Reply 20 of 23, by darry
vacatedboat wrote on 2020-07-25, 08:02:Run windows stuff. Applications and games etc.
Had to resize image. Hopeits good enough
OK, your card has an integrated RAMDAC inside the TVGA9000i-2 chip .
The datasheet I found for the TVGA900i ( http://pdf.datasheetcatalog.com/datasheets/23 … 0/501949_DS.pdf ) indicates, on page 12 that 800x600 in 256 colors is supported in both interlaced and non interlaced modes .
AFAIK, the interlaced mode is a non standard (non VESA) mode that would likely work only on a CRT .
The non-interlaced mode has a total line length (active + sync+ front porch+ back porch) time that can be calculated by adding T6 and T7 (see diagram on page 11) , which gives 6.222+22.222=28.444 . This corresponds exactly with 800x600 at 56Hz (see http://tinyvga.com/vga-timing/800x600@56Hz ) and the front porch, back porch and sync times are practically identical too . 800x600 in 16 colours is possible at both 56Hz and 72Hz .
TLDR is that unless your LCD monitor supports either the weird 800x600 interlaced mode or 800x600 at 56Hz (you can check the manual), 800x600 in 256 colors is off the table with your video card .
EDIT: Sorry to say this, but the TVGA9000i was a pretty low-end chip with low end capabilities and bottom of the barrel performance (not absolutely the worse, Oak Technologies and Realtek apparently had worse offerings). Your 386 DX40 probably deserves better to deliver all that it can, performance-wise.