mohawk640 Before you buy, do a search here for this user Donor 4 years: 2015, 2017-2019 VAPS Joined May 2, 2010 Messages 2,544 Reaction score 5 Location Chicago, Illinois May 26, 2016 #1
OP OP mohawk640 Before you buy, do a search here for this user Donor 4 years: 2015, 2017-2019 VAPS Joined May 2, 2010 Messages 2,544 Reaction score 5 Location Chicago, Illinois May 26, 2016 #2 Could this be ram issue
Joec2003 New member Joined May 8, 2012 Messages 88 Reaction score 3 Location Michigan May 26, 2016 #3 This might help http://www.brentradio.com/images/SpaceInvaders/midway_8080_tech.txt It describes how to test the ram near the bottom.
This might help http://www.brentradio.com/images/SpaceInvaders/midway_8080_tech.txt It describes how to test the ram near the bottom.
OP OP mohawk640 Before you buy, do a search here for this user Donor 4 years: 2015, 2017-2019 VAPS Joined May 2, 2010 Messages 2,544 Reaction score 5 Location Chicago, Illinois May 26, 2016 #4 Good info to have thanks
blinddog Well-known member VAPS Joined Jul 16, 2007 Messages 1,106 Reaction score 82 Location Lynnwood, Washington May 27, 2016 #5 What have you done so far? I'd first check to see if the CPU is working. Are the address lines changing states and do you see the lines on the display if you remove the ROMs? blinddog Last edited: May 27, 2016
What have you done so far? I'd first check to see if the CPU is working. Are the address lines changing states and do you see the lines on the display if you remove the ROMs? blinddog
OP OP mohawk640 Before you buy, do a search here for this user Donor 4 years: 2015, 2017-2019 VAPS Joined May 2, 2010 Messages 2,544 Reaction score 5 Location Chicago, Illinois May 27, 2016 #6 Ill plug the rom and turn it on and see what happens
OP OP mohawk640 Before you buy, do a search here for this user Donor 4 years: 2015, 2017-2019 VAPS Joined May 2, 2010 Messages 2,544 Reaction score 5 Location Chicago, Illinois Jun 3, 2016 #7 I changed the cpu and it fix the problem now I need to redo the button with the swicths now .