[Coco] Weird CoCo 2 keyboard problem -- any ideas?

[Bill Pierce]

Yep... Swap the keyboards, If it the questionable keyboard still don't work in the other Coco, Broken trace. If the "good" keyboard don't work in the questionable machine... blown PIA most likely.

Bill Pierce
My Music from the Tandy/Radio Shack Color Computer 2 & 3
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-----Original Message-----
From: John W. Linville <linville at tuxdriver.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Sat, Mar 30, 2013 12:01 pm
Subject: Re: [Coco] Weird CoCo 2 keyboard problem -- any ideas?


On Fri, Mar 29, 2013 at 07:33:57PM -0400, Arthur Flexser wrote:
> Very strange.  I suppose one question one might investigate is whether the
> shifted / is detected at all, but misidentified as a nonprinting character,
> versus whether it is entirely unseen.  What happens if you run
> 
> 10 PRINT ASC(INKEY$);: GOTO 10
> 
> and type a question mark?

The version above gives FC errors.  I refactored as below:

10 A$=INKEY$
20 IF A$="" THEN 10
30 PRINT ASC(A$)
40 GOTO 10

The program above prints 47 for '/' and nothing at all for '?'.

I did, however, discover that my initial report was a bit mistaken.
I found that SHIFT-7 (the apostrophe) wasn't working either.
This shares the same keyboard column as the '/' (aka '?') key,
as well as the SHIFT key itself.  Sure enough, after entering
lowercase/inverse mode (i.e. after SHIFT-0) typing 'W', 'O', and 'G'
all work but SHIFT-W, SHIFT-O, and SHIFT-G go undetected.  Guess which
column they all share?

Swapping-out the keyboard assembly seems like a logical next step...

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville at tuxdriver.com			might be all we have.  Be ready.

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