A2K Black Screen - Page 3

Pietro.tiberi · 14 December 2019, 22:48

I’ll keep you posted.

Provo il monitor 1084s e ti dico...

Inviato dal mio iPhone utilizzando Tapatalk

Toni Wilen · 15 December 2019, 09:14

There is no black or white error color. First color at power up (before dark grey) is basically random, usually black or white (Denise revision can also make a difference). It is strange to blame the CPU when almost any failed chip or pin/connection can make the hardware appear totally dead.

Do you have a floppy drive? Does it start clicking? Does floppy drive led or motor start when screen turns white? Did you wait at least 1 minute? There is long delay if DF0: can't be found. (or related circuitry is broken)

Did you swap CIAs?

Check also 3 IPL lines between CPU and Paula. Missing (or stuck) interrupts makes the system appear hung after most other initializations have been done.

solarmon · 15 December 2019, 09:18

Sounds like an issue with the interrupt signals, that Paula manages.

Check the IPL and INT signals on Paula.

Pietro.tiberi · 28 December 2019, 15:35

Can you tell what to check? what value is expected for INT signal?

I connected also a monitor via RGB 23 pin connector and I can't the same output as via s-video. on Rgb i can see some glitches an for a while a lightblue screen....while on s-video I can see DarkGrey-LightGrey and White sequence.
Any suggestion?

Inviato dal mio Redmi Note 7 utilizzando Tapatalk

Pietro.tiberi · 01 January 2020, 19:33

Hi, anyone can help? I'm a bit lost...;(

solarmon · 01 January 2020, 20:47

Check that the traces for these IPL and INT signals have continuity to/between where they should be - as per the schematics - and that there is activity on them.

Pietro.tiberi · 22 March 2021, 18:50

IPL an INT traces are fine (continuity check OK)....any other Hint?

Pietro.tiberi · 22 March 2021, 18:52

I also have a DiagROM. Using S-video connection to monitor I can see some caracters...and and some lines moving fast. The text is not legible because it is coverd by the moving lines...

Can you help me in using hte diagROM? maybe I need a serial connection to a PC...

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14 December 2019, 22:48	#41
Pietro.tiberi Registered User Join Date: Oct 2017 Location: Marino Posts: 42	I’ll keep you posted. Provo il monitor 1084s e ti dico... Inviato dal mio iPhone utilizzando Tapatalk

15 December 2019, 09:14	#42
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,553	There is no black or white error color. First color at power up (before dark grey) is basically random, usually black or white (Denise revision can also make a difference). It is strange to blame the CPU when almost any failed chip or pin/connection can make the hardware appear totally dead. Do you have a floppy drive? Does it start clicking? Does floppy drive led or motor start when screen turns white? Did you wait at least 1 minute? There is long delay if DF0: can't be found. (or related circuitry is broken) Did you swap CIAs? Check also 3 IPL lines between CPU and Paula. Missing (or stuck) interrupts makes the system appear hung after most other initializations have been done.

15 December 2019, 09:18	#43
solarmon Registered User Join Date: Dec 2018 Location: UK Posts: 1,716	Sounds like an issue with the interrupt signals, that Paula manages. Check the IPL and INT signals on Paula.

28 December 2019, 15:35	#44
Pietro.tiberi Registered User Join Date: Oct 2017 Location: Marino Posts: 42	Can you tell what to check? what value is expected for INT signal? I connected also a monitor via RGB 23 pin connector and I can't the same output as via s-video. on Rgb i can see some glitches an for a while a lightblue screen....while on s-video I can see DarkGrey-LightGrey and White sequence. Any suggestion? Inviato dal mio Redmi Note 7 utilizzando Tapatalk

01 January 2020, 19:33	#45
Pietro.tiberi Registered User Join Date: Oct 2017 Location: Marino Posts: 42	Hi, anyone can help? I'm a bit lost...;(

01 January 2020, 20:47	#46
solarmon Registered User Join Date: Dec 2018 Location: UK Posts: 1,716	Check that the traces for these IPL and INT signals have continuity to/between where they should be - as per the schematics - and that there is activity on them.

22 March 2021, 18:50	#47
Pietro.tiberi Registered User Join Date: Oct 2017 Location: Marino Posts: 42	IPL an INT traces are fine (continuity check OK)....any other Hint?

22 March 2021, 18:52	#48
Pietro.tiberi Registered User Join Date: Oct 2017 Location: Marino Posts: 42	I also have a DiagROM. Using S-video connection to monitor I can see some caracters...and and some lines moving fast. The text is not legible because it is coverd by the moving lines... Can you help me in using hte diagROM? maybe I need a serial connection to a PC...

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