This works as you would expect: every iteration of the loop, the entire row is erased and a new version of the ASCII bar is drawn.
In our initial program, there are only two interrupts per frame: one mid-screen to prepare for drawing the board and status line, and one at the bottom to reset the display for the logo next frame. This meant that the interrupt handler could decide what to do simply by checking the current scanline as reported by the $D012 register; if the value was over 127, do the end-of-frame work, and otherwise do the mid-frame work. That simple test required only a single instruction, and while the exact value of $D012 might vary, the test was broad enough that it didn’t have to worry about it.
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"It was never really pushed or promoted, or advertised much. It was the fans who discovered it and then talked to each other about it."
In MS-DOS 2.11, there is a new INT 21h function called AllocOper (58h). It allows the caller to set or get the memory allocation strategy. The available options are usually referred to as “first fit” (0, the default value), “best fit” (1), and “last fit” (2).，详情可参考体育直播
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func (*Option) ArgInt32Var ¶