Okay. So, at 11:09 we see the jumbled test pattern. My Galaxian arcade keeps resetting from the test pattern to blank screen. Does that mean when it reaches the next test pattern "phase" that it is hitting a snag and not continuing? I found many of your videos super informative and very logical. Keep it up! Oh, and answer my question if you get the chance. :)
@atarilogic The game program is burned into the main ROMs on the PCB. Sounds like the CPU can access the test pattern portion of the program just fine but not the game portion. Simply reseating the ROMs may remedy this. If not.. it could be that you have a bad ROM.. or the circuitry that connects the CPU to the ROMs is messed up and will need to be repaired.
@Orthoshlep Yeah. Blitting is the process of writing a single pixel to he screen. So what these boards do is take a sprite, chop it up into lines, chop that line into pixels and send each pixel (I.E. blit) out to the monitor.
Okay. So, at 11:09 we see the jumbled test pattern. My Galaxian arcade keeps resetting from the test pattern to blank screen. Does that mean when it reaches the next test pattern "phase" that it is hitting a snag and not continuing? I found many of your videos super informative and very logical. Keep it up! Oh, and answer my question if you get the chance. :)
atarilogic 1 month ago
@atarilogic The game program is burned into the main ROMs on the PCB. Sounds like the CPU can access the test pattern portion of the program just fine but not the game portion. Simply reseating the ROMs may remedy this. If not.. it could be that you have a bad ROM.. or the circuitry that connects the CPU to the ROMs is messed up and will need to be repaired.
ajcrm125 1 month ago
Sponsored by Sharpie (TM)
lbaeza 3 months ago
Your videos are very informative. Thank you for all that you do!
HVC001 3 months ago
Blitted out to the screen????
Orthoshlep 8 months ago
@Orthoshlep Yeah. Blitting is the process of writing a single pixel to he screen. So what these boards do is take a sprite, chop it up into lines, chop that line into pixels and send each pixel (I.E. blit) out to the monitor.
ajcrm125 8 months ago
Top work, nice to see the Fluke 9010 in use.
Am not sure if it was just on the video but the game seems to be completely missing the "bullets".
WomblingFreely 1 year ago
Nice job!
Hellomat 1 year ago
What really freaks me out is since it was just the rom... MAME shows the same symptoms. Wow.
That was one of the original mask roms? That is fairly rare for one of those things to die.
sapbeast 1 year ago
I'll be damned...I was sure it was one of the RAM. Nice job!
APeale69 1 year ago