Nascom 2 keyboard connector
Tony Duell
ard at p850ug1.demon.co.uk
Thu Jun 9 18:19:09 CDT 2005
>
> > same as a 16 pin IC). Meanwhile the CPU board keyboard connector (and
> > corresponding schematic) is numbered in a more conventional pattern with
> > odd pins on one side and even on the other.
>
> I thought IC connections were always numbered down one side then back up
> the other one? I've not seen any that are numbered across the chip?
Yes, but header plugs rarely are.
IC :
1 16
2 15
3 14
...
8 9
Header
1 2
3 4
5 6
...
15 16
>
> > Well the Nascom 2 keyboard seems to be very similar to the Nascom 1,
> > except that (as others have noted) it has an extra scan row so uses 7
> > data bits rather than 6.
>
> I can scan the relevant pages in the hardware manual; I've got the full
Does your Nascom 2 manual contain a keyboard schemmatic? I thought mine
was complete, but that's one thing that's definitely missing. I do have
scheamtics for the mainboard, 16K RAM board, 3A PSU, 3rd party EPROM
programmer, etc.
-tony
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