I re-read your pages and the manuals I have. Frankly it's confusing.
Here is how I interpret what I have read:
...seems to indicate that only If I am using a baudout TT I need the 74LS74
chip in the L slot, otherwise no IC is needed in IC L.
Take a look at page 17 of 37:
How do you interpret this? This is my source for why I think that the
74L123 is needed in slot L.
1) Do I need *any* chip in the L slot?
2) Do you have a working system that uses a terminal? If you have a
working system than I would like to try to match your configuration, being
that it works! Schematics confuse me.
How does your motherboard I/O circuitry compare with mine?
Thanks very much.
At 06:36 PM 3/2/2007 -0500, you wrote:
>Well, it seems very odd that with the same rev1-6X motherboard that MITS
>would use two different IC's. I checked your pics of the motherboard and
>its the same as mine. I also have the round toggle switches on mine.
>Have you check the Assembly doc PDF's I posted online to compare ?
>All I remember is that the 680 had a front panel with a different color,
>aside from a different rev motherboard too I suppose. I recall seeing a
>pic online somewhere but I don't seem to have that bookmark.
>I posted sheet 2(rt.half) from my schematics showing IC L being a
>74LS74, the pinouts checkout accordingly.
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