Level42
New member
OK, I'm really stuck now.
I've so far installed 2 SW/ESB kits on two board sets without any problems at all. Both are still working beautifully after about a year.
Now, the third is giving me serious headaches.
When I installed it the first time, it was constantly resetting. When I switched it to test-mode there was an error at ROM 1F. Pretty logical, as you have to remove all the original ROMs and the kit get's inserted at ROM 1F (as well as to the CPU and NOVRAM sockets).
Since then I've tried everything to find the problem. I've installed the same kit on my spare PCB set (which is not in the best physical condition, but works) and it worked fine.
So you'd think it would be a board problem on the original set BUT that one is working fine as long as I use it in factory original set-up.
So if the PCB is working fine without the kit, and if the kit works fine on another PCB, where could the problem be ?
I figured it might be the sockets. So I replaced the CPU, NOVRAM end 1F EPROM sockets, but the result is still the same ROM error at 1F.
(Does anybody know what the extra letters behind the error message indicate by the way, the documentation seems to not mention it. Looks like an address ?)
So, now I'm lost. I measured all adress and data lines from the buffers to the CPU and to the EPROM socket, check outed the buffers themselves (compared to my spare board) and everything seems OK.
Could it be that the kit has some more requirements for certain levels and that f.i. the buffers are managing the normal EPROMs but not the kit ?
Any help very welcome !!
I've so far installed 2 SW/ESB kits on two board sets without any problems at all. Both are still working beautifully after about a year.
Now, the third is giving me serious headaches.
When I installed it the first time, it was constantly resetting. When I switched it to test-mode there was an error at ROM 1F. Pretty logical, as you have to remove all the original ROMs and the kit get's inserted at ROM 1F (as well as to the CPU and NOVRAM sockets).
Since then I've tried everything to find the problem. I've installed the same kit on my spare PCB set (which is not in the best physical condition, but works) and it worked fine.
So you'd think it would be a board problem on the original set BUT that one is working fine as long as I use it in factory original set-up.
So if the PCB is working fine without the kit, and if the kit works fine on another PCB, where could the problem be ?
I figured it might be the sockets. So I replaced the CPU, NOVRAM end 1F EPROM sockets, but the result is still the same ROM error at 1F.
(Does anybody know what the extra letters behind the error message indicate by the way, the documentation seems to not mention it. Looks like an address ?)
So, now I'm lost. I measured all adress and data lines from the buffers to the CPU and to the EPROM socket, check outed the buffers themselves (compared to my spare board) and everything seems OK.
Could it be that the kit has some more requirements for certain levels and that f.i. the buffers are managing the normal EPROMs but not the kit ?
Any help very welcome !!