[Coco] PEEK for detecting CoCo arrow keys, etc.?

[Allen Huffman]

Thank you, Art and Rogelio, for this. I remember “keyboard rollover table” now, but not the details. If the keyboard was read through two PIAs (8 bits each), why did they split that out in to 8 memory locations in BASIC?

If I was writing something in assembly, I assume all of this is still polled by BASIC unless interrupts are disabled? (Scanning during the IRQ?).

> On Dec 19, 2014, at 7:20 PM, Arthur Flexser <flexser at fiu.edu> wrote:
> 
> Further...
> 
> To determine which peek values correspond to which arrow keys, run the
> following:
> 
> 10 FOR I=&H152 TO &H159
> 20 PRINT PEEK(I);:NEXT:GOTO 10
> 
> Then press each arrow key to see which byte changes, and what value it
> changes to, for that key.
> 
> Art