LVA510 again :).

[Peter de Vroomen]

Sorry that I didn't reply to the postings anymore, I have been a bit too
busy to pursue my hobbies . I'd like to reply here and see if we can rake
up the discussion a bit .

First William, thanks for the tip, but I gathered something like that
already . What I'd actually be doing then is bypass the LVA510 chip and us
the RGB signals directly. But that's simply not what I want . I want to be
able to connect the computer to my TV, and my TV does not have a digital RGB
input (I could, however turn them into analog signals with a few resistors).

Now for Franc.

Is it possible you are attempting to watch a PAL signal on an NTSC TV?

Nope, I connect the MZ800 to a TV that understands both PAL and NTSC.
Furthermore, I have another MZ800 that does give off a coloured display. I
switched the modulator modules of both, and then got color from the MZ800
that was B&W first and B&W on the other one.

There is a 17.734475 MHz crystal connected to the video processor chip
via a jumper. This is 4 x 4.43361875, which is the PAL colour
subcarrier frequency.

Actually, I am having a look at the mainboard now and see a 17.17344
oscillator on the mainbord. It's the only oscillator I see, so probably the
whole system is synchronized to the TV timings (like the Amiga's).

Isn't the TBA510 a de-coder rather than an en-coder?

I have no idea . Who can tell me?

I had one other surprise today. I opened a Philips MSX2 computer today to
see what's wrong with it, and it also has a LVA510. It's on a small
daughterboard. This system has fuzzy video output.

I made some closeup pictures of the boards:
http://home.wanadoo.nl/p.vroomen/gfx/miscpics/lva510_msx2.jpg and
http://home.wanadoo.nl/p.vroomen/gfx/miscpics/lva510_mz800.jpg. Maybe
somebody recognizes the logo on the chip?

PeterV

 

[Peter de Vroomen]

Follow-up...

Maybe somebody recognizes the logo on the chip?

I gather from someone in another newsgroup that it's an IC made by Mitsumi
Electric Company.

PeterV