Chris

One of the battery wires was corroded where it enters. Fortunately, the resin melts when heated, and I was able to solder it to the nub of remaining wire.Measuring the resistance between + & - shows a high but measurable amount showing it's actually soldered. It holds the key ok.

Finally built my FD1089/FD1094 programmer so I can test an idea out. Grabbed my box of maybe "dead" FD1094 and used the verify function. Amazingly,8 out of 12 still verify as having valid security sram, held for nearly 40 years.Except for my "good" Golden Axe cpu with a bad byte.

@RepArcade What varnish do you use?

1/2 #Réparation d'une carte mère #Sega System 16 qui freeze ou redémarre de façon intempestive. L'inspection visuelle révèle une belle coupure de continuité côté soudures ! Réparation des pistes, vernissage. ... Mais ce n'est pas l'origine de la panne.

@MuseumCommodore The game I always go back to is Fort Apocalypse. Not massive but fun to play for 10 minutes. Plexor lives here!!!

@commodorec64 Great for coding as you don't need to remember the parameter passing registers but a nightmare to reverse engineer (I'm looking at you 8 bit encrypted Capcom and Sega arcade games)

I really enjoy working with inline arguments... #c64 #Assembly #mos6502 #mos6510

@wickerwaka Maybe they needed the extra speed. More likely it was an easy way to add protection with their existing tools.

Traced out the audio parts of the M92 B board today. It's surprising how underutilized the V35S is. IREM could probably could have kept the Z80 from the M72. Maybe they found it appealing to be able to use the same instruction set (and tools) as the main CPU.

@paulhamx Take care of yourself and family. You guys got hit hard by Gabriel. We didn't get hit bad in Hamilton although the stream running through my property was the highest I've seen it.

Hmmm. Looks like I may to get back to #pico8 for a week or 2. Hawkes bay completely cut of and no power due to Cyclone Gabrielle. Family all good and have food so that’s the priority 😁

@TheMikeDX Love the flick animation just like the (retro) real thing

I made a thing. Real time mini departure board #M5Stack core2 esp32 unit using the api from nationalrail. #trains #maker

@CorradoTomasel1 Actually it looks like just the second line in every chip marking was scratched

@Jun0Man Funny they erased the date code 😂😂

IREM used 'security by obscurity' on Moon Patrol except the Dremel erased the wrong text. A 74ls275 Wallace Tree multiplier which unfortunately had the same IO pins as a 512x4 bprom making duplicating the function easy for bootleggers. http:/en.wikipedia.org/Wallace_tree

@CorradoTomasel1 I would think the low paid workers who manufactured the pcbs in Japan didn't read English so just scratched a random part of the TTL

@topapate I think bipolar proms were considerably more expensive in 1976. You can parallel them to do 64x64 bit multiplies according to the datasheet shop.griederbauteile.ch/en/info/7/74S2…

@Jun0Man The multiplier may have been a ROM too then

@MartinPiper Saving that image as its handy when you can't remember what the acronyms look like (and haven't acquired a pcb ruler yet. Lol)

Which ones are you using most often these days?

Original IREM Moon Patrol had a glitch on the middle scroll layer.Changed 2 74ls283@4f&4h which improved it.Touching pin 1 of 4h made the glitch change.C68 is missing from Irem boards & manually added by Williams.Probably due to diffrnt 2732a timing. It should be across 1 and 14

@_ShootTheCore @_atrac17 @wickerwaka @topapate That is such a great idea for powering a logic probe.

@_atrac17 @wickerwaka @topapate I could really use those schematics! 😅

I'm really excited to see Gunforce!!! Thanks a ton for your work @wickerwaka on the M92 platform. I believe @topapate plans on doing the full schematics for this title and 'In The Hunt' this month for preservation. Those should come in handy for the future!

Fujitsu sux. Repair bootleg moon patrol pcb by replacing bad Fujitsu chips. Take video of it working. Leave burning in for 2 hours. Loose sprite and middle parallax layer. Replace more Fujitsu. Rinse and repeat. Or just shotgun all the Fujitsu chips with the same date codes?

@CodingAndThings Don't forget the recent weird sheet lightning storms and hail in what is considered summer. WTF is going on.

RIP Archer Maclean. Such an interesting dude and a fellow arcade lover and fixer. Its a shame our paths didn't cross more often. I'll have a play of Dropzone and IK+ to remember him.

@csonesz003 No, I never found a wiring diagram. It would be a massive help if you found a manual

@Jun0Man Hey @Jun0Man ! Luckily I found a copy of this junky stuff. Do you have already a wiring diagram for that to be able to play this lovely piece of history?

Operation Tiger by Taito. Just need a wiring diagram to see if it works (or figure it out)

@_ShootTheCore Make sure you have the correct conversion romset (see post #27 here arcade-projects.com/threads/moonwa… ). I've done the conversion and I didn't need any wire mods

Sega System 18 #arcade repair update. After using the self-diag to track down 3 bad TTLs, 7 bad SRAM chips & reflowing the custom in the corner, Mr. Jackson almost looks the way he’s supposed to. Now the diag passes all tests-no more hints on clearing this last problem up. 😅