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Log in| Search found 12 matches |
| Author | Message |
|---|---|
 Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
 Forum: Handheld Games Posted: Wed Oct 23, 2013 1:16 am Subject: Grandstand Firefox F7 - Sound chip very hot |
Wonderful, thanks for the heads-up!  One step closer to a full, commented listing of the assembler program...
Regarding my sound chip problem... the situation is stalled, does anyone have any ne ... |
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| Topic: Pica Pic emulated handheld games |
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| Quaxo76 Replies: 2 Views: 4342 |
Forum: Handheld Games Posted: Sat Sep 14, 2013 1:49 pm Subject: Pica Pic emulated handheld games |
| Wow, just found it today... I'm amazed at the quality of the simulations. I have a real "SA-20 sub attack" and it feels... just right.
The "attract mode" acts differently, which ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Tue Jul 23, 2013 2:43 am Subject: Grandstand Firefox F7 - Sound chip very hot |
| OK, I'm back. The new zeners arrived and I replaced all three.
The problem isn't solved. Now I measure 5V across the 5.1V zener S11 (which is good); 9.1V across the 9.1V zener S12 (which is great); ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Wed Jun 26, 2013 1:36 am Subject: Grandstand Firefox F7 - Sound chip very hot |
| This specific zener "pushes" the IC voltage of the 1771 above the Vdisp, and when it does not push it far enough, the net voltage over the IC may become too high.
That makes sense, thank yo ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Tue Jun 25, 2013 11:10 pm Subject: Grandstand Firefox F7 - Sound chip very hot |
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It's quite easy to get a fresh zener. Try a new one yes. I was running low on electronic components, so I ordered a whole set (you know, like 20 pieces for each value of each kind of common compone ... |
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| Topic: Nintendo Mini Classics |
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| Quaxo76 Replies: 4 Views: 6839 |
Forum: Handheld Games Posted: Tue Jun 25, 2013 2:18 am Subject: Re: Nintendo Mini Classics |
| Does anyone here collect them? I think I have just about every single one, except maybe sudoku.
I don't have them but was thinking to buy a few. How do they compare to the originals? Re. gameplay, ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Tue Jun 25, 2013 1:10 am Subject: Grandstand Firefox F7 - Sound chip very hot |
| I desoldered the diodes this morning.
The diode between pin 5 of the CPU and the transformer (identified as 6.2V in the schematic), has the markings "5.83" or "5.B3". The diode ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Mon Jun 24, 2013 4:30 am Subject: Grandstand Firefox F7 - Sound chip very hot |
| S10 is the 12V zener, so that one is way off. (Check the value on the zener. I'm not 100% sure it is a 12V on this game in that position. They usually show the volt value in 2 digits black print)
Tha ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Mon Jun 24, 2013 3:07 am Subject: Grandstand Firefox F7 - Sound chip very hot |
| OK, I took some readings.
I was unable to find out which diodes are actually "Zener 1" and "Zener 2" in your list (I need to see the schematic with a higher resolution screen to ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Mon Jun 24, 2013 2:08 am Subject: Grandstand Firefox F7 - Sound chip very hot |
| Rik,
I know the visual6502 site very well, the 6502 is actually the cpu I know best! But what I was thinking isn't actually for an emulator, it's just that it would be interesting to have a listin ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Sun Jun 23, 2013 1:22 pm Subject: Grandstand Firefox F7 - Sound chip very hot |
| Hi blanka,
thank you very much for your reply! The sound chip is a microcontroller as well, not an amp or so, and it should not get hot. So my guess that something was wrong, was right! :/ Even ... |
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| Topic: Grandstand Firefox F7 - Sound chip very hot |
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| Quaxo76 Replies: 16 Views: 22318 |
Forum: Handheld Games Posted: Sun Jun 23, 2013 8:35 am Subject: Grandstand Firefox F7 - Sound chip very hot |
| Hello,
I just recently acquired two nice Grandstand games, the Firefox F7 and Scramble. I have a "soft spot" for VFD or LED games, and for vintage electronics in general... Anyway, they're ... |
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