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50 lines
2.0 KiB
Markdown
50 lines
2.0 KiB
Markdown
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# epple2, The Emulated Apple ][
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Copyright © 2008–2019, Christopher Alan Mosher, Shelton, Connecticut, USA, <cmosher01@gmail.com>.
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[](https://www.gnu.org/licenses/gpl.html)
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[](https://github.com/cmosher01/Epple-II/releases/latest)
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[](https://travis-ci.com/cmosher01/Epple-II)
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[](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=CVSSQ2BWDCKQ2)
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Home page: <https://mosher.mine.nu/epple2>
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`epple2` is an emulator of the **Apple ][** and **Apple ][ plus**
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computers from Apple, Inc.
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---
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The fundamental principle of `epple2` is to accurately and faithfully
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emulate the behavior of the original Apple ][ machines, including the
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internal workings, as much as practical.
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Features of the emulation include:
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* individual cycles of the 6502 CPU
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* NTSC video signal generation
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* displaying the *strange orange line*
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* other display color anomalies
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* floating data bus
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* Disk ][ Logic State Sequencer
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* read copy-protected disks
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* read/write half- and quarter-tracks
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* configurable RAM chips
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* cassette tape interface
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The CPU and video timings are synchronized, and the emulator
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is designed to run at the same speed as the original
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machine (about 1MHz). It also emulates a television screen,
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and color and monochrome monitors, for the display.
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It includes emulation of the **Disk ][** controller card,
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the ROM firmware card, and the RAM Language Card, as well
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as a simple clock card.
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The primary source for information about the internals of the
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Apple ][ is *Understanding the Apple ][*, by Jim Sather.
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`epple2` is written in C++, and is designed to be buildable
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on Linux, Mac, or Windows (mingw).
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[SDL](http://www.libsdl.org/) is the only dependency.
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See files `COPYING.*` for other copyright notices.
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