Hallo David, > Keep this connected in case you need it for ram refresh or a clock. Yes, but CLK2 is also used to enable buffers and to latch data. This could lead to unwanted latching or unwanted output. > > IMHO. Buffering of outgoing signals can be realized by a 541. > > The 244 can buffer.. Why are you using a latch? The 541 isn't a latch, but a buffer. The difference with the 244 is that the inputs are on pin 2-9 and the outputs on pin 11-18. An other difference is the way it is enabled. > However, if a cart-port device needs to DMA from/to the I/O region (i.e. the > cart slot), the data bus needs to be disconnected. So, the game and I/O > lines must disable the transciever so it doesnt step on the data. (this is > the challenge stated above) Is this a working solution? Looks good. > Unless you also tweaked the cart port for a single cycle, triggering ultimax > and disabling the ram/rom underneath ;) To be honnest, I'm not sure if I understood the explanation I got the last time. Is there a "UltiMax for dummies" available somewhere, please? Groetjes, Ruud http://Ruud.C64.org - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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