Previous Thread
Next Thread
Print Thread
Page 409 of 409 1 2 407 408 409
Joined: Jan 2021
Posts: 138
Likes: 3
=
Senior Member
Offline
Senior Member
=
Joined: Jan 2021
Posts: 138
Likes: 3
Originally Posted by hap
Is R12 brown,black,red or brown,black,orange?
Is R7 red,violet,orange, or red,violet,brown (orange makes it sound bad)
What are the colors on C6? brown,black,orange? Or is that backwards?
Is C5 100nf like C3?
Are the diodes 1N4002? I don't think this one matters much.
...

R12 on my Trinitron looks brown,black,orange,gold. R7 is red,violet,red,gold. C5 seems to be printed "104M" which is likely 100nF.

C6 looks brown,black,orange,dark blue(???),grey on pink background material. The ring near grey may be also brown or black or dark violet, but it has a different hue than the given brown and black ring of that component. I have several photos of it, but it is dark and shimmers differently on all of them. It is darker than other such rings and might be simply black and shows a hue due to reflected light by the different angle of the bulged package shape.

I did not examine the diodes; they are hard to see without desoldering and likely plain silicon. On D3 I see "400..." On D4 I see a "2" near the ring and a "4" in the 2nd row. (Strange is that many parts have stray solder blobs on top like when a previous owner had soldered at them too.)

Regard that the volume envelope duration (point where decay falls silent) differs with battery voltage. They are 5x 1.5V, so maximum +7.5V (unpleasantly loud, long decay) but it works well below 5V (shorter decay, noise waveforms a bit weaker?).


Quote
There's another handheld that needs netlist sound, Coleco Galaxian. It has a sound effect when an enemy dives down. Kevtris made photos of the PCB but one capacitor is hiding in the photo, and some resistor color bands are hard to see.
It also has a weird "PUT" transistor that I don't think MAME supports.

Is it a sawtooth generator like this, or the other (sine?) oscillator?

http://www.incbtech.com/index.php/16-how-they-work/2916-how-diacs-and-puts-work-art397e

Last edited by =CO=Windler; 01/07/23 03:24 AM.

MAY THE SOFTWARE BE WITH YOU!

{weltenschule.de}
Joined: Mar 2002
Posts: 1,313
Likes: 74
H
hap Offline
Very Senior Member
Offline
Very Senior Member
H
Joined: Mar 2002
Posts: 1,313
Likes: 74
Can you upload the other pcb photos?
Here is R7 at 2.7K(red violet red) and 270(red violet brown): https://tsk-tsk.net/net/temp/sfx_r7.zip

- power on
- synth mode
- press a note key (resets parameters)
- F12C
- play keys EDCBA
- F30C
- play keys EDCBA

Which one sounds more like the real one?
I don't mean the pitch or the decay rate, but the buzz in the background, especially on F30C with R7=2.7K.

Youtube video of Coleco Galaxian, fast foward to 2:30

Sound is too high pitch for me to determine by ear if it's a saw wave. And I don't really care what the exact waveform is, just that it's not simple enough to simulate accurately without a netlist in MAME.

Joined: Jan 2021
Posts: 138
Likes: 3
=
Senior Member
Offline
Senior Member
=
Joined: Jan 2021
Posts: 138
Likes: 3
There is really nothing in them I have not already thoroughly explained! This is everything I have (including box arts and my messy schematics).

https://www.file-upload.net/download-15072469/SoundFXPhasor_bigPics.7z.html

In the original the buzzing bass subvoice is definitely stronger than in both your examples. It is more a bit like a slapbass or plucked ruler humming in the background (or a low organ footage). But that is also because your pitch (clock rate) is 1 note too high (your "D" note is my "E", so I can't reach your "E").

Your sfx_r7_2700.wav example sounds closer, but R7 definitely is red-violet-red-gold.


With the Coleco Galaxian tabletop I suspect that they used a VCO with analogue fixed falling pitch envelope generator because the chip would have been incapable to compute the stepless howl without wasting too much CPU time.

Last edited by =CO=Windler; 01/08/23 04:36 AM.

MAY THE SOFTWARE BE WITH YOU!

{weltenschule.de}
Joined: Mar 2002
Posts: 1,313
Likes: 74
H
hap Offline
Very Senior Member
Offline
Very Senior Member
H
Joined: Mar 2002
Posts: 1,313
Likes: 74
Thanks for uploading those photos, yes R7 is red,violet,red.

Joined: Mar 2002
Posts: 1,313
Likes: 74
H
hap Offline
Very Senior Member
Offline
Very Senior Member
H
Joined: Mar 2002
Posts: 1,313
Likes: 74
@Rik when you're reading:

It's not important, do you have the original photo of https://www.handheldmuseum.com/Guts/Bandai-UBoatGuts.jpg
Or the handheld itself, and can see the label?

Another trivia: I'm pretty sure that this is the JP version of Flight Time: https://www.handheldmuseum.com/Bandai/BattleBeam.htm

And one thing that is more interesting: https://www.handheldmuseum.com/Bandai/Galaxian.htm
There are 2 versions. One that has the Star Wars jingle at start, and one that has a jingle that sounds like Namco's Galaxian arcade. The 1st version(Star Wars I think) is on a NEC D553 MCU. So if your MCU note is correct, they ported the game over to NEC D7502G to just change the startup jingle.

Last edited by hap; 01/26/23 10:35 AM.
Page 409 of 409 1 2 407 408 409

Link Copied to Clipboard
Who's Online Now
1 members (Pernod), 23 guests, and 4 robots.
Key: Admin, Global Mod, Mod
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Forum Statistics
Forums9
Topics9,158
Posts119,911
Members5,034
Most Online1,283
Dec 21st, 2022
Our Sponsor
These forums are sponsored by Superior Solitaire, an ad-free card game collection for macOS and iOS. Download it today!

Superior Solitaire
Forum hosted by www.retrogamesformac.com