Re: help diagnosing an Apple IIe, please.

[Jerry <awanderin@yahoo.ca>]

"Michael J. Mahon" <mjmahon@aol.com> writes:

> Jeff Blakeney wrote:
>>   To: Michael J. Mahon
>> On Fri, 27 Feb 2009 15:32:30 -0800, Michael J. Mahon wrote:
>>
>>
>>>You can also GET the key after determining that one has
>>>been pressed:
>>>
>>>40 IF PEEK(KB)>127 THEN GET A$
>>
>>
>> Does the GET clear the keyboard strobe as well?  If so, that is really
>> cool and is something I never knew.  I'll have to remember that one.
>
> Yes, it does.  (It would have to to avoid GETting the same keypress
> over and over.)
>
> The only way to sense the keyboard from Applesoft without clearing
> the strobe is to PEEK it.  In this case, it is PEEKed to avoid waiting
> at the GET when no key has been pressed.
>
> -michael

Well, you can use the WAIT instruction to sense the keyboard without
clearing the strobe:

   WAIT 49152, 128

It waits until the value at the memory location 49152 bit-wise ANDed
with 128 is non-zero.


-- 
Jerry    awanderin at yahoo dot ca