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Search took 0.00 seconds. Search: Posts Made By: mc6809e

Forum: Coders. Asm / Hardware

19 November 2014, 03:45

Replies: 57

Joystick reading code

Views: 16,456

Posted By mc6809e

Oh, that's fast for sure, Thorham. What's...

Oh, that's fast for sure, Thorham.

What's cool is the code starts to look a bit like SIMD. And the obvious extension with longs to handle joy2dat too let's you process 4 pairs of bits at a time.
...

Forum: Coders. Asm / Hardware

18 November 2014, 23:13

Replies: 57

Joystick reading code

Views: 16,456

Posted By mc6809e

Possibly, so I'll just concede the point, then. ...

Possibly, so I'll just concede the point, then.

I just find it enjoyable to try and puzzle out faster and faster code.

I can't be the only one here that thinks that's fun.

Forum: Coders. Asm / Hardware

18 November 2014, 22:51

Replies: 57

Joystick reading code

Views: 16,456

Posted By mc6809e

Actually the jump table is the more flexible...

Actually the jump table is the more flexible technique.

There's nothing that says the addresses in the table have to point back directly into the game code.

The destination addresses for the...

Forum: Coders. Asm / Hardware

18 November 2014, 22:23

Replies: 57

Joystick reading code

Views: 16,456

Posted By mc6809e

joy.left=$0300 joy.right=$0003 joy.up=$0100 ...

joy.left=$0300
joy.right=$0003
joy.up=$0100
joy.down=$0001
joy.upLeft=$0200
joy.upRight=$0103
joy.downLeft=$0301
joy.downRight=$0002

move.w #0,joytest(a5) ;16c

Forum: Coders. Asm / Hardware

18 November 2014, 06:05

Replies: 57

Joystick reading code

Views: 16,456

Posted By mc6809e

How about a jump table? move.w...

How about a jump table?

move.w joy1dat(a5), d0 ;12c 0f
andi.w #$0303, d0 ;8c 0f
ror.b #2, d0 ;10c 6f
asr.w #4, d0 ;14c 10f
movea.l stick(pc,d0.w), a0 ;18c 2f
jmp (a0) ;8c 0f

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