Hi
I have pretty Presario CDS 528 and sometimes games not work with 0,5mb.
This is not problem, you can add new VGA with 1mb . What you need :
- ISA VGA card 1mb or better
- vga cable
- 20 minutes, screwdriver, soldering iron (only for soldering needles on cable ends)

VGA cable is under floppy drive 3,5
Pinouts VGA cable from CDS computer and VGA cable in 99% is same.
pinouts
https://articles.triplewidemedia.com/choosing … ideo-cable-vga/

But when your cable have anther color, not problem. If you're not sure you can connect vga on power computer.
Nothing will be damaged if you do not close the wires. Even if the monitor signals are connected in the wrong order, they will not break either the monitor or the cga card.
The total cost upgrade was 5$. Working very well. The computer is still original and you can return to the previous configuration. Currently is 1mb vga , 64mb ram , 2gb CF. Works faster.

Does anyone know which pins to connect 4.5v batteries for RTC compaq CDS 528 ? I do not know where the positive pin is.

And does anyone know about a group of people creating an open source AMD 5x86 processor adapter like evergreen ? They have to provide documentation so that everyone can order the adapter themselves at a much lower price than on ebay.