On 5/23/2018 4:55 AM, smf wrote: > On 23/05/2018 00:41, Jim Brain wrote: > >> I guess it depends on what one defines as a "hack". This unit simply >> engages the GAME line anytime a memory access that should be outside >> the C64 is requested. I think that is standard behavior. > > I don't believe you were supposed to change GAME & EXROM dynamically, > although a handful of projects do for better or worse. Ah, then I am a hack, in the grand spirit of hacks :-) > > When aren't you asserting GAME? _game is asserted: * PHI2 is HIGH AND * Address[15:12] != 0 AND * Address[15:12] != D AND * the current PAGE!= 0 PAGE is an 8 bit (soon to be 16 bit) value denoting which 4kB page is mapped into the selected page of main system RAM. -- Jim Brain brain@jbrain.com www.jbrain.comReceived on 2018-05-23 19:00:07
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