-  Upper Memory Blocks
Pocket8086 installs 128KB of memory in the D0000-EFFFF address segment and uses bit2 of IO port 060H as its switch flag. When it is written to 0, UMB is turned on (default). When it is written to 1, the UMB is turned off.

【 在 hgoldfish 的大作中提到: 】
: 我刚看了一下某电商平台上面的 pocket8086 电脑，安装了 640KB + 128KB 内存，使用的是 nec v30 处理器。
: 所以这里为啥要提供额外的 128KB 内存呢？
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FROM 71.198.4.*