Search found 441 matches

by Cristian
Tue Feb 20, 2018 12:12 pm
Forum: General QL Chat
Topic: QL 2002 The DVD
Replies: 2
Views: 154

Re: QL 2002 The DVD

Thanks for your continuous support in the QL scene!
by Cristian
Sun Feb 18, 2018 2:12 pm
Forum: General QL Chat
Topic: QL 34th Anniversary new hardware.
Replies: 83
Views: 4472

Re: QL 34th Anniversary new hardware.

Drumroll.........
by Cristian
Sun Feb 18, 2018 2:01 pm
Forum: Hardware
Topic: New Membrane Malfunction
Replies: 25
Views: 3185

Re: New Membrane Malfunction

kordics wrote:That means the I have 2 operable machines. QL networking here I come…

:-)
by Cristian
Sat Feb 17, 2018 1:10 pm
Forum: Software & Programming
Topic: Graphic drawing Qemulator/QPC2
Replies: 10
Views: 391

Re: Graphic drawing Qemulator/QPC2

For what I can see here, all the QPC window is stretched. So it's normal it's also stretched all the graphics inside.
The original modes (8 and 4) have been set to draw round circles on a 4:3 display (rectangular pixels).
This QPC window instead seems to display square pixels.
by Cristian
Sat Feb 17, 2018 8:46 am
Forum: Hardware
Topic: All RAM chips destroyed??
Replies: 56
Views: 2774

Re: All RAM chips destroyed??

Yes I confirm that the mods (resistors, wiring) on 8302 have never been done at all. Surely I'm going to apply the mods as soon as possible, anyway I suppose they should not affect the startup process.
Thank you again for your teachings and suggestions. Now I feel so near the truth...
by Cristian
Fri Feb 16, 2018 6:22 pm
Forum: Hardware
Topic: All RAM chips destroyed??
Replies: 56
Views: 2774

Re: All RAM chips destroyed??

Here below is a summary of the repair progress till now. A possible next step might be the modification on 8302 (adding R102 and R103).

Image
by Cristian
Fri Feb 16, 2018 6:18 pm
Forum: Hardware
Topic: All RAM chips destroyed??
Replies: 56
Views: 2774

Re: All RAM chips destroyed??

Dave wrote: one path through may be pulling up or pulling down
Not sure to understand... sorry for my english

Dave wrote:Look up the binary of the ASCII character to work out which bits are toggling.
I'm afraid this is too much for my limited knowledge. Anyway, thank you very much for your suggestions and efforts.
by Cristian
Thu Feb 15, 2018 7:58 pm
Forum: Hardware
Topic: All RAM chips destroyed??
Replies: 56
Views: 2774

Re: All RAM chips destroyed??

are the pixel noise patterns fixed (thus stored in RAM) or shimmery (thus happening after RAM)? The pixel noise is not fixed, it quivers continuously and randomly. I have strong suspicions about 8302, because: - it had the dirtiest pins (now cleaned as much as I could); - it's one of the few chips ...
by Cristian
Thu Feb 15, 2018 12:30 pm
Forum: Hardware
Topic: All RAM chips destroyed??
Replies: 56
Views: 2774

Re: All RAM chips destroyed??

Yes I agree 100% with Pr0f. The "snow effect" is real and generated by the QL itself. It usually starts some seconds after the appearance of Minerva logo, and tends to increase. But sometimes it does not appear. Since the RAM test succeeds, I suppose the Ram contacts should be OK; so I'll ...
by Cristian
Thu Feb 15, 2018 10:13 am
Forum: Hardware
Topic: All RAM chips destroyed??
Replies: 56
Views: 2774

Re: All RAM chips destroyed??

Looking forward to hearing whether this finally solves the issue! I've won the RAM battle! Now I have to win the war... After replacing 5 RAM chips, finally the initial RAM test runs without error codes: after the normal stipple screen, the Minerva logo appears. Then all becomes slow : after severa...

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