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docs/hard/flickerfix.lha

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Short:Multiscan/DblPAL flickering h/w fix
Author:r_d_c at usa.net <Denis I. Sotchenko>
Uploader:r_d_c usa net <Denis I Sotchenko>
Type:docs/hard
Architecture:generic
Date:1997-09-30
Download:http://aminet.net/docs/hard/flickerfix.lha - View contents
Readme:http://aminet.net/docs/hard/flickerfix.readme
Downloads:1232
English

There  are  annoying  thing  on some new (ESCOM AG) AGA machines - strange
video  effects,  caused  by  a bug in video controller.  It are flickering
stripes,  what  appear  progressively  on  the 28mhz (PAL shres, Multiscan
hires)  screen  during  electricity warms the machine.  It appears only if
RGB   color   (24bit)   have  23-24bit  set  -  e.g.   RGB=255,255,255  or
RGB=255,255,127.  Most programs have palette preferences and colors can be
setting   in  any  values,  but  some  programs  (e.g.   picture  viewers,
ShapeShifter, etc.) haven't this option.

There  are  several software solutions - programs for correcting colors on
the  screens,  but  these  programs  trashes  palette  and  don't  work on
non-system stuff.  It is not very effectively...

Now we have very effective hardware solution.  Simply connect together two
pins of resistor E127R on A1200 board.

Big thanks to Alexander Bogdanow for info.


Russian

     Ìíîãèå  ïîêóïàòåëè  «íîâûõ»  1200òîê  (îò 
ESCOM  AG, à íûíå îò AMIGA Technologies)  ñòàëêèâàëèñü  ñ
íåïðèÿòíîé ïðîáëåìîé:  ïîÿâëåíèåì
ìåðöàþùèõ ïîëîñîê  ñïðàâà  îò  íàèáîëåå 
ÿðêèõ  öâåòîâ  íà  ýêðàíå â 28-ìåãàãåðöåâûõ
ðåæèìàõ  -  òàêèõ,  êàê  Multiscan  hires  èëè  PAL
superhires.  Ñóòü ýòîé ïðîáëåìû  â  äàííûé  ìîìåíò 
óæå  èçó÷åíà  -  ýòè  ïîëîñêè  íà  ñàìîì äåëå
ïðîÿâëÿþòñÿ  íå  íà íàèáîëåå ÿðêèõ öâåòàõ, à
íà öâåòàõ, â RGB ñîñòàâëÿþùèõ êîòîðûõ
ïðèñóòñòâóþò õîòÿ áû 23 áèòà.  Ýòî çíà÷èò, ÷òî
ýôôåêò ïðîÿâèòñÿ íå òîëüêî  ïðè  RGB=255,254,255, 
íî  è  íà  RGB=255,255,127.   Ñêîðåå âñåãî, ïðè÷èíà 
ýòîãî  â  òîì,  ÷òî  ïðè  áîëüøîì  êîëè÷åñòâå 
åäèíèö íà öèôðîâîé âèäåîøèíå  ïðîèñõîäèò 
ïåðåãðóçêà  ìèêðîñõåìû ïî ïèòàíèþ, èëè
÷òî-òî åù¸ â ýòîì æå äóõå.
     Ïðîñòåéøèé ñïîñîá ðåøåíèÿ ïðîáëåìû -
çàìêíóòü ðåçèñòîð E127R ñ íèæíåé ñòîðîíû 
ïëàòû  ìàøèíû  (ïðè  ýòîì  ïðèä¸òñÿ  ñíèìàòü 
ñ íå¸ ìåòàëëè÷åñêèé êîæóõ).  Íà ðèñóíêå â
àðõèâå óêàçàíî ïðèìåðíîå åãî ðàñïîëîæåíèå. 
Ïðè ýòîì ñîîòâåòñòâóþùèé  ñèãíàë  ïîäà¸òñÿ 
íà  âõîä ìèêðîñõåìû LISA ñ âûõîäà ALICE
íåïîñðåäñòâåííî, ìèíóÿ «àíòèçâîííûé»
ðåçèñòîð.  Íàçíà÷åíèå ýòîãî ðåçèñòîðà - 
ïðåäîòâðàùåíèå  ýôôåêòîâ,  îïèñàííûõ  âûøå. 
 äàííîì ñëó÷àå ïîëó÷èëîñü íàîáîðîò.   Êàê 
ìíå  êàæåòñÿ,  åñëè  áû  24 òî÷íî òàêèõ æå
ðåçèñòîðà áûëè óñòàíîâëåíû íà âèäåîøèíå,
ïðîáëåìû áû íå áûëî.
     Àëåêñàíäðó   Áîãäàíîâó   çà  
ïðåäîñòàâëåííóþ  èíôîðìàöèþ  âûðàæàåòñÿ
èñêðåííÿÿ áëàãîäàðíîñòü.


Contents of docs/hard/flickerfix.lha
PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic]                 1450    2382  60.9% -lh5- a86e Sep 29  1997 flickerfix.doc
[generic]                  315    3890   8.1% -lh5- 1bd3 Sep 29  1997 flickerfix.ilbm
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         2 files    1765    6272  28.1%            Sep 30  1997

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