Unknown Mega ST blitter ?

[exxos]

This one just sparked my interest because I just happened to see this post on Facebook..

Some others notice that the CPU is soldered down and a lot of chips are now in sockets which they are not ordinarily.. I notice there is no blitter patch..

The guy said "the box has blitter upgraded sticker on it"

I asked for a closeup above the blitter, not sure I recognised the brand ? But a little odd as it is actually stamped 1987. When normally they are like 8908. Normally ST / National brands IIRC in general. Maybe IMP not sure ?

540457162_1391760478556673_1159853971688456112_n.jpg (174.35 KiB) Viewed 1905 times

539951182_1388616228871098_7804490865689584823_n.jpg (429.68 KiB) Viewed 1905 times

546811955_1400805277652193_6610096446214903555_n.jpg (74.43 KiB) Viewed 1905 times

Just thought it was slightly interesting enough to document it..

[alexh]

That part number is discussed a few times on an ijor thread over on Atari-forum

That's the Signetics/Thompson logo

[exxos]

That's the Signetics/Thompson logo

Cool thanks. Honestly can't remember seeing it before or not anymore.

[czietz]

Sorry to nitpick, but there never has been such a thing as "Signetics Thompson". STMicroelectronics used to be SGS-Thomson.

The logo is actually the one of "IST", a subsidiary of SGS. Apparently, that subsidiary was not too successful, because shortly afterwards the Blitters were made with the "ST" logo of the newly merged parent company.

ist.png (50.64 KiB) Viewed 1863 times

[DoG]

I know it looked familiar. I reponded to that thread as well on FB. Every chip in a socket... highly unusual.