Search found 22175 matches

by tepples
Sat Apr 17, 2021 9:42 am
Forum: NESemdev
Topic: Open bus test results?
Replies: 5
Views: 383

Re: Open bus test results?

If the instruction was an indexed read from $3Fxx, then the last thing on the data bus was the PPU. Reading a write-only register, in this case $3F16 (a mirror of $2006), connects the PPU I/O data bus to the CPU data bus. The PPU I/O data bus holds the last value read from or written to a PPU regist...
by tepples
Sat Apr 17, 2021 5:04 am
Forum: NESemdev
Topic: How to put gba Games into a Pocketnes menu
Replies: 7
Views: 523

Re: How to put gba Games into a Pocketnes menu

After GBA Jam 2021 is over, an entrant might want to put out a cartridge with their entry and their previous NESdev Compo entries.
by tepples
Fri Apr 16, 2021 7:16 pm
Forum: Other Retro Dev
Topic: Reformatting GBATEK html version
Replies: 11
Views: 9960

Re: Reformatting GBATEK html version

Try dragging the web browser's titlebar to the right side of the screen. On my PC, this causes the browser window to shrink to half the screen's width ("Snap"), revealing the source code editor in the other half. It improves readability to limit text width to 80 columns. Otherwise, the reader ends u...
by tepples
Fri Apr 16, 2021 8:10 am
Forum: SNESdev
Topic: Mesen-S - SNES Emulator
Replies: 385
Views: 241154

Re: Mesen-S - SNES Emulator

As Wikipedia's policy on linking to infringing copies explains, courts have found contributory infringement in hyperlinks. See Intellectual Reserve v. Utah Lighthouse Ministry (US, 2000) and GS Media v Sanoma (EU, 2016).
by tepples
Thu Apr 15, 2021 12:03 pm
Forum: NESemdev
Topic: How to put gba Games into a Pocketnes menu
Replies: 7
Views: 523

Re: How to put gba Games into a Pocketnes menu

Cartridge opened at 6:05. My first guess is that under the epoxy blob, there's some mapper circuit to choose one of four GBA ROMs, with the first being the menu.
by tepples
Wed Apr 14, 2021 10:53 am
Forum: NESemdev
Topic: Testing emulator with nestest - i don't understand part of logs
Replies: 6
Views: 421

Re: Testing emulator with nestest - i don't understand part of logs

When instruction PLP is executed: Bit 7 is sent to the N flag Bit 6 is sent to the V flag The CPU disregards bit 5 The CPU disregards bit 4 Bit 3 is sent to the D flag (which the ADC and SBC instructions ignore but which can still be set to 1 or 0) Bit 2 is sent to the I flag Bit 1 is sent to the Z ...
by tepples
Wed Apr 14, 2021 6:35 am
Forum: NESemdev
Topic: Testing emulator with nestest - i don't understand part of logs
Replies: 6
Views: 421

Re: Testing emulator with nestest - i don't understand part of logs

Bit 5 (place value $20) and 4 (place value $10) do not exist in CPU register P (status flags). Their value is calculated when the flags are pushed through PHP, BRK, or an interrupt. For the sake of convention, logs from Nintendulator show P with bit 5 set to 1 and bit 4 clear to 0. See also "Status ...
by tepples
Mon Apr 12, 2021 7:14 am
Forum: SNESdev
Topic: About audio in rom bandwidth capabilities, and a external cpu...
Replies: 12
Views: 719

Re: About audio in rom bandwidth capabilities, and a external cpu...

Furthermore the S-CPU can actually transfer data to the SPC700 whenever it wants, frame timing or blanking periods have no relevance here. (Because the interface between the S-CPU and the SPC700 is *very* basic, the tricky part is performing these transfers in an efficient way, especially in the ba...
by tepples
Thu Apr 08, 2021 9:34 am
Forum: SNESdev
Topic: SNES oscilloscope readings?
Replies: 30
Views: 1641

Re: SNES oscilloscope readings?

It might mean that making Visual 5A22 won't be feasible until the layers below metal are exposed and photographed.
by tepples
Tue Apr 06, 2021 11:22 am
Forum: GBDev
Topic: Shitty 2.5D - PoC
Replies: 10
Views: 4538

Re: Shitty 2.5D - PoC

SameBoy indeed passes more behavior tests and has finer-scale emulation of the APU than bgb. However, the debugging tools in SameBoy for Windows and Linux are not quite as detailed as those of bgb.
by tepples
Mon Apr 05, 2021 11:27 am
Forum: SNESdev
Topic: SNES Music Pack 1 by Resistance
Replies: 9
Views: 879

Re: SNES Music Pack 1 by Resistance

Unlike the exact rational PAR of NTSC, the exact PAR of 50 Hz PAL involves some fairly big prime numbers such as 64489. This gives the fraction 2950000:2128137 ≈ 1.3862, and the unwieldiness of this is why I waited so long before establishing a 50 Hz counterpart to my long-running list of dot clock ...
by tepples
Sat Apr 03, 2021 6:23 am
Forum: NES Hardware and Flash Equipment
Topic: [FIXED] Nametable issue
Replies: 9
Views: 725

Re: Help! Nametable issue

Have you enabled NMI? If so, what does your NMI handler look like?
by tepples
Fri Apr 02, 2021 8:25 pm
Forum: NES Hardware and Flash Equipment
Topic: Famicom Network System (aka Famicom Modem) Investigations
Replies: 154
Views: 95784

Re: Famicom Network System (aka Famicom Modem) Investigations

Joe wrote:
Fri Apr 02, 2021 8:06 pm
Ben Boldt wrote:
Fri Apr 02, 2021 4:49 pm
Would you mind editing the wiki with your findings?
I would like to, but I can't figure out how to get access to edit pages.
Identity of "Joe" has been confirmed. Try editing now.
by tepples
Fri Apr 02, 2021 7:58 pm
Forum: phpBB Issues
Topic: Achievement unlocked: human spammers
Replies: 8
Views: 1382

Re: Achievement unlocked: human spammers

Like a Reddit shadowban? I see two issues with that. Policy-wise: I seem to remember complaints about Reddit's lack of transparency with respect to helping good faith users who got off to a rough start (or who happen to live in a bad global neighborhood) get out of shadowban jail. Technically: As us...