[Atari800-users] (SDL) HELP with SHIFT/CONTROL + independent SHIFT and KEY bits in SKSTAT

[Jerzy K. <jer...@po...>]

Hello.
I fixed the behavior of the HELP key for SDL, because it wasn't able to 
use it with SHIFT or CONTROL so far. This made impossible switching 
standard and arabic character sets using SHIFT+HELP in Atari 65XE NAJM.

Additionaly I fixed SHIFT (bit 3) and KEY (bit 2) bit states in SKSTAT 
once the SHIFT key is pressing or releasing during other key is still 
depressed e.g. HELP or SPACE, and so on. Before my change depressing 
SHIFT made the key inactive, now it's still active. This is important in 
games like Robbo, that using arrow keys to control the main player and 
SHIFT to control the fire (rare, but nice feature).

I made all changes in shift_help branch of my fork of Atari800 
https://github.com/mono6502/atari800/tree/shift_help and can create pull 
request if you'd like to integrate it with main code.
Best regards
Jerzy Kut