Unknown holes in the motherboard of the CBM610

Hallo allemaal,


Among (too) many other hobby things I'm busy drawing the schematics and board layout of the 610 and 720 in Eagle. Looking at the 610 board I noticed that, beside the holes needed for the 8088 card, there are several other holes in that area. I have no idea what they are for and the save thing to do is to include them in the package of the board. But still: can anybody tell for what are these holes needed for?
(I haven't opened my 720 yet so I don't know if it has extra holes as well)

Comparing to previous projects I did, this a really big board. So I could use some advice. I reasoned that some connectors, like the cassette port, RS232 and 720-keyboard connector, have to be included in the package for the board because they need to be at a fixed position. The 610-keyboard and userport connector don't have to be placed at exactly the same spot as on the real board IMHO so I offer them as separate packages. But what about the big and small expansion connectors left and right of the DRAM? I don't know any other card then the 8088 card that uses these connectors and it uses flatcables to connect itself to the motherboard and therefore it doesn't need these connectors at a fixed place. (hmmm, just popped up: for the same reason it doesn't matter if the holes are moved a bit) So what to do with these connectors?

FYI: although the package of the board includes several connectors, the board and the connectors have their own symbol.


Met vriendelijke groet / With kind regards, Ruud Baltissen

www.Baltissen.org<http://www.baltissen.org/>



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