Boot selector for 50/60 hz ...

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Por Yukio

Paragon (1540)

Imagen del Yukio

15-08-2010, 01:57

Does anyone possess a boot loader with a option to switch from 50hz PAL to 60hz PAL !?
In Brazil we use PAL-M, we can not use the correct colour signal ... But there is a nice and stable B&W picture. Some newer television sets can handle quite well the 50 hz frequency, into 60 hz (like in Blue Warrior) the screen seems to get bigger! Does anyone have a boot disk for use with other games !? It seems that there are colour converters to change the PAL signal to NTSC, this only works into televisions that already can display 50/60 hz signal but miss the PAL colour decoder ...

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Por flyguille

Prophet (3031)

Imagen del flyguille

15-08-2010, 03:31

yukio, I asume that you are using a dsk copy of the game.

just patch the game in the instruction where it sets the screenmode

use a emulator + debugger to see the exacto opcode-data.

Por Yukio

Paragon (1540)

Imagen del Yukio

15-08-2010, 04:40

Is there a boot disk that use the switch ? I remember that some Euro productions already features this switch ... A patch for each game would need a lot of disks.

(But the image is better, it should be even better with a Philips colours television!)
Black & White images do not "blur" the colours, because of it some images are sharper than coloured images.

Por flyguille

Prophet (3031)

Imagen del flyguille

15-08-2010, 05:49

offcourse, and also seeing NTSC in a PAL TV, means seeing the image with better contrast/bright because the Y signal levels is different, and the VERTICAL is reducing the V-Size by showing 60hz instead of 50hz.

is another fidelity because there is not interleave (IIRC)

PAL color, is not capable to show the color in a 1 MSX pixel definition, because the bandwidth of the color signal was cuttered off, so, all sharp details in the color is blured, mixed, with hor_pix-1 and hor_pix+1. motds?, when the TV transicioned from black & white to color, the standard enginering had the goal of making it RETRO-compatible without any modification in old BLACK & WHITE TV sets.

So, the only one bandwidth space in a channel bandwidth, between Y signal and sound signal, but that wasn't enought.

But with digital TV that all is the past.

Argentinia is transmitting in DIGITAL since a month ago by AIR transmission.

Later, the analog transmissions will be shut down.

Por NYYRIKKI

Enlighted (6016)

Imagen del NYYRIKKI

15-08-2010, 12:22

Is there a boot disk that use the switch ? I remember that some Euro productions already features this switch ... A patch for each game would need a lot of disks.

Can't you just do VDP(10)=0 before loading the game?

Por Manuel

Ascended (19273)

Imagen del Manuel

15-08-2010, 12:53

Actually, there is a program which can start games after setting the VDP to 50/60Hz... But I forgot the name.

Por NYYRIKKI

Enlighted (6016)

Imagen del NYYRIKKI

15-08-2010, 13:22

Program?

How about just:
RUN"AUTOEXEC.BAS"
... or ...
poke &HF346,1:_SYSTEM

Por meits

Scribe (6530)

Imagen del meits

15-08-2010, 15:29

Unless the frequency is set in the game itself, that'll work indeed...

Por Yukio

Paragon (1540)

Imagen del Yukio

15-08-2010, 18:11

Is there a boot disk that use the switch ? I remember that some Euro productions already features this switch ... A patch for each game would need a lot of disks.

Can't you just do VDP(10)=0 before loading the game?

Well, thanks.
I will try to modify the MSX-BASIC loader.

Some disks would need a code to start up the loading ... I could probably copy some bytes from old magazines. Copy protected disks would need a MSX-DOS or other types of boot sectors ... The CALL SYSTEM tip should work with most of the programs.

Does anyone have a custom DOS loader ? In the past there seems to be some discussion about the implementations of DOS for 8-bit systems. I also want some CP/M compatible programs, the problem again is the disk access.

Por Yukio

Paragon (1540)

Imagen del Yukio

16-08-2010, 06:46

Is there a boot disk that use the switch ? I remember that some Euro productions already features this switch ... A patch for each game would need a lot of disks.

Can't you just do VDP(10)=0 before loading the game?

Blue Warrior works with the addition of VDP(10)=0 on the file BLUE.BAS.

Por meits

Scribe (6530)

Imagen del meits

16-08-2010, 06:56

Somehow I remember that you don't want to do vdp(10)=0 in a graphical screen. Iirc you will loose some lines in the bottom.
It's like 16 years ago, but i think the more elegant way is vdp(10)=vdp(10)or253.
Try that and flame me if i was wrong Hannibal

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