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From: lyndsay <lyndsay@vivaldi.net>
To: 9front@9front.org
Subject: Re: [9front] trident cyber 9525 graphics glitches
Date: Mon, 20 Sep 2021 22:11:01 -0600	[thread overview]
Message-ID: <04dddd48-aaea-7d48-66d8-ffb6ae74520f@vivaldi.net> (raw)
In-Reply-To: <B79A0DBF404ADDC6923F2F0C56C2FC18@wopr.sciops.net>

i have been trying to work further on this tc 9525 issue but i've run 
into a couple stumbling blocks. i got the book by richard ferraro 
recommended in vgadb(6) in order to figure out what i'm doing and while 
i do intend to read at least the relevant parts, it is 1600 pages long 
so i'm moving slowly. it also is slightly too old and only addresses 
trident cyber editions up to 9430, which makes it hard to figure out 
ironclad specifics for the 9525 (especially because according to 
ferraro, the memory addressing especially differs significantly between 
versions, so i cannot trust the information there to necessarily be 
applicable to the 9525). could still maybe infer how it operates from 
looking at the 3,000(!) lines of bloated terrible xorg code for this 
driver alone but frankly, i would rather read the entire 1600 pages and 
spend weeks reverse engineering the card all while lying on hot coals 
than do that.

anyway i had the thought that i should test the graphics with a specific 
monitor entry in vgadb before trying to slog through the book, because i 
didn't try that before, only added the did. (correct me if this 
definitely will not do anything to help; i'm still new to how this all 
works.) i found an xserver configuration for the same card on a toshiba 
laptop with the same resolution (not the exact same laptop though), so 
i'm thinking it might work as a base - 
https://www.sanpei.org/Laptop-X/Laptop-X/Toshiba_Satellite_4070CDT. 
unfortunately the vgadb man page does not actually explain how to write 
a monitor entry, since 6 key fields can, according to it, only be 
explained by that book. i cannot find an explanation for those from the 
skimming i've done and they don't seem self-explanatory, looking through 
vgadb. anyone on this list happen to know where it explains 
shb/ehb/ht/vrs/vre/vt in the book? or if you don't but you can explain 
it that's great too.

also, qwx, did my original vgadb patch go through ok or did it get lost? 
i can try to send it again in the git format if you want.

thanks !

lyndsay

  parent reply	other threads:[~2021-09-21  4:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-05 17:30 lyndsay lastname
2021-09-05 22:52 ` qwx
2021-09-05 23:18   ` lyndsay
2021-09-06  0:08     ` qwx
2021-09-06  0:53       ` lyndsay
2021-09-06 21:29         ` qwx
2021-09-21  4:11       ` lyndsay [this message]
2021-09-21  5:06         ` unobe
2021-09-21  9:17         ` qwx
2021-09-21 14:45           ` lyndsay

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