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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