Sounds like you need to disable the watchdog.. does the schematic show a diable to the watchdog circuit? In some cases I've had to desolder and raise a pin in the circuit to get it to stop barking. On 4/24/05, tony <tony@htbsusa.com> wrote:

i can not get the board to run at all it is stuck in a reset if i tie the hault and reset high i still can not get the 9010 to go past the first address something is sending a rest pulsing and the screen just flashes with garbage lines on it i pulled all roms and checked them in a programmer and tried swaping out the proms with ones on a known good board also swapped the cpu board with a know good one so i know the problem is in the cpu board and the video board is good i tried to bug trap all ttl 7400's in the reset circuit and replace any thing i found bad some 74ls116's is this a ram problem ? i am using a afterburner schematic i can not find the outrun one the cpu 1 should be on the outside right ? how can i get the fluke to run to get this fixed thanks tony

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Pulling the roms and testing them in a programmer is only part of the test. Now with those roms on your PC load up FIDE and get it to produce fluke rom signatures for them. Then put them back in the board and ensure that you can get your fluke to romcheck the roms in situ to the signatures that you produced. Once you can get to that stage then you know that not only the roms are good but also the buffers and any other ICs that make up the circuit in between the CPU and the roms is also good. By then you can start looking at ram and stuff... Martin. On Sunday 24 April 2005 19:28, tony wrote:

i can not get the board to run at all it is stuck in a reset if i tie the hault and reset high i still can not get the 9010 to go past the first address something is sending a rest pulsing and the screen just flashes with garbage lines on it i pulled all roms and checked them in a programmer and tried swaping out the proms with ones on a known good board also swapped the cpu board with a know good one so i know the problem is in the cpu board and the video board is good i tried to bug trap all ttl 7400's in the reset circuit and replace any thing i found bad some 74ls116's is this a ram problem ? i am using a afterburner schematic i can not find the outrun one the cpu 1 should be on the outside right ? how can i get the fluke to run to get this fixed thanks tony  

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