OCM: questions and answers

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By SaebaMSX

Hero (533)

SaebaMSX's picture

07-01-2008, 23:39

Hmm, then that is the reason to change the mode to 80 columns every time I turn on my 1chip. Tongue

By Yukio

Paragon (1540)

Yukio's picture

07-01-2008, 23:56

Another desire of very (new) nice games with some frustration!

So, if this thing does not have a tape port or a Real Time Clock ...
Is this any good for cartridge games?

By multi

Expert (74)

multi's picture

08-01-2008, 03:57

So, if this thing does not have a tape port or a Real Time Clock ...
Is this any good for cartridge games?

It does have a tape port:

DIP 3 - red cinch select
0 = data recorder input/output <--- Ohh Nooooo, now we can't complain about that anymore.....
1 = sound output (emulated sound only)

It has a clock, it just forgets the time after you turn it off. Then again, which MSX software doesn't work if the date/time is not correct? But yes, you can still complain about it, so it serves at least that purpose. Might be more useful this way even right?

why all this would make it unsuitable for cartridge games is beyond me though ...

Hmm, then that is the reason to change the mode to 80 columns every time I turn on my 1chip.

Just make an autoexec.bas file on your SD card to set all the settings you like Wink

By SaebaMSX

Hero (533)

SaebaMSX's picture

08-01-2008, 11:09

Just make an autoexec.bas file on your SD card to set all the settings you like Wink

Yeah, I did it when I had my F700 and I had to get a faster diskdrive, 60Hz, etc. It was no the faster way but as it worked I did not mind. Smile

Anyway, I was testing OCM and it surprised me in the good way, since I did not have problems with most of tested software.

By Yukio

Paragon (1540)

Yukio's picture

08-01-2008, 13:05

It does have a tape port:

DIP 3 - red cinch select
0 = data recorder input/output <--- Ohh Nooooo, now we can't complain about that anymore.....
1 = sound output (emulated sound only)

It has a clock, it just forgets the time after you turn it off. Then again, which MSX software doesn't work if the date/time is not correct? But yes, you can still complain about it, so it serves at least that purpose. Might be more useful this way even right?

why all this would make it unsuitable for cartridge games is beyond me though ...

Coolness factor.
This is cool!!


Just make an autoexec.bas file on your SD card to set all the settings you like Wink

Not so cool ...

By snout

Ascended (15187)

snout's picture

08-01-2008, 15:16

a - Of course you can run cartridge games on the OCM, as it has 2 cartridge slots
b - Instead of an autoexec.bas, one could also program the favorite default config in FPGA. Or perhaps an RTC-on-cartridge?

By Yukio

Paragon (1540)

Yukio's picture

08-01-2008, 15:29

A RTC-on-cartridge could be nice (especially for MSX1 games!)... After all, some other "Computers" of that era missed a Real TC. Only available as a add-on board . I think that some circuit with time could be useful for video or audio synchronization , I am not sure if demonstration programs and games used this as a feature ...

By multi

Expert (74)

multi's picture

08-01-2008, 18:31

There is a real time clock emulated in the OCM, only thing is it forgets the time when you turn it off. It will work for computing synchronization timing for line interrupts or something though.

By mouser

Expert (90)

mouser's picture

20-01-2008, 01:39

Thanks Manuel! DIP switch 4 worked for me!

BTW, your FlashROM card was the first thing I tested on OCM. Smile

Nice to hear you use it often Smile


Another question: I noticed that white colour with the composite signal is "uneven", its shades vary from very pale blue, greenish, yellowish. In VGA mode, however, it's perfect. Did you notice the same with yours?

I always used S-Video or VGA. I have tested composite video and you are right. It seems there is something wrong.
Different colors are shown depending on the place there is a white pixel. I tried other colors (red, green blue) and some parts of the letters are missing, like if there is something wrong with the resolution. oO

I have received my OCM a few days ago and noticed exactly the same. Tested with two TV sets, white letters are anything but white. Not able to test the S-Video but the VGA seems ok. Is there any solution to this problem ?

By jltursan

Prophet (2619)

jltursan's picture

20-01-2008, 02:35

You know, NTSC=Never The Same Colour Smile. It's the drawback of the original japanese OCMs...

Use the VGA or even the RGB feature on the same connector.

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