First post, by Danger Manfred
Hello! I found this curious graphics card with the Cirrus Logic GD5428 chip on it, and 2x512k of 80ns VRAM.
But on the PCB, it says "GD542X", the FCC ID says "GD5426", and what's more, there is an actual instruction on how to upgrade the card printed on the PCB, too.
The 8 footprints can be populated with memory chips (although it doesn't say which) and the instruction also mentions that you can toggle between the soldered-on memory and the upgraded memory as "main" and "secondary" Megabyte of memory.
I have several questions to this:
1. Is this a GD5428 or GD5426 card now?!
2. Does this mean that the "main" and "secondary" MB can operate at different speeds from each other, so you would want to make the faster memory the "main" one?
3. If not, what reason would you have to make one the "main" memory over the other?
I made a photo of the card in question (on the bottom) with a regular GD5428 for comparison.
Please excuse the blurriness, I have shaky hands due to a physical disability, and for some reason it was especially bad today.