What's bochs?


Bochs - The cross platform IA-32 (x86) emulator

Updated: Sun Nov  2 08:45:00 CET 2014
Version: 2.6.7


WHAT IS BOCHS?


Bochs is a highly portable open source IA-32 (x86) PC emulator
written in C++, that runs on most popular platforms.  It includes
emulation of the Intel x86 CPU, common I/O devices, and a custom
BIOS. Bochs can be compiled to emulate many different x86 CPUs,
from early 386 to the most recent x86-64 Intel and AMD processors
which may even not reached the market yet. Bochs is capable of running
most Operating Systems inside the emulation, for example DOS,
Linux or Windows. Bochs was written by Kevin Lawton and is currently
maintained by the Bochs project at "http://bochs.sourceforge.net".


Bochs can be compiled and used in a variety of modes, some which are
still in development.  The 'typical' use of bochs is to provide
complete x86 PC emulation, including the x86 processor, hardware
devices, and memory.  This allows you to run OS's and software within
the emulator on your workstation, much like you have a machine
inside of a machine.  Bochs will allow you to run Windows
applications on a Solaris machine with X11, for example.


Bochs is distributed under the GNU LGPL. See LICENSE and COPYING for details.


GETTING CURRENT SOURCE CODE


Source code for Bochs is available from the Bochs home page at
http://bochs.sourceforge.net.  You can download the most recent
release, use SVN to get the latest sources, or grab a SVN
snapshot which is updated frequently. The releases contain the most
stable code, but if you want the very newest features try the
SVN version instead.


WHERE ARE THE DOCS?


The Bochs documentation is written in Docbook.  Docbook is a text
format that can be rendered to many popular browser formats such
as HTML, PDF, and Postscript.  Each binary release contains the
HTML rendering of the documentation.  Also, you can view the
latest documentation on the web at
  http://bochs.sf.net/doc/docbook/index.html


WHERE CAN I GET MORE INFORMATION?  HOW DO I REPORT PROBLEMS?


Both the documentation and the Bochs website have instructions on how
to join the bochs-developers mailing list, which is the primary
forum for discussion of Bochs.  The main page of the website also
has links to bug reports and feature requests.  You can browse and
add to the content in these areas even if you do not have a (free)
SourceForge account.  We need your feedback so that we know what
parts of Bochs to improve.


There is a patches section on the web site too, if you have made
some changes to Bochs that you want to share.


HOW CAN I HELP?


If you would like contribute to the Bochs project, a good first step
is to join the bochs-developers mailing list, and read the archive
of recent messages to see what's going on.


If you are a technical person (can follow hardware specs, can write
C/C++) take a look at the list of open bug reports and feature
requests to see if you are interested in working on any of the
problems that are mentioned in them.  If you check out the SVN
sources, make some changes, and create a patch, one of the
developers will be very happy to apply it for you.  Developers who
frequently submit patches, or who embark on major changes in the
source can get write access to SVN.  Be sure to communicate with the
bochs-developers list to avoid several people working on the same
thing without realizing it.


If you are a Bochs user, not a hardware/C++ guru, there are still
many ways you could help out.  For example:
  - write instructions on how to install a particular operating system
  - writing/cleaning up documentation
  - testing out Bochs on every imaginable operating system and

    reporting how it goes.




汉字字库存储芯片扩展实验 # 汉字字库存储芯片扩展实验 ## 实验目的 1. 了解汉字字库的存储原理和结构 2. 掌握存储芯片扩展技术 3. 学习如何通过硬件扩展实现大容量汉字字库存储 ## 实验原理 ### 汉字字库存储基础 - 汉字通常采用点阵方式存储(如16×16、24×24、32×32点阵) - 每个汉字需要占用32字节(16×16)到128字节(32×32)不等的存储空间 - 国标GB2312-80包含6763个汉字,需要较大存储容量 ### 存储芯片扩展方法 1. **位扩展**:增加数据总线宽度 2. **字扩展**:增加存储单元数量 3. **混合扩展**:同时进行位扩展和字扩展 ## 实验设备 - 单片机开发板(如STC89C52) - 存储芯片(如27C256、29C040等) - 逻辑门电路芯片(如74HC138、74HC373等) - 示波器、万用表等测试设备 - 连接线若干 ## 实验步骤 ### 1. 单芯片汉字存储实验 1. 连接27C256 EPROM芯片到单片机系统 2. 将16×16点阵汉字字库写入芯片 3. 编写程序读取并显示汉字 ### 2. 存储芯片字扩展实验 1. 使用地址译码器(如74HC138)扩展多片27C256 2. 将完整GB2312字库分布到各芯片中 3. 编写程序实现跨芯片汉字读取 ### 3. 存储芯片位扩展实验 1. 连接两片27C256实现16位数据总线扩展 2. 优化字库存储结构,提高读取速度 3. 测试并比较扩展前后的性能差异 ## 实验代码示例(单片机部分) ```c #include <reg52.h> #include <intrins.h> // 定义存储芯片控制引脚 sbit CE = P2^7; // 片选 sbit OE = P2^6; // 输出使能 sbit
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