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113 lines
4.9 KiB
Markdown
113 lines
4.9 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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[download windows binaries](https://github.com/ArthurFerreira2/reinette-II-plus/releases/tag/0.4)
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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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* 64KB (language card support)
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* paddles/joystick with trim adjustment
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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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* screen scaling by integer increments
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* easy screenshot
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It uses an optimized and accurate MOS 6502 CPU emulator (now christened [puce6502](https://github.com/ArthurFerreira2/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 good Apple ][ emulation experience.
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I wrote it with 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, 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 the code, 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 at the command line to start the emulator with a floppy engaged in drive 1. Otherwise, the emulator will start with no floppy (and thus waits 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 insert it into drive 1\
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**reinette II plus** will reboot immediately and try to boot the floppy.\
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Press CTRL while dropping the file if you don't want the emulator to reboot \
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Pressing the ALT key while dropping the file inserts it into drive 2.
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Use the functions keys to control the emulator itself :
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```
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* F1 : display save how to
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* ctrl F1 : writes the changes of the floppy in drive 0 back to host
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* alt F1 : writes the changes of the floppy in drive 1 back to host
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* F2 : save a screenshot into the screenshots directory
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* F3 : paste text from clipboard
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* F4 : mute / unmute sound
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* shift F4 : increase volume
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* ctrl F4 : decrease volume
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* F5 : reset joystick release speed,
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* shift F5 : increase joystick release speed
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* crtl F5 : decrease joystick release speed,
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* F6 : reset joystick action speed,
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* shift F6 : increase joystick action speed
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* crtl F6 : decrease joystick action speed,
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* F7 : reset the zoom to 2:1
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* shift F7 : increase zoom up to 8:1 max
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* ctrl F7 : decrease zoom down to 1:1 pixels
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* F10 : pause / un-pause the emulator
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* F11 : reset
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* F12 : about, help
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Paddles / Joystick :
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* numpad 1 : left
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* numpad 3 : right
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* numpad 5 : up
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* numpad 2 : down
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* CTRL : button 0
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* ALT : button 1
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* SHIFT : button 2 (allow applications to use the shift mod)
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```
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### Limitations
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* ~~high pitch noise at high volume on windows (Linux Ubuntu tested OK)~~
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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 video is inaccurate, and does not implement color fringing~~
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* ~~disk ][ access is artificially accelerated~~ - considered as a feature
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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 software requiring the language card)~~
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* and many others ...
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### To do
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* ~~fix sound cracks~~
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* give a warning if the application exits with unsaved floppy changes
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* check for more accurate RGB values.
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* ~~implement color fringe effect in HGR~~
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* ~~re-implement Paddles and Joystick support for analog simulation~~
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* ~~implement the language card and extend the RAM of **reinette II plus** to 64K to support more software.~~
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* for 6502 coders :
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* add the ability to insert a binary file at a specified address
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* give the user the option to start with the original Apple II rom
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* dump regs, soft switches and specified memory pages to console
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\
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\
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\
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*simplicity is the ultimate sophistication*
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