I have installed a Trio64v+ into a Windows 95 machine. It works fine in DOS mode but for some reason when in Windows I am getting all kinds of multi colored lines on the screen. It happens at every resolution and refresh rate setting. I will post pics to show what I am dealing with in next post once I get to another computer. Does anyone know what may be causing this or a way to fix?
I would say bad vram... If the ICs are socketed try some other ones and see if things improve
Well I just took out the 2 vram chips and switched them. So still using same chips but in the opposite sockets and it is working fine now! Why would this be? Were they just not seated well to begin with maybe?
My Trio64v+ used to paint additive random blue pixels into the buffer in certain SS7 motherboards.
wrote:Well I just took out the 2 vram chips and switched them. So still using same chips but in the opposite sockets and it is working fine now! Why would this be? Were they just not seated well to begin with maybe?
It could mean that the ram in the first megabytes is faulty and now that moved it down the line - and it's not getting used - all is OK. So I would assume that you have 1 bad IC.
I don't think you are getting the same thing as leileilol since the ram order would make no difference in this case.
So yeah, just get a new pair of ICs and call it a day.
Thanks for the help! It is working still as of now but ill probably order some new IC's just to be safe.
Ok I have two VRAM chips on this board. They each have a number on top and it be below it. The top number is 9531. The bottom number is V53C16258HK50. There is some on eBay I could get but the top number is different and the bottom number is the same except for its 6HK50 at the end instead of 8HK50. Will these work as replacements and have the same amount of ram? I will provide the eBay link for what I am looking at.
https://m.ebay.com/itm/V53C16256HK50-MOSEL-DR … 3sAAOSwVlVaTR0T
the top number is the ICs datecode, 9531 means week 31 of 1995.
Be sure to get V53C16258HK50 ICs as they have better performance than the 256 variant
like this: https://www.ebay.com/itm/1-PER-LOT-INTEGRATED … OJ/152640183716 , it's faster but it will work fine
The 40 at the end means it is faster than the 50 then?
yep it means it's 40ns : lower number = faster for dram
Great! Thanks for the help. I’ve ordered 2 of them.
When searching for obsolete ics it's a good idea to also check UTSOURCE and Aliexpress, as sometimes it can be considerably cheaper than ebay.
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I did receive the chips and it does work better but occasionally when moving around a window lines will appear but not near as bad.
Also, I am curious how you go about determining memory capacity on these chips? The datasheet says they are 256k x 16. Wouldn't that mean 4mb? So why do I only have 2mb when two of them are installed?
256k x 16 are 512 Kbyte. The size is always given in bits.
More exactly explained: There are 262,144 cells with 16 bits each, resulting in 4,194,304 bits. Divided by 8 to convert bits to bytes you get 524,288 bytes, which are 512 KB.
In most cases, you don't even have to look for the datasheet. On a dram chip with 256k x 16, you'll most likely find the number "...16256" on it. Since these two values (16 and 256 in this case) are always a power of 2, they are easy to spot once you get used to it.
