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- 2004-11-27
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- 1970-1-1
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发表于 2005-7-4 09:37:00
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处理器是一样的,部分i/o的内容也一样。引用一段话:
1. "Which key is pressed?" This is an address, usually somewhere in the first 256 addresses, which is always holding the value of the most recently pressed key on the keyboard.
2. Starting Address of RAM Screen Memory. This is the address in your computer where, if you POKEd something into it from BASIC, you would see the effect in the upper left-hand corner of your screen.
3. Print a Character. This address is within your BASIC ROM memory itself. It is part of the BASIC language, but written in ML. It is the starting address of a routine which will put a character on the screen.
4. Get a Character. Also part of BASIC in ROM memory, this ML routine accepts a character from the keyboard and stores it.
5. A safe place. You must know where, in your computer, you can construct ML programs without interfering with a BASIC program or anything else essential to the computer's normal operations. The best bet is often that memory space designed to serve the cassette player called the cassette buffer. While practicing, you won't be using the cassette player and that space will be left alone by the computer itself.
1相当于文曲星的$c7
2相当于部分机型的$19c0
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