The switched duty bug on clones - an evidence

[MottZilla]

I don't know but most modern clones I've seen and the ones I've had all had switched duty cycles. I would guess earlier clones didn't. I've heard the Tristar clone had good sound.

[mikejmoffitt]

I can confirm from a unit I received recently that the Generation NEX Messiah has the swapped cycle bits, as does the Super Joy 3.

[Eugene.S]

puNES 0.69 will be support "swap duty cycles" bug (25% <-> 50%)

[l_oliveira]

Only clone CPUs made by UMC have the duty cycle bug. But it happens to be the UMC was the most common ones.

There are clones which have issues with the DPCM, too. Some have no duty cycle bug and bad DPCM. Others have perfect DPCM but do have the duty cycle inverted.

Oh well...

[HardWareMan]

Yesterday I've spent some time to test a batch of TA-03NP (datecode 9228). All of them works fine. No duty swap neither DPCM bug. I'm very happy.

[Eugene.S]

small correction: TA-03NP1, not TA-03NP.

[l_oliveira]

I have a TA-03NP chip and it's HORRIBLE. It has the worst DPCM on all clone chips I have. Also, it runs VERY HOT.
But it's the only clone chip I have that has correct duty cycle.

Not that I dislike the sound on swapped duty cycle chips, the DPCM problem annoys me a lot more. SMB3 sound is horrible on that TA-03NP chip.
Glad to hear that the PAL chip is better. Perhaps it's a newer version of the TA-03 chip?

By the way, I am almost sure that the TA-xxx chips are from some South Korea company.

[Eugene.S]

Yesterday record (on Famiclone PCB), just listen:
http://www.fileden.com/files/2012/4/10/ ... 03NP1.flac

[HardWareMan]

By the way, I am almost sure that the TA-xxx chips are from some South Korea company.

Information for consideration: TA-01 was seen in clone Atari 2600, TA-02 & TA-03 in clone NES, a set of TA-04/TA-05/TA-06/TA-07 in clone Sega MegaDrive. :3

[TmEE]

My TA-03NP1 also has 9228 date code, and apart from PAL games having wrong DPCM pitches, everything NTSC plays great on it !

[Eugene.S]

PAL games having wrong DPCM pitches, everything NTSC plays great on it !

This is correct behavior.

[TmEE]

Yes I am aware of that. At first I thought the CPU was faulty bun later I got a real NTSC CPU and it caused same behaviour so I knew I got gold there