First post, by mathew7
Hello,
I just aquired a Pentium ISA-only SBC (markings: CI5TTL), which seems great for DOS retro, but it's integrated video always outputs 848x480 resolution (and it's problematic for my VGA to HDMI adapter when I use it with TinyPilolt IP KVM).
From the manuals I could find, the 6555x (Chips & Technologies) has 2 BIOSes available: 1 for LCD/TFT and 1 for CRT output. But I can't find them anywhere.
After many tries, I found that I could switch to CRT output by loading SDD/UniVBE and then running it again with "SW CRT" parameters. But I hate loading large drivers, especially since the BIOS provides VBE 2.0.
So what I'm looking for is either a CRT BIOS or how to make a small program to switch the chip into CRT-only output (on laptops, that would be done by it's BIOS Fn-keys).
Additional ISA VGA cards do work (and 6555x gets disabled). But I intend to use a 4-slot ISA backend for small footprint (thinking of SBP 2.0+PC-MIDI+network).
Have a nice day,
Mathew