One chip MSX improvement project | MSX Resource Center (Página 17/123)

Por SaebaMSX

Hero (533)

19-05-2008, 21:06

The problem of timing has not been solved yet

Seems to be hard to be corrected. Good luck with it!

Por KdL

Paragon (1450)

22-05-2008, 17:30

Quartus II Software v8.0

Visit the download center on June 2, 2008 to download Altera's design software version 8.0, including Quartus II subscription edition and web edition software.

http://www.altera.com/support/software/download/sof-download_center.html

Other infos at:
http://www.altera.com/products/software/products/quartus2/whats_new/qts-whatsnew.jsp

Por HRA!

Champion (289)

23-05-2008, 15:40

A new problem was discovered.

(1) VGA output
I purchased a new monitor. (http://www.iodata.jp/prod/display/lcd/2007/lcd-mf241x/index.htm)
Even if it connected OCM/DE1 to this monitor's analog RGB, a display did not come out.
However, the output of the sample circuit of DE1 was displayed.

It seems that a problem is in the VGA output timing of OCM.

(2) Cannot write to SD Card on DE1 version
It seems that it cannot write to SD card on DE1 version.

> Quartus II Software v8.0

It is pleasure LOL!

Por SaebaMSX

Hero (533)

24-05-2008, 08:09

HRA, I do normally connect OCM to RGB monitor/TV with a cable converting from DB9 to SCART. This cable works in some TVs but not in other ones. I thought it was related to volts in the pinout of OCM since some TVs are more sensitive to this.

I've tested OCM, with original firmware not with your versions, directly to a Sony VGA monitor (19" ) and it works perfect.

Timing problems seem the neverending problems with OCM.

Good luck again!

Por HRA!

Champion (289)

24-05-2008, 08:40

There is a margin in an ordinary monitor.
Even when the output of OCM is somewhat unusual, the monitor side absorbs.

But, it seems that the monitor which I use has few margins.

There are two problems in the output of OCM.

(1) The width of H-SYNC is narrow.

A monitor with few margins cannot recognize a horizontal position correctly.

(2) DE1 has a late clock.

OCM is operating at 21.477MHz.
DE1 is operating at 20.925MHz.
Therefore, in DE1, it is set to VGA-58Hz and the monitor which cannot display comes out.

Por jltursan

Prophet (2619)

24-05-2008, 13:32

HRA, I do normally connect OCM to RGB monitor/TV with a cable converting from DB9 to SCART. This cable works in some TVs but not in other ones. I thought it was related to volts in the pinout of OCM since some TVs are more sensitive to this.

I've seen his before. Tested over several RGB monitors, the OCM still refuses to display in one of them; no matter what kind of tricks I use, this one (an Amper exelvision) always shows the screen rolling vertically