Hallo Michał, > But probably the address is visible on the address bus everywhere? Yes, even it is an I/O operation or a ROM access, the multiplexed addresses are fed to the 6509 board. In short: RAS is either generated by a memory read or write, or by circuit where OSC and CLK are involved (refresh?). And now the weird thing: if RAS is generated, CAS is generated as well! Thus even if the RAS has been generated by the refresh circuit. And as reading the ROM is a memory access as well, even then RAS and CAS are generated. -- ___ / __|__ / / |_/ Groetjes, Ruud Baltissen \ \__|_\ \___| http://Ruud.C64.org Message was sent through the cbm-hackers mailing listReceived on 2011-01-28 20:00:14
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