Hi again,
I published useful information about this modchip on my web page. I hope it will be of help to someone else trying to modchip with ATtiny85.

Hello,
so I received my new CD drive, replaced it, and no dice.
After a few experiments, I happened to comment out the line with if (hysteresis >= 14) causing it to spam the SCEx messages over and over. And guess what - it worked :D
To sum up - it's a standalone Attiny85V @ 16 MHz (PLL clock) with ...

I tried it with the 16 MHz clock, no success. Then I tried with 5V Vcc, no success.
Then I removed the attiny and used atmega328 with 16mhz crystal (which should be the same setup as arduino uno). In code I uncommented the define for ARDUINO_BOARD and compiled the .ino file for board "Arduino ...

Yeah, those are the fuse settings I also used. The CKDIV fuse is unprogrammed meaning that frequency is not divided by 8.
Btw. the github page says:
ATtiny45: LFUSE 0xE2 HFUSE 0xDF > internal oscillator, full 8Mhz speed (supported, tested)
and ATtiny85 should work also - after all, it's just a ...

OK, I disabled debug output, but still no change. As you stated, the attiny is too slow - I thought it was already tested by someone else and working?
Anyway, I also have atmegas here, would for example atmega8 be better? I could also give it external crystal to be exactly at 8 MHz... or 16 MHz.
And ...

I only uncommented the define for ATTINY_X5. Will try disabling debugging, thanks.

//edit: btw. Atmel Studio programming tool allows me to calibrate internal oscillator I wonder if tinkering with that would help?

I got the debug pin working! :D
The problem was that I used "Arduino Uno" as board when I compiled the .ino file and so the resulting .hex file was not valid for my attiny. I followed a tutorial to set up arduino ide for a standalone attiny and then I was able to compile and export the correct .hex ...

Yes, baud rate of the port was set to 115200.
Today I started with repairing the CD drive. I managed to level it up and it now reads audio CDs without problems, even in upright position. Cool, I thought.
But it's worse with the game CD-R. The first few times, it didn't load the game and ended up ...

I measured the 3.5V by placing the DMM leads on Vcc and GND pins of the attiny.
Thanks for approving my pinout and soldering places :D
Meantime, I found out that the CD I burned yesterday, was full of errors so I bought a cake of new CD-Rs today (made by sony, incidentally :D ) to test with. I made ...

I hoped someone would answer. But since nobody did, I digged into it further. I found out that the pins numbered from zero do not mean pin number on the chip, but PBx port. Like this:
PB port / pin / meaning
PB0 5 SQCK
PB1 6 SUBQ
PB2 7 DATA
PB4 3 GATE_WFCK
- 8 Vcc
- 4 GND
I downloaded arduino ide ...

Hello,
I have an old PS 1 here. It's a SCPH-1002 PAL version. Board is PU-8. I was looking at the pictures of boards that are in the zip file on github. There are 2 pictures of PU-8 board but mine looks different! :o
This forum has ridiculous limitations for attachment pictures. When I downsized ...