Received a G80 (Astro Blaster) boardset from another KLOV user for repair today. Upon first inspection its booting to garbage although reset "looks" like its working.
Sure enough, probing reset at power up gives me a solid low for at least half a second then goes high. Clock signal is also good. A few data bus lines are driving higher than they should be.... Replace Z80a board now boots but game play but the screen is full of garbage.
Video board has some 4015's with broken pins. I've got more coming so I'll know more soon.
Will test I/O's tomorrow.
Sure enough, probing reset at power up gives me a solid low for at least half a second then goes high. Clock signal is also good. A few data bus lines are driving higher than they should be.... Replace Z80a board now boots but game play but the screen is full of garbage.
Video board has some 4015's with broken pins. I've got more coming so I'll know more soon.
Will test I/O's tomorrow.
