Відео

Its a common problem for various arcade boards that the reset circuit will often reset the battery backup to the RAM chips which is a big no no. How can you add isolation so that the reset circuit doesn't reset the battery backup to the RAM chips?

You take a rare, hard to find, 49 way Williams joystick that seems to only be used for 2 games, and then convert it to a 8/4/2 way joystick that are all over the planet and easy to find? Send me all of your Sinistar joysticks.

Great Job Brad, looks awesome, you do such great work.

On the molex header pins, what are the black ramp fittings used for and why do they have the black ramp fittings?

Great work much appreciated.

The #8 dipswitch in the boot start up sequence must jump the game code into game Test Diagnostics mode. I'm not sure what this is called? when the game code is "jumped" into game test diagnostics mode. Some games use JEDEC files which I'm not sure if the ROM files that has the game code are considered JEDEC files or what you call the ROM data files if they aren't JEDEC files?

Great work Brad. Can’t wait to see Josh’s Moon Patrol finished. Would appreciate if you could fix my MP when you have some free time.

So you're using an IR Lamp to activate all of the IR photo-transistors on the Optical Interrupter Board? I have never seen an IR Lamp on a electronic technicians work bench they must be not common to find IR lamps?

What types of problems are common with Optical Interrupters?

hi, Can you build me an arcade stick with a rotary stick and a spinner?

Man, Sinistar is amazing, let alone a new in box one. I’ve got a pretty decent collection of Williams hardware, but no Sinistar stuff. Nice work!

Why do some arcade boards don't use soft start? the soft starting circuit is only a capacitor?

Wow!! I was absolutely shocked when I first saw those pictures of that mint untouched Sinistar cabinet still in the cardboard box. Never thought my mods would end up running on it! What an absolute honor, thank you Brad!

Great stuff, Brad. As usual.

Excellent work, Brad!

Great idea using FR-4 to reproduce these!!!

What causes pinball games Lamp Ghosting issues and Problems?

Awesome work

Looks great Brad, nice work really cool.

Excellent work, as usual!

Are the ROM files available somewhere online?

Do you need a complete set, Or is it just a rom swap of a couple chips? (if you already own a tie-die set) Thanks

That is great. Definitely want 2

dude, mah neck

Hiya Brad! I'm looking to purchase some Sinistar stuff from you, including the new game/sound/speech ROMs and a couple red ball tops and shafts for a 49 way. Maybe a power supply and harness parts. What's the best way to contact you for this?

Looks awesome Brad. Always great work.

Neat and tidy work, boards now look brand new. Im in the UK but have the complete internals of Defender, just missing the main board mounting metal panel the boards sat into. Would love a kit to replace everything that can be upgraded :) I might, one day build the cabinet !

Never thought anyone would be interested in giving my favorite game an update. I doubt anyone will need the pause feature since you can get on record pace in just 7 minutes LOL it's not exactly a marathon game; but handy regardless. Looks like I gotta return and get that wr I was so close to setting 5 years ago

Nice work, as usual!

Great work guys! the "tie-dye" ROMs, Sinistar edition. Love it.

Can't thank you enough for your help, Brad! For those that are interested in how the difficulty mod works, I made a video on my UA-cam channel that goes into detail on how the game works and what was changed. Also hoping to have another documentary about Sinistar in the future with some developer interviews.

Awesome. Very cool!!!

Hey, it works on hardware, awesome! Had to think outside the box a little bit for this one. The game would pause immediately upon hitting the player 1 button to start the game, so there's an extra check in the code to see if the byte at RAM address $9800 is above $A0. $80 is player death and is also used at the very beginning of every player turn. So once that byte goes above $80, then it's possible to pause the game. In attract mode, this byte never goes above $38 or so, that way we don't pause the game during the high score screen or game instructions. The routine to erase the text on screen was not working initially as well but there was enough room to copy over the same routine the game uses to erase text, but this time it was slightly modified to erase the new "Paused" string. Keep it up with these videos, Brad!

that’s awesome

Happy to be of service and get that test switch working again! I was surprised to see that John Kotlarik left in an unused test in the speech processing program so I felt obligated to get it hooked up and working again with the main sound board diagnostics.

Been loving all the new videos, Brad! Keep up the great work!

cool, need this for Defender :)

Cool. Amazes me this and sinistar made it past qa.

Thank you Sir My Defender lives again without random Rom errors.

BEWARE - I LIVE!

do you still repair these boards

Can you make a video lesson on why switch matrix and lamp matrix need to use Diodes because of the strobe signal gets confused with the diodes are shorted. When the Diodes are shorted in one of the ROW the strobe is applied to each column one by one but not understanding if a diode is short why the strobe signal gets confused and errors happen on the matrix tests. When a switch is OPEN the bad diode is shorted the strobe signal doesn't get confused but when a switch is CLOSE the bad diode is shorted the strobe signal gets confused and errors happen in the matrix. I just don't understand what the purpose is for the diode because a GOOD diode allows the strobe signal to flow from column to row/return as well as a BAD diode allows the strobe signal to flow from column to row/return so there is no difference at all logically it doesn't make sense why the matrix will cause errors. The strobe signal looks like on the oscilloscope like a PWM signal or clock signal not sure what is so special about a strobe signal or how its different from a clock signal or PWM.

G'day Brad, Can I buy a couple of boards off you? I'm building a Robotron with a Jrok board and these sticks feel perfect, but tbh my technical ability is limited to good cable management, haha. Cheers Brett

Excellent. Just what I was looking for.Thanks.

Is this the joystick used in NFL Blitz? I want to make a PC joystick using an optical joystick. I just don't know how to do the conversion. Is this something you can help me with?

Link to product?

Early Williams Electronics, can you make a video explain the theory and how to troubleshooting the switch matrix circuits and lamp matrix circuit in pinball games?Why does some driver boards use SCR and other driver boards use FETs to turn on/off the switches and coils? the SCR causes flicking when using LED's any reasons why?Why does the flippers coils need a "interlock relay" any reasons why?

Amazing work on all of that, Brad! Really, really cool.

EARLY WILLIAMS ELECTRONICS< the Williams Defender uses a Matrix array for the RAM chips. Most arcade games don't have the RAM chips in this Matrix array. I'm not sure if the Williams Stargate is also using this Matrix array for the RAM chips. But not sure if you know the answer as to why they used the RAM chips in this matrix array for any reasons?

ROM chips don't output IRQ signals any reasons why, what chips in arcade games output IRQ signals? ROM chips have ROM signature values and ROM checksum values, but how do you get these Signature values and checksum values using a handheld calculator, what formulas do i use to get them?