elfyhead
New member
two questions on a q*bert restoration:
1 - i can't seem to get the high score fix to work. i'm using one of the Arcade Shop replacement power supplies, and have replaced C25 with a 470 uF, and have put in 2 STMicroelectronics m48z02 zeropower RAMs and taken out the diode at D2 and replaced it with a jumper. still no love. i'm sure the power supply is OK, as i've got another CPU board that works fine (saves high scores even with no fixes at all - all original parts!). the power on pin 40 of the 8088 is at 5.05 V, so that's not the problem. where should i check next?
2 - the knocker isn't working (i know, big surprise!). when i bought the beast, it had a burned out 2N6044 at Q2, so i figured that was the problem, but when i replaced that transistor, it just burned right through the new one as well (making my wife not very happy about the smell coming from the garage
. the fuse is intact; can the solenoid itself be shorted, but not trip the fuse? oh, and i've re-capped the sound board, if that matters, though the sound has been fine from when i bought it.
thanks in advance for any help!
1 - i can't seem to get the high score fix to work. i'm using one of the Arcade Shop replacement power supplies, and have replaced C25 with a 470 uF, and have put in 2 STMicroelectronics m48z02 zeropower RAMs and taken out the diode at D2 and replaced it with a jumper. still no love. i'm sure the power supply is OK, as i've got another CPU board that works fine (saves high scores even with no fixes at all - all original parts!). the power on pin 40 of the 8088 is at 5.05 V, so that's not the problem. where should i check next?
2 - the knocker isn't working (i know, big surprise!). when i bought the beast, it had a burned out 2N6044 at Q2, so i figured that was the problem, but when i replaced that transistor, it just burned right through the new one as well (making my wife not very happy about the smell coming from the garage
thanks in advance for any help!