94 lines
2.4 KiB
Markdown
94 lines
2.4 KiB
Markdown
# Apple // emulator in go
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An Apple //e emulator written in Go using [ebiten](https://github.com/hajimehoshi/ebiten).
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## Features
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* MOS 6502 CPU
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* Keyboard
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* 40 column text mode
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* Low resolution monochrome and color graphics
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* High resolution monochrome and color graphics
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* Upper memory bank switching: $d000 page and ROM/RAM
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* Main memory page1/page2 switching in text, lores and hires
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* Disk image reading & writing
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* Speaker audio
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## Installation
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The installation requires go modules go be installed
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Build the executable
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go build
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Download `apple2e.rom` from
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[a2go.applearchives.com](http://a2go.applearchives.com/roms/) and put it in the root directory.
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## Running it
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./apple2-go
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./apple2-go my_disk_image.dsk
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./apple2-go -drive-head-click my_disk_image.dsk
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## Keyboard shortcuts
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* ctrl-alt-R reset
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* ctrl-alt-M toggle monochrome/color display
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* ctrl-alt-C caps lock
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* ctrl-alt-F show FPS
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## Running the tests
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### Setup
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The tests use DOS and Prodos disk images. Download them from
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* dos33.dsk from [mirrors.apple2.org.za](https://mirrors.apple2.org.za/ftp.apple.asimov.net/images/masters/DOS33_blank_with_integer_basic.DSK)
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* prodos19.dsk from [mirrors.apple2.org.za](https://mirrors.apple2.org.za/ftp.apple.asimov.net/images/masters/prodos/ProDOS_1_9.dsk)
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### Running the tests
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go test -v
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The CPU tests make use of [Klaus2m5's](https://github.com/Klaus2m5/6502_65C02_functional_tests)
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excellent 6502 functional tests.
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### Creating the CPU test ROMs
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The source files are `6502_functional_test.a65` and `6502_interrupt_test.a65`. They are assembled using `as65` into a binary file which contains a memory image of the test code. They are compressed into gzip files which are loaded into the apple memory by the unit tests.
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Download [as65](http://www.kingswood-consulting.co.uk/assemblers/as65_142.zip) and unzip it to get the `as65` assembler binary.
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Assemble the tests
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cd cpu
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as65 -l -m -w -h0 6502_functional_test.a65
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gzip 6502_functional_test.bin
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as65 -l -m -w -h0 6502_interrupt_test.a65
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gzip 6502_interrupt_test.bin
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## Known working disk images
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* DOS 3.3
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* Prodos 1.9
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* Lemonade stand
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* Montezuma's Revenge
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## Remaining work
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* 80 column card
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* 48k aux memory
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* double hires
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* joystick
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## Coding standards
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Use `gofmt` to ensure standard go style consistency
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go fmt $(go list ./... | grep -v /vendor/)
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Use `golint` to ensure Google's style consistency
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golint $(go list ./...)
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