Attiny85

[gtchandra]

Hi, thanks for the great page, the project is awesome, I tried today to mod my father PS1 with an ATTINY85 and did not work.
I initially set the clockspeed at 8Mhz internal clock (burning the bootloader) then I programmed the chip using my programmer and an arduino board with ISP.
I also tried to get some debug details, connecting on pin3 @115200 and it seems working, injection is called sometimes, but I had no luck in making a burnt CD working (already tried on other modded boards). It seems injection is not effective.
Any advice?
thanks

[kalymos]

From memory, the stability of the ATTINY85 clock and problematic. The best solution is to use an arduino pro mini.

Or the https://github.com/kalymos/PsNee/blob/AttyNee/PsNee.ino branch, and built for ATTINY.

For more explanation the forum http://www.psxdev.net/forum/viewtopic.php?f=47&t=1262&start=480 is the best place.

happy New Year.

[gtchandra]

Thank you! and happy New Year to you!!

[kalymos]

I understand why you can not find, the indication is in the code. unsigned char biosA18 = 11; //Only used in SCPH-102 PAL mode unsigned char biosD2 = 12; //Only used in SCPH-102 PAL mode Thank you for the question, I just added the warning in the table. Le mar. 1 janv. 2019 à 14:41, Gabriele Tazzari <notifications@github.com> a écrit :

…

I'm trying to change code to http://www.psxdev.net/forum/viewtopic.php?f=47&t=1262&start=480 but I can't find all the necessary board endpoint. I was able to find LID, GATE and Reset using this diagram. http://modchip.aeug.org/install/508-pu18-stealth.html but still cant find // - PB3 = biosA18 // - PB4 = biosD2 on the PU-18 Board... — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#15 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEblBOjNBFpKOmD7AZt92sUy3EPV6-qpks5u-2WAgaJpZM4ZltbI> .

[gtchandra]

Kalymos thank you so much for your support. I realised the wires were not used in my case, since I have a PU-18.
Anyway I switched all the project to the ATMEGA328P@8Mhz since I knew it was tested.
But I still can't make it work. Here's a short video of what happens.
https://youtu.be/xi_hyOTYIg8
It starts, injects and after a while enter in a loop where the optical track do not proceed. After few calibrations to the hysteresis that's the furthest I could get...
I also thought there's a problem with my laser drive but I tested an audio CD in different areas of the disc and all went pretty smoothly. Also I tried the same burnt CD with MGS disc1 on another PS1 with the 12c508 I installed 20 yrs ago and worked perfectly.
Any clue?

[ramapcsx2]

The chip works just fine, but your laser/drive/electronics have lots of trouble reading the disk.
Note: Once you see the black PS screen with a burned copy, you know that a modchip is working ;)

[gtchandra]

that's what I thought, I have to clean and repair the optical drive.
Thanks, I'll let you know and eventually switch back to attiny85 (which worked as well up to that point) so we can put a TESTED on the SCPH5502.

[gtchandra]

Hi there, just a quick one to update on the issue here.
The PSX I was working SCPH5502 on had serious issues related to the CD DSP. I tried on a SCPH 7502 (PU-22) with an ATTINY85 and it works perfectly.
Thanks for your support.