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This is an issue with the z80 sub cpu or something related to it. Sonic1 works because it uses a sound driver than runs on the 68000 for the most part.
Though most games use the z80 for everything...

Eggcelent :P

They are both square waveforms.

This needs further testing. It may be expecting a pulse to align pixels (IE being used as a blank signal to reset the horizontal pixel counters or...

Yes it would

A recent talk with Tmee suggested that it was due to RAM refresh. What happens is that the ICs halt for a moment on that spot which causes the main voltage rail to rise (due to reduced power...

An half H killer is a circuit that removes the half lines (pulses with shorter duration, aka equalization pulses) from the sync pulse. The LM1881 does not do this.
RGB monitors may go crazy with...

This circuit kills FM stereo, IE left channel of YM2612 will be the same at the same voltage always as the right channel. Other problem is the DC bias which is not removed or set or anything between...

Looks like an half-H killer to me

Monitors have provisions to split the mixed sync signal to restore H and V and have polarity autodetection and whatnot. The 32X most likely expects the VSync to be present with the correct polarity....

Hi.

B26 [/ASEL] is asserted for any access in 0-0x7FFFFF range. This means that this signal is essentially B11 [VA23]. It may have a slight different timing like larger or smaller pulse width, but...

R35 for FM_L, R38 for FM_R. Both are 2.2kOhm There's also 2 caps in series with the FM outputs, if they get bad, you lose the sound coming from the FM chip starting with low frequencies (C41 / C43)....

The video signal going "Up and Down" is normal, it's AC coupled, so that when the picture goes white the sync pulses go further down so that the average amplitude is 0V. If you want to see the video...

Yes :P

Yes you can try 2x 50k ones set to the max and then turn down both until it you get happy with it. Actually there are double potentiometers that share the same shaft, those will keep your PSG...

Yes, you can play with resistors R34 and R37 on your VA6, they are both 51kOhm (one for each channel), replacing them for lower values like 47k, 39k.. etc, will make the PSG stronger..
Or maybe C40...

Playable knuckles use palette 0, the colors which are usually blue used by sonic are replaced by knucks reds in this case.. There is also a green in line 0, used by the robotnik monitor and some...

It could be possible that knuckles was pink back in the alpha/beta days? And then they just updated the colors to red on the title screen and when he is a playable character, and forgot these other...

Classic EU version, preordered it back then in summer 2008(?).. I have copy 377/800, payed 35 bucks. And still have it of course :D

You cant. Unless you disable the display partially/totally but in that case you don't need to transfer 35kB in a single frame :P

There is no keylogging, it's a mistake. The anti virus being tripped over is due to the code obfuscation. The game does take keyboard inputs when it's out of focus, but doing that isn't wrong.

Yeah LR are muxed, my mistake here.

Yes testing from pin1 to 8 would show if there is a short, but he didn't test it so yeah. Before saying the chip is busted, these external little things need to...

There could be a solder debris leftover from a mod or the EM21 going kaput.

Also, UDLR are direct.

A larger loop? Wat

So you say that if you short the port pin to ground, the IO chip will lose continuity to the port pin? that makes no sense because that's exactly what the controller does when a...

It's good, but still it's most likely shorted to ground, which he didn't measure

The short is not elsewhere on the board, I wanted to mean somewhere on the signal path from the chip terminal to the controller port pin, because I doubt the IO chip has the terminal dead unless he...

No, not definitively. There could be a tiny short elsewhere. Without board pictures it's impossible to rule out that posibility