Which laserdisc-players can be used with the MSX?

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By mohai

Paladin (932)

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05-07-2018, 19:03

Hello all !!!

Sorry for re-boot such an old post.
I am planning to get a Laserdisc player compatible with MSX.
I already own the PX-7 and would like to connect to a player.
I know of the possibles issues, due to NTSC and PAL differences, but that is another matter ...
The questions are:
Did anybody succeed to play a Laserdisc game with the proper setup?

There are several players which include the DIN-8 connector, as the LD-1000 but, others have the mini jacks. Which one to get? Are both connections suitable to play games?

As the service manual states, both DIN-8 and mini jacks connections are compatible to play games (see pages 8, 9, 14 and 18 to 21).
The manual says that "output 2 (mini jack)" is for laserdisc player LD-1100 and "output 3 (Din-8)" is for LD-700.
I think that other models with same connectors can be compatible too but I would like to make sure before getting one.

By Manuel

Ascended (18233)

Manuel's picture

05-07-2018, 19:17

It's not "possible issues". You really need an NTSC PX-7 and NTSC laserdisc player to play the MSX laserdiscs.

By mohai

Paladin (932)

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05-07-2018, 21:04

Manuel wrote:

It's not "possible issues". You really need an NTSC PX-7 and NTSC laserdisc player to play the MSX laserdiscs.

Thanks for the note.
I know that mixing NTSC and PAL video is not a good idea but, I think converting a PAL PX-7 to NTSC should not be too hard: Change VDP chip to 9928 (I already have some), change some clock crystals here and there and maybe something else.
I had a quick look at the service manual and every part is explained even more, I hope that the computer internals are ready to change to PAL or NTSC.

By Manuel

Ascended (18233)

Manuel's picture

05-07-2018, 22:36

OK, keep us posted, as I'm curious whether this works indeed Smile

By mohai

Paladin (932)

mohai's picture

24-07-2018, 20:21

Hello,
Just for some updates.

I did a quick look at the available service manuals from the different models (PX-7 PAL, PX-7 NTSC, PX-V60 ...), and found that the boards in these models are a bit different from each other.
There are some custom components that differ from PAL or NTSC versions and (maybe), converting a PAL one into NTSC would not be easy. I already have to study every manual and board in order to find out if it is feasible or not.

In the meantime, I thought that a simple NTSC to PAL converter can do the trick. I already ordered one and will purchase a NTSC player.

By mohai

Paladin (932)

mohai's picture

24-07-2018, 20:48

On the other hand, to play Laserdisc games with the MSX, I would like to know if MSX needs to be connected through the DIN-8 (like this) or can be connected through IN/OUT mini jacs (like these).

As per the PX-7 manual, both connectors are used to control different Laserdisc players, such as LD-700 and LD-1100.
As per some game instructions, there are some compatible models (back in 1984) such as LD-700, LD-7000, CLD-9000, LD-5000, LD-V500 or LOP-150.
I found that some of them use the DIN-8 connector for "System control I/O" (I do not know about others), but some modern models still have the mini jacks for I/O on them.
I wonder if I could use one of those modern models and still be able to play a game.

Anybody tried before?

By Alexandre_Taito

Champion (325)

Alexandre_Taito's picture

25-07-2018, 10:14

mohai wrote:

On the other hand, to play Laserdisc games with the MSX, I would like to know if MSX needs to be connected through the DIN-8 (like this) or can be connected through IN/OUT mini jacs (like these).
As per the PX-7 manual, both connectors are used to control different Laserdisc players, such as LD-700 and LD-1100.
As per some game instructions, there are some compatible models (back in 1984) such as LD-700, LD-7000, CLD-9000, LD-5000, LD-V500 or LOP-150.
I found that some of them use the DIN-8 connector for "System control I/O" (I do not know about others), but some modern models still have the mini jacks for I/O on them.
I wonder if I could use one of those modern models and still be able to play a game.
Anybody tried before?

I've tried. Mostly any Pioneer laserdisc with S-Control input port can be used, you connect palcom to laserdisc via a p2 (phono) mono cable. I have this video somewhere in my youtube...let me see...
https://www.youtube.com/watch?v=7JqAL1nc1uI&t=8s
BUT you can't convert a 50Hz palcom to 60Hz easily. The genlock circuit is way different.
Ah, you gotta connect the audio channels INVERTED. L goes to R and R goes to L, or else you won't load the program encoded on laserdisc

By mohai

Paladin (932)

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25-07-2018, 11:32

Alexandre_Taito wrote:

I've tried. Mostly any Pioneer laserdisc with S-Control input port can be used, you connect palcom to laserdisc via a p2 (phono) mono cable. I have this video somewhere in my youtube...let me see...
https://www.youtube.com/watch?v=7JqAL1nc1uI&t=8s
BUT you can't convert a 50Hz palcom to 60Hz easily. The genlock circuit is way different.
Ah, you gotta connect the audio channels INVERTED. L goes to R and R goes to L, or else you won't load the program encoded on laserdisc

OK!
Thanks a lot for the video.
So, as far as I understand, you can connect an NTSC player to a PAL PX-7 and the genlock will still work, although the refresh rate is different (60 Hz versus 50 Hz) and color encoding is different too, the computer is able to mix both image signals with no issue.

By Alexandre_Taito

Champion (325)

Alexandre_Taito's picture

28-07-2018, 02:00

Yep, but the video will be a mess :\

By mohai

Paladin (932)

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29-07-2018, 17:54

Alexandre_Taito wrote:

Yep, but the video will be a mess :\

Yes. You are right.
I did the test with an NTSC console and the PAL PX-7 and found some interesting behaviour.
The computer seems to be able to decode and mix NTSC with internal VDP image.
It shows NTSC over PAL correctly, BUT ...
VDP goes nuts when trying to synchronize with external video: VDP seems to change to 60 Hz, shows some extra lines on screen (showing some extra characters from a "forbiden" area in VRAM) and MSX freezes, until external video is disconnected.
I wonder if this can be fixed changing VDP chip with a 9928a (NTSC) ???

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