views: 6191

Re: Becoming an FPGA Engineer

In Furrtek's decap and trace of the MMC3 (GitHub; previous discussion), M2 delay appears to be done by passing the signal through a bunch of buffer gates used for their gate delay. Your FPGA may or may not support a corresponding design idiom.
by tepples
Wed Jun 09, 2021 6:10 am
Forum: Other Retro Dev
Topic: NDS Wifi specs
Replies: 28
Views: 25879

Re: NDS Wifi specs

Reusing the GBA cart interface, including WAITCNT/EXMEMCNT, would make sense if Nintendo were originally developing the DS Wi-Fi radio as an Option Pak in SLOT-2 before putting it on the mainboard.
by tepples
Thu Jun 03, 2021 7:40 am
Forum: Newbie Help Center
Topic: Creating a text box
Replies: 31
Views: 2653

Re: Creating a text box

Think of ASL as meaning Add to SeLf.

Oh, and if you need help integrating my Popslide library, I'm available.
by tepples
Wed Jun 02, 2021 7:59 pm
Forum: Other Retro Dev
Topic: 3DS reverse engineering
Replies: 320
Views: 262712

Re: 3DS reverse engineering

I found the rationale underlying this "interlacing-like behavior" in Game Boy systems' displays (and other LCDs for that matter). From the README file of 144p Test Suite for Game Boy and 160p Test Suite for Game Boy Advance ( view on GitHub or download on NESdev ): To keep positive and negative volt...
by tepples
Sat May 29, 2021 5:40 am
Forum: NESdev
Topic: NES dev on retro pc
Replies: 20
Views: 2318

Re: NES dev on retro pc

This appears to be a crosspost from a thread on Reddit . You might find more answers there. Are you SaltInvestigator54? Practically, a Commodore 128 or a 128K Apple IIe or IIc is probably the smallest 6502-family machine for which I'd consider building a full-capability assembler as a proof of conce...
by tepples
Thu May 27, 2021 11:07 am
Forum: General Stuff
Topic: Art Display Games for NES?
Replies: 10
Views: 1617

Re: Art Display Games for NES?

Perhaps it's time for one of us to make something cursed, passing it off as a presentation builder app.
by tepples
Sun May 23, 2021 5:33 pm
Forum: NESdev
Topic: Nintendo's Advanced Video System
Replies: 11
Views: 11128

Re: Nintendo's Advanced Video System

There's a font floating around called Pretendo that aims to replicate the typeface in the Nintendo logo. Several glyphs in Pretendo look seriously off-model, especially the k in the name of the PocketNES emulator. Another replication called Nintender looks superior in several ways, though the contra...
by tepples
Wed May 19, 2021 4:44 pm
Forum: NESdev
Topic: In Search of 6502/Turbo Game Doctor 6M+ Hacking Expert.
Replies: 27
Views: 7912

Re: In Search of 6502/Turbo Game Doctor 6M+ Hacking Expert.

If I owned a Famicom and FDS on which to test, I'd probably have already made conversions of my own NES games.
by tepples
Wed May 19, 2021 4:01 pm
Forum: NESdev
Topic: A question about CPU address exposed to the cartridge
Replies: 14
Views: 6937

Re: A question about CPU address exposed to the cartridge

The difference between a 2A03's CPU core and an authentic 6502 is a lot less than the difference between the Game Boy's CPU core and a Zilog Z80. It's as if only the daa instruction were missing, not the entire DD (IX), ED, and FD (IY) prefixes. Apart from the lack of decimal mode, the 2A03 behaves ...