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I know this isn't atari specific, but I'm sure there are people here who can give me an answer...
I had this question in an exam:
"A UART chip, to be used in a small 8 bit computer system without address decoding, has two address lines and 6 chip select lines. If the computer system uses 16 bit addressing, how many times will the UART appear in the memory map?"
(The 8bit chip is a motorola obviously, despite the UART being used as opposed to an ACIA, otherwise it wouldn't be in the memory map)
I answered 1024, but the answer was 256. I insist that I'm right!
The way I see it, the 6 chip selects on the UART will respond to 1 of 64 combinations. So on the one occasion of the 64 when the UART responds, it won't matter WHAT the last 10 bits are, the chip will be selected and will respond to the address. 10 bits is 1024 addresses, isn't it?
Some one explain it to me :o)
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