hyuma

I have 5.4v on one side of R137... I never measured yet R160 Inviato dal mio CLT-L09 utilizzando Tapatalk

Voltage is about 5.45v. And no, I don't have nothing plugged on expansion module Inviato dal mio CLT-L09 utilizzando Tapatalk

Q20: Base: 11.17v Emitter: 11.93v Collector 11.90v Q23: Base: 4.24v Emitter: 3.50v Collector: 7.86v Inviato dal mio CLT-L09 utilizzando Tapatalk

I haven't nothing similar on that pins and also I replaced the oscillator with the same model and the situation didn't changed at all.. I tested 3 different new oscillator and still don't know why I haven't the 4.3mhz wave.. Inviato dal mio CLT-L09 utilizzando Tapatalk

After 2 days of tinkering I start pointing finger to the area of the board near the Lm1889n because now I replaced ram sockets and the image appears and disappear like a scrambled TV... And also image is black/white. I just noticed that oscillator Y3 doesn't show me any freq on any of his pin, and I'm not sure if Lm1889n could be ok... Inviato dal mio CLT-L09 utilizzando Tapatalk

TMS416415NL, but I'm 100% sure that ram are good because I have tested with arduino Inviato dal mio CLT-L09 utilizzando Tapatalk

Ok so, the 2s and 14s pin have all continuity with VDP with no problem, also VDP have good continuity with Z80 too and voltages on RAM +5v pin8 is present, pin 1 have 0v and pin9 around +5v too Inviato dal mio CLT-L09 utilizzando Tapatalk

Ohhhh ok, gotcha! Inviato dal mio CLT-L09 utilizzando Tapatalk

DRAM 2 14 U10 pin 7 vdp 29 U11 pin 3 vdp 25 U12 pin 8 vdp 30 U13 pin 4 vdp 26 U14 pin 9 vdp 31 U15 pin 5 vdp 27 U16 pin 10 vdp 32 U17 pin 6 vdp 28 Like this? Inviato dal mio CLT-L09 utilizzando Tapatalk

What's the scheme means? And yes z80, bios, Sram and vdp have good continuity between them, I checked all combinations possible Inviato dal mio CLT-L09 utilizzando Tapatalk

Continuity between z80, Sram and BIOS is perfect, then I checked the continuity between vdp and DRAM by following the scheme in picture is good too.. Inviato dal mio CLT-L09 utilizzando Tapatalk

When I was reading with logic analyzer I always put the probe on the data lines of Z80, I never used the data lines of BIOS.. Today i got new VDP but the old one is ok, there is the same issue with new one. The DRAM are 8 4164 but I tested with arduino code and they are good.. I have to check traces but they seems cleaned and ok.. Also this is where I get info for the mod https://gamesx.com/wiki/doku.php?id=av:cbs_coleco Inviato dal mio CLT-L09 utilizzando Tapatalk

HOUSTON, WE GOT SOMETHING!! http://imgur.com/a/ldTDWMd http://imgur.com/a/J2DzH3G I found a little broken trace between Sram and BIOS and this is the situation now! OMG THERE IS LIFE!! I tested all DRAM and they're ok, I'm using this composite mod I made...[mention=66741]ChildOfCv[/mention] Inviato dal mio CLT-L09 utilizzando Tapatalk

What I have to do? Sorry I didn't understood Inviato dal mio CLT-L09 utilizzando Tapatalk

Socket are clean, like I cleaned also pins of ICs with IPA and deoxit... This is sampling wihtout VDP, reset is channel 8: https://ufile.io/kbgmeph6

hey @ChildOfCv as I'm really, really stubborn, I made another sampling (the 11th!!!!) and now i made some changes on logic analyzer and now i'm not using the "auto restart sampling" function. In this sampling reset line is channel 8 (pin 26) and pin 15 of U5 is channel 9. https://ufile.io/lijg6tcw Check now the reset only happens at 0.5746397. Tell me what you think now

It doesn't have the look a fake one: Inviato dal mio CLT-L09 utilizzando Tapatalk

I tested the clock with oscilloscope and it's says around 3.58-3.6mhz. I also bought the Z80 from local shop and it doesn't seems fake because i cleaned with IPA to test if label was painted...

@ChildOfCv At 9th attempt, by changing the setting to 50Msa on the logic analyzer i manage to have a sampling with change state of reset line: https://ufile.io/kx0lb3sw

I have to change some settings on the logic analyzer and try to resample? Inviato dal mio CLT-L09 utilizzando Tapatalk

ok @ChildOfCv Here the sampling: channel 0 = pin 14 channel 1 = pin 15 channel 2 = pin 12 channel 3 = pin 8 channel 4 = pin 7 channel 5 = pin 9 channel 6 = pin 10 channel 7 = pin 13 channel 8 = pin 15 (U5) channel 9 = pin 26 (U1) https://ufile.io/u72hem52 I have used 5V TTL. I noticed on logic anaylzer software that reset line change state from hi to lo when i press reset.. but watching the csv files, seems like the line is always hi, there is always "1"...

Yes I've done like that but i think no changing... I made 3 other sampling tests, but i think is the same: https://ufile.io/e66fd900

yes keep pushed reset then sampling.. but just for sure i made another sampling: https://ufile.io/zg96x3b5

Nope, pin 1,2,3,4,5,6 and 15 as you said Inviato dal mio CLT-L09 utilizzando Tapatalk

Ok, done, here is the link: https://ufile.io/en111f96 edit, I updated the link because i made a mistake!