First post, by audiocrush
Hi there!
today I found what appears to be a NuBus graphics card.
Maybe for a Apple Macintosh II?
I have no older macs than G3, so I have no clue what it could be.
It is made by Sigma Designs in 1989
It bears no apparent model number other than CMA-M2-0024.
There is nothing written on the back, and in the front there is 6 big QFP chips.
3 of them are the same IDT75C458 !!triple!! 8-Bit palette dac (which is weird because I assume you only need one of these for RGB)
and 3 others seem to be custom Sigma Designs silicon labelled 53C328 which is impossible to find.
Very grateful for any info on that thing!
It is unfindable to me 😁
Cheers
audiocrush
*edit*:
There is vy the way a whopping 24* MT 42c4255z RAM chips on there.
The datasheet suggests that it is 256Kx4Bit fast page memory
That would equate to a whopping 3 MegaBytes Ö_Ö can this be true?
That would be quite high end for a graphics card in 1989
https://www.nerdsh.org/ - my blog, a bit neglected though
https://www.youtube.com/channel/UChsU6woi3lhLhtT_ILbSCCw - Some videos of mine