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95 lines
3.8 KiB
Markdown
95 lines
3.8 KiB
Markdown
# reinette II plus
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### reinette goes graphical !
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After [reinette](https://github.com/ArthurFerreira2/reinette) (Apple 1 emulator) and [reinette II](https://github.com/ArthurFerreira2/reinette-II) (the text only Apple II emulator), I am proud to release reinette II plus, a french\* Apple II plus emulator using SDL2.
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\* reinette has two meanings in french : it's a little frog but also a delicious kind of apple
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### Featuring :
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* all video modes in color
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* mono sound with mute/unmute
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* 48KB (no language card support)
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* paddles/joystic with trim ajustment
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* paste text from clipboard
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* disk ][ adapter with two drives (.nib files only)
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* drag and drop nib files to inset a floppy
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* save floppy changes back to host
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* zoom the window by integer increments
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It uses the same MOS 6502 CPU emulator as her sisters (now christened puce6502).\
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You only need SDL2 to compile it. (I'm not using SDL_Mixer, but only the native SDL2 audio functions)
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This emulator is not accurate in many ways and does not compete with
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[AppleWin](https://github.com/AppleWin/AppleWin), [Epple](https://github.com/cmosher01/Epple-II) or [LinApple](https://github.com/linappleii/linapple). Better use one of them if you want a better Apple ][ experience.
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I wrote it in the goal to better understand the Apple ][ internals, and I'm publishing the sources in the hope they will be of any help.
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It's compact, less 1000 SLOC, with two source files only, one for the CPU emulation, the other for the computer itself.
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I did my best to comment everything, and if you have an idea of how an Apple ][ works, it should be easy for you to understand the code, modify and enhance it for your needs (see TODO section).
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### Startup
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You can specify a .nib file on the command line to start the emulator with a floppy engaged in drive 1. Otherwhise, the emulator will start with no floppy (and thus wait one until you press the reset key or drag and drop a nib file)
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### Usage
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Drag and drop a disk image file (.nib format only) to inset it into drive 1\
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Drop the file while pressing the ALT key to insert it into drive 2
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Use the functions keys to control the emulator itself
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* F1 : writes the changes of the floppy in current drive back to host
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* F5 : zoom out down to 1:1
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* F6 : zoom in, no magnification limit
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* F7/F8 : adjust joystic trim
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* F9 : mute/unmute soud
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* F10 : reset
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* F11 : break
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* F12 : quit (you can also just close the window)
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Paddles / Joystic :
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* numpad 1 : left
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* numpad 3 : right
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* numpad 2 : down
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* numpad 3 : up
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* CTRL : button 0
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* ALT : button 1
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### limitations
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* High pitch noise at high volume (might be related with my environment)
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* Sound cracks when playing for long period (intro music for example)
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* CPU is not 100% cycle accurate - see source file for more details
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* Colors are approximate (taken from a scan of an old Beagle bros. poster)
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* HGR is inhacurate, and does not implement color clashing
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* disk ][ access is artificially accelerated
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* Only support .nib floppy images. (you can use [CiderPress](https://github.com/fadden/ciderpress) to convert your images to this format)
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* only has 48KB of RAM (can't run some software requiring the language card)
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* and many others ...
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### To do :
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* warn if you quit the application with unsaved floppy changes
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* give the user the option to switch to the original Apple II rom
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* colors where taken from an old Beagle Bros poster, find more accurate RGB values.
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* implement color clashing in HGR
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* optimize sound generation
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* optimize disk access (actually a bit artificial)
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* re-implement Paddles and Joystic support for a better analog simulation
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* implement a language card to extend the RAM of reinette II plus to 64K and support more sofware.
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*simplicity is the ultimate sophistication*
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