C103253 REV.5 - STFM

[rubber_jonnie]

And here's the C103253 REV.5 that just arrived. It's been a good day!

IMG_20180105_130550__01.jpg (5.87 MiB) Viewed 6297 times

Interesting board, as odd RAM chips. This board did come with a SIMM adaptor that sits atop the MMU and has a shifter adaptor, but I've removed that for the purposes of the picture. You can see a jumper on there for the adaptor, I left this on so I know where it goes, and it isn't getting in the way.

I will attempt to get running with no other HW fitted before I try to use the Adaptor.

DMA is a -38 and FDC is a VL1772.

EDIT 06/01/2018. The board runs after removing the RAM add in and re-soldering the resistor that had been 'jumped' elsewhere.

[Maeke]

indeed the stfm is an interesting board.
As for the ste only the post 91 ones had an ajax from factory, yours is too old (89-90).
Looking back, not far, it's a really early 91 (sixth week) before the revision when the blitter was integrated in another ic.

[avtandil]

And what is this, part number ?

part.jpg (4.13 KiB) Viewed 125 times

[rubber_jonnie]

And what is this, part number ?

part.jpg

Honestly, no idea.