At 02:33 AM 12/11/98 -0200, you wrote:
>Hello all.
>
>I'm trying to run some softwares here (most demos) in my brazilian MSX,
>which runs with my TV in 60hz. Those software switch to 50 hz, so my TV
>can't display the image right. How can i fix this?
Typical assembly fragment that switches to 50Hz looks like this:
LD A,2
OUT (#99),A
LD A,#89
OUT (#99),A
in bytes that is:
3E 02
D3 99
3E 89
D3 99
If you change "02" into "00", you'll get 60Hz display.
Some programs use 192 lines, in that case "82" should be changed into "80".
However, this won't fix all programs:
- some programs use another (more compatible) way of changing frequency
- some programs depend on the 50Hz frequency and will not run well on 60Hz
(because they have less clock ticks to spend per interrupt)
Bye,
Maarten
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