On 05/26/2013 09:59 PM, Michał Pleban wrote: > Hello! > > Today I noticed something strange with the KERNAL /CS line of the C64. > > Normally this line should go low only when KERNAL is accessed. But I am > seeing very short low pulses (about 50ns) at the beginning of many clock > cycles. > > These pulses mess up with my Flash handling circuit so I need to get rid > of them. I thought of a simple RC filter for this purpose, but my first > question is why they occur at all? Is that some artifact which happens > when the VIC handles the bus back to the CPU? There is no such > phenomenon on respective CS lines of BASIC and CHAROM. You should look again. Especially the _CS line for the Char-ROM does have many strange things happen on it. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2013-05-27 15:00:04
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