Recent content by makedome

hello, I gave up to repair it but meanwhile I found that it could depend on the level of sync signal. I found I put a 10k resistor on the sync wire I forgot to stabilize the rgb converter signal. Now I put a potenziometer and i regulate according to each board. I should take it back and check again

adding the picture of the pcb

hello, if someone has this bootleg can please send me the dump of the gal above the z80 cpu? thanks

hello, I'm working on a gaelco world rally that has some grafic issues with words and objects. If someone has worked already on this pcb please can give me some hints to find the ic or the area of the pcb that is possibly broken. Since some rams have been replaced and I see on the other working...

Hello, I'm repairing this golden axe bootleg. Initially characters sprites were missing so after reflashilng almost all roms(no stickers) I replaced the broken74hc138, the ls298 which was broken and the resistor missing and now the characters are missing but removing the ls189 they reappear...

Hello, searching for those. Please shout out if you hear something about. Thanks

hello, I'm repairing this bootleg wonder boy 3 which has a sync issue (image is slowly rolling vertically and also slightly shifted to the right with a portion that returns to the left) and missing audio. For those who are going to suggest to trim the monitor I already did and that's the best...

Hello, I'm searching for it. Even to be tested. Thanks makedome

hello, I'm searching for one of those pcbs, even not working: Rad Mobile, F1 Exhaust Note,Rad Rally,Spider-Man: The Video Game, Air Rescue,Arabian Fight,Dark Edge,F1 Super Lap, Outrunners, stadium cross, Title Fight Hard Dunk Thanks

hello, as for reset signal of the z80 it does turns from low to high at startup. I also discovered that the pcb starts with the mb8464a ram removed and the test is obviously saying that chip is bad. So as you said the test is not able to communicate with ram. Now the question is how it does...

all right ok, got it. so eprom looks good because as I wrote ce is low and oe is toggling the clock on z80 id toggling and I have to verify reset on power on Ok, I'll keep you updated Thanks for now

Hello, I'm trying to repair an Outrunners pcb that has no sound: The test reports ic21 bad: it's the mb8464, the ram next to z80. I tried to replace it with another one but no change. The other things I checked so far: - the amplifier works fine, - the z80 address and data lines are toggling...

hello ekorz, maybe I cannot find the information that I was searching for you the mame libraries or you didn't get my request. I need some informations related to how the pcbs works for example to draw the vertical/orizontal sync lines, to read the controllers, the audio... Are those information...

Good morning, do you know where can I find information about jamma pcbs architecture blocks? I'm searching something dealing not about single components like cpus, rams, roms ,,,,but something describing the different blocks that make those boards work. Thanks makedome

Hello, I'm trying to program those eproms with this programmer version 5.0e but I'm receiving error after writing phase during verification. I checked the voltage on pin 1-16 and I have 12 for 2764 and 21 for 2532. What am I doing wrong? Thanks makedome