Back to home page

DOS ain't dead

Forum index page

Log in | Register

Search:  
Back to the forum
Board view  Mix view

Book8088's CF2IDE stumps Freedos boot (Users)

posted by bocke, 31.01.2024, 09:28

> The topic is the same as one I already linked before in one of my
> responses.
Seems there was an update later in topic:

Hello everyone, I have an update on the VGA 640x480 mode issue on the 8088 laptop. I contacted the seller and complained that the LCD controller was buggy. After several message exchanges on AliExpress, where I sent C code demonstrating that the LCD turned black every time VGA 640x480 mode was invoked, they sent me a replacement controller. Now it works! I was able to configure Windows 3.0 in VGA 640x480 mode, and other games like Dyna Blaster now run as well. The 640x480 mode with 256 colors is also functional. The peculiar thing is that these video modes start in a 4:3 aspect ratio. The other modes seem to remain as they were, but it appears that certain games have less faded colors than usual. The only small bug is that in text mode, it cuts off half of the last line without a solution to recenter by invoking "mode 80."

And:

I received a new LCD controller as well and I was able to dump the firmware from both boards and I can confirm that a simple firmware transplant seems sufficient to fix the original board.
Unfortunately it was necessary to desolder both EEPROMs otherwise the TL866 complained about overcurrent when just clipped to the chip while on the board.

The boards are identical except for a slight difference in the main controller chips, the original is RTD2660 C3F62G1 while the new one is RTD2660 D8C23G3, I don't think it's particularly relevant.

The EEPROM is a P25Q40SH (4Mbit SPI) in both boards and it's not directly listed at least in the old MiniPro software, I selected more or less randomly the BG25Q40A and disabled the ID check and everything worked

After the upgrade, the driver from VOGONS worked (at least somewhat):


I was able to run Windows 3.0a at 640x480 256 colors or even 800x600 256 colors using these drivers https://winworldpc.com/product/avga3-gd542x-display/1 and following the instructions in this readme https://web.archive.org/web/20150809205726/http://...ivers/legacy/vga/cirrus/cirrus1/#1/win30/readme

Initially it seemed to not support 640x480 256 but it run at 800x600 256 however after using clmode (also included in the driver package) and enabling High VGA Refresh Rate it seemed to have fixed itself even after powering it off and on again

Someone also posted a ROM dump.

The topic is same as before: https://forum.vcfed.org/index.php?threads/book-8088-discovery-and-modification-thread.1245155/

Post reply
 

Complete thread:

Back to the forum
Board view  Mix view
22049 Postings in 2034 Threads, 396 registered users, 74 users online (0 registered, 74 guests)
DOS ain't dead | Admin contact
RSS Feed
powered by my little forum