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    Subject: [Bug report] [0.9.0 x86/Linux] Sine / Cosine emulated incorrectly 
for QuickBasic 4.5
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> --- Begin Message ---
>
>
>
> Subject: 
>
> [Bug report] [0.9.0 x86/Linux] Sine / Cosine emulated incorrectly for	QuickBasic 4.5
>
>
>
>
> Date: 
>
> Thu, 5 Jul 2007 13:54:27 +1200 (NZST)
>
>
>
>
> Hey there,
>
> I've been doing a bit of programming with QuickBasic
> using MS-DOS 6.22 running under QEMU 0.9.0/x86/Linux.
> It's all fine and dandy except for one (big) problem:
> sin() and cos() don't work correctly.
>
> Here's a demonstration:
> http://nonlogic.org/dump/bin/1183539319-glitchy.exe
>
> It works fine on a real PC, and even VMWare, but not
> under QEMU. I'm pretty sure it's QEMU, as I don't have
> the problem running it under QBasic 1.0, which I hear
> *emulates* sin() and cos(). But, let's face it,
> compared with QuickBasic 4.5, QBasic 1.0 sucks.
>
> What happens under QEMU is, after drawing 1/8, it
> draws the third 1/8 when it should be drawing the
> second 1/8, and vice versa. Same goes with the sixth
> and seventh 1/8s.
>
> Here's the source code:
>   CONST pi = 3.141592653589793#
>   CONST p256 = pi / 128
>   
>   SCREEN 13
>   FOR i = 0 TO 31
>     PALETTE 0 + i, i * &H10101
>     PALETTE 32 + i, i * &H2
>     PALETTE 64 + i, i * &H200
>     PALETTE 96 + i, i * &H202
>     PALETTE 128 + i, i * &H20000
>     PALETTE 160 + i, i * &H20002
>     PALETTE 192 + i, i * &H20200
>     PALETTE 224 + i, i * &H20202
>   NEXT
>   
>   FOR i = 0 TO 256
>     PSET (i, 0), i
>     px = 160 + SIN(i * p256) * 80
>     py = 100 + -COS(i * p256) * 80
>     PSET (px, py), i
>     t = TIMER
>     DO: LOOP WHILE TIMER - t < .01
>   NEXT
>
> Note that it breaks with ANY use of sin() or cos()
> under QB4.5.
>
> --GreaseMonkey
>
> Send instant messages to your online friends http://au.messenger.yahoo.com 
>
>
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