Unknown holes in the motherboard of the CBM610

From: Baltissen, GJPAA (Ruud) <ruud.baltissen_at_apg.nl>
Date: Thu, 26 Apr 2018 10:33:45 +0000
Message-ID: <54F350D2C6501448A3EE14B7854C5FB575271DE3@WSV10441N3.office01.internalcorp.net>
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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Received on 2018-04-26 13:00:02

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