If that was the case it would be trivial to calculate it using Ohm's law.
But there's no need for that as the max current is clearly indicated on the power supply: 0.67 A

BTW, I prefer using a 7.5V regulated supply which keeps the 7805 regulator cooler.
 

Decimal flag seems to start at 0 most of times when you power on the console, but  at very random event it could start at 1 and then I got problems.

Yup, I can confirm that in my short tests the D flag seems to be cleared most of the time when first powering on the console. But sometimes it gets set after a few power cycles, and chanches seem to increase if you try a different cart first. It's like if, once the flag is set by the previous cart, its status tend to persist on subsequent powercycles.
I tested 4 consoles from different eras and was able to replicate the glitch at least once in all of them.

 

I only noticed this glitch on my hardware like 2 times ever, and I thought was a cartridge connection problem, which was solved by re-inserting the cart (actually power cycling the console fix it).

Yeah, I think anyone would assume it's caused by dirty contacts in the cart slot or the power switch. And the fix is the same too: power cycle the console.

"Rescue Terra I" is an original release that has the same bug (you can see it glitching sometimes when starting the rom in Stella 6)
 

The game also have others small glitches that really annoys me, sorry about that.

I find it a really good game. The concept is interesting, graphics are really nice and it's fun to play. I will definitely revisit it in my next playsession. (and try to find the easter egg!)

I just played a few rounds and scoring seems to work the same both in Stella 6.0 and real hardware for me. Remember that you can only score a point if you have the serve (indicated by the arrow on the bottom of the screen). That's mentioned in the first post:
 

- Added serve rules (like in old volleyball rules). You need serve ball to score a point.
See the pointer in score.

As for the garbled gfx, that's actually a bug in the game: it doesn't initialize the decimal flag. You won't see this if you just load the game from the harmony menu (as the menu itself clears the D flag), but it might happen randomly when putting the game on a real cart.

In fact It happens on my hardware if I flash the harmony in single game mode too.
 IMG_20190125_105309.jpg   246.56KB   3 downloads
If it happens, you just have to powercycle the console until the glitch goes away. (Better leave the console off a few seconds before turning it on again, if you do it too quickly, it seems to keep the last state of the flag)

In stella, do the same by resetting the game with CTRL+R.

Stella 6.0 defaults to randomized CPU state, which is a more accurate representation of real hardware, while in Stella 5.x the default was to have it cleared (you can change that behaviour in the "developer tab" if you like).

I tried again and you're right: if I leave the console cool down for a while before testing those two games, I get the same kind of behavior.

Late 2600 Jr PAL (1991 copyright on the box):

 TIA.JPG   56.9KB   12 downloads

 

(I used NTSC roms for these screenshots, and my TV shows PAL color loss with odd number of scanlines)

 

Pesco

 IMG_20190119_224739.jpg   191.72KB   12 downloads

 

Masters of the universe

 IMG_20190119_224801.jpg   125.35KB   11 downloads  IMG_20190119_224806.jpg   141.88KB   12 downloads

 

Kool-Aid man (took a while to understand that I have to set the left diff to B to make it run...)

 IMG_20190119_224838.jpg   229.71KB   11 downloads

 

Thunderground

 IMG_20190119_224909.jpg   99.37KB   11 downloads  IMG_20190119_224919.jpg   224.98KB   11 downloads

 

Spider Fighter

 IMG_20190119_225042.jpg   104.35KB   11 downloads

 IMG_20190119_224955.jpg   113.5KB   13 downloads  IMG_20190119_224957.jpg   94.65KB   12 downloads

 

G.I. Joe

 IMG_20190119_225104.jpg   96.23KB   11 downloads

 

Cosmic Ark

 IMG_20190119_225133.jpg   95.02KB   11 downloads  IMG_20190119_225136.jpg   123.39KB   11 downloads

 

Hmove test

 IMG_20190120_104233.jpg   277.83KB   12 downloads

 

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PAL 7800

this one gave some trouble with bus stuffing and needs a couple minutes of warmup to stabilize its behaviour. I posted a video of the hmove test on the Stella github pages (https://github.com/stella-emu/stella/issues/246):

 tia.jpg   55.18KB   12 downloads

 

 

Pesco

 IMG_20190119_230829.jpg   201.92KB   11 downloads

 

masters of the universe

 IMG_20190119_230907.jpg   163.64KB   12 downloads

 

Kool-Aid man

 IMG_20190119_230946.jpg   214.97KB   11 downloads

 

Thunderground

 IMG_20190119_231025.jpg   265.43KB   13 downloads

this game needs a while to stabilize on this console. here are a few pictures taken while it was warming up:

 IMG_20190119_231741.jpg   367.01KB   13 downloads  IMG_20190119_231800.jpg   324.31KB   12 downloads  IMG_20190119_231805.jpg   313.77KB   11 downloads  IMG_20190119_231828.jpg   355.65KB   11 downloads

 

Spider Fighter

 IMG_20190119_231115.jpg   256.88KB   12 downloads  IMG_20190119_231120.jpg   165.28KB   12 downloads  IMG_20190119_231205.jpg   205.97KB   12 downloads

 

G.I. Joe

 IMG_20190119_231244.jpg   167.18KB   11 downloads

 

Cosmic Ark

 IMG_20190119_231317.jpg   204.33KB   11 downloads  IMG_20190119_231322.jpg   188.15KB   11 downloads

 

 

I have a few other consoles (including a working Tournament table arcade board), but it might take a while before I can test them (they're on storage and a few need some repair work).