Scramble characters when scrolling

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By blackmsx

Expert (77)

blackmsx's picture

24-12-2015, 17:50

Hello,

I've very recently borrough a Sunrise IDE cartridge from a friend. He hasnt using it in many years...

The cartridge seems to work fine: I flashed it with Nextor 2.0.4 and I was able to create partitions, copy and load files from MSX-DOS and from BASIC.

Now the problem is that whenever the cartridge is plugged the characters in the screen start to get scramble as the screen scrolls up. Here are some pictures to illustrate what Im saying:



You can see how gradually the characters are mess up when the screen scrolls.
This happens in screen mode 0, but if the screen is set to mode 1 all is fine.

Im using a HB-F9S with 512k internal RAM...

Any ideas on what is happening?

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By flyguille

Prophet (3028)

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24-12-2015, 17:52

nope, did you try to clean the cart conectors?

did you try to flash it again?

By blackmsx

Expert (77)

blackmsx's picture

24-12-2015, 17:59

Yes, I flashed it a couple of times, and also notice the problem was present before flashing it.

The contacts on the cart seems clean (no rust)...

If I connect it to a MSX1 I have, Nextor boots in MSX-DOS1 mode as spected and theres no problem with test scrolling...

By Manuel

Ascended (18160)

Manuel's picture

24-12-2015, 18:30

Does it also happen in basic, without any cartridge plugged in?

By blackmsx

Expert (77)

blackmsx's picture

24-12-2015, 18:43

It does not happens when the cartridge is unplugged.

When the cart is plugged it happens in basic and in MSX-DOS ( and if the screen is set to mode 0)

By ARTRAG

Enlighted (6547)

ARTRAG's picture

24-12-2015, 18:50

Power adapter insufficient?

By blackmsx

Expert (77)

blackmsx's picture

24-12-2015, 19:38

Im powering the CF adaptor with an ATX psu... should I measure the tensions inside the machine?

By Manuel

Ascended (18160)

Manuel's picture

24-12-2015, 19:46

Perhaps the PSU of your MSX is dying and only just sufficient. Adding the cartridge may now already overload it. Just guessing here, though.

By blackmsx

Expert (77)

blackmsx's picture

24-12-2015, 19:51

But it does work ok when I plug another cartridge. A floppy controller for instance cause no problems.

I will measure the tensions though, just in case

By RetroTechie

Paragon (1563)

RetroTechie's picture

24-12-2015, 20:00

blackmsx wrote:

Im powering the CF adaptor with an ATX psu... should I measure the tensions inside the machine?

Check voltages from that ATX psu too... while in use. Btw have you tried with other CF card(s)?

By blackmsx

Expert (77)

blackmsx's picture

24-12-2015, 20:30

I've measured the tension inside the machine. I get +4.8 volts on the +5 rail and 11.7 on the +12 rail. The values dont change much when the IDE cart is plugged (they fall about 0.05 volts or so).

I tryed another CF card and it does fairly the same, although it seems to take a bit more time until the problem appears.

What I realized is that if I boot without a CF card inserted the problem is gone...

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