After a BASIC programming class in HS, I got an Apple IIGS and started writing. 6-channel Mockingboard sound card emulation, including the ability to record and play back music, and write your own with a built-in six. But microM8 is also a solid Apple II emulator with all the common features you would expect, such as: Full-screen and windowed modes rendered in high-definition using OpenGL in LED, raster and 3D voxel styles.Running MacOS 9 requires a supported Power PC based. MacOS 9 was abandoned in favor of of the Unix-ish NextStep/Openstep based Mac OS X. Like previous version, it lacks true protected memory or pre-emptive multitasking. Mac OS 9.x, based on Mac OS 8 was the final product based on the classic MacOS architecture.It was sold several million times from April 1977 till 1993. It gives you an impression of using the iOS so that you can see and feel the difference between Android and the iOS.The Apple ][ personal computer was one of the first three completely assembled systems on the market. IPadian is a simulator, not an emulator. IPadian is one of the most popular and best iOS simulators, making it possible to get the iPad experience on your Windows or Mac computer. Press : See the Hackaday article »Portable Apple II On An AVR« featuring this project.Apple - II Series emulators on Windows and other platforms, free Apple - II Series emulator Agat Emulator is an Apple II and Agat 7/9 (Soviet clones) emulator.Its GUI uses the Russian language.1.
![]() Apple Ii Emulator Norom Software Design OfThe thesis describes the MOS 6502 architecture, the development of a fast emulation of it and the hardware and software design of other parts of the handheld unit in glorious detail. Enjoy it!If you are interested in the topic and my thesis you can download the complete PDF file in the following. It shows the final (third) prototype in action and demonstrates most of it's features. Dropbox for mac os x 105832 and following) and analyzed why they are not fast enough. At the beginning of chapter three different approaches to emulate the MOS 6502 processor are presented (p. 27) compares the Von Neumann architecture (used by almost every modern computer and by the Apple ][) against the Harvard architecture (used by the used microcontroller). Section ✲.3 Different architectures« (p. 12) explains the principle of operation of the famous 6502 processor and especially the section about the addressing modes explains the different modes very extensively. Section ✲.1.1 MOS Technology 6502« (p. It finally also answers the initial question whether it is possible to emulate an 8-bit computer system on an 8-bit microcontroller with only a slightly higher system clock (see p. The thesis is concluded with chapter five taking a look at the initial requirements and the results. 59) to let the emulator later load software from floppy disk images. 54 or figures below) and structure of Apple floppy images is presented (see figure seven, p. Later, in chapter three, the structure of the entire firmware of the final handheld emulator is presented (see figure six, p. 44 - 52) presents the solution which is to implement the MOS 6502 processor emulation directly in AVR assembler and utilize the status register of the AVR processor to set the status flags of the emulated processor since it turned out that calculating the status flags in high level languages (or generally in software) takes a huge effort which causes the slowdown. This section only gives some meta information since everything about the emulator is obviously written down in the thesis.Initially I planned to create a portable NES console (by emulating the 6502 processor on an AVR) for my thesis since my supervisor teaches a course where he builds a DIY, self-developed game console (by him) with the students based on an ATMega 1284p. I created the schematic using CADSoft's Eagle.Download the schematic (PDF file, 97 KB) SHA-1 facdf8265d150fc5ce796bb9fd16ad89a2c31383If you want to link to this document you can download an »advertising« image here.If you are interested in how I developed, created and build the portable Apple ][ emulator you might want to take a look at the complete thesis which can be downloaded in the section Documents above. Despite the fact that it is mostly in German it might be worth to take a look at since the keynote gives a short (visual) overview about what I did.Download the full keynote (PDF file, 8.3 MB) SHA-1 bf95f44947552ac241673e02d29fa3826a43a95bYou can also download the full schematic for the Apple ][ emulator developed during my thesis. In the following a short explanation of every module is given: All other modules - with except to the gray modules (SD library, C compiler and hardware) - have been developed completely from scratch over the course of my thesis by myself. The following figure shows the layer diagram of the different modules of the emulator.Layer diagram of the Apple ][ emulator: every horizontal connection of two boxes symbolizes a »use« relation.The green module is the AVR assembler source code of the CPU emulation. The emulation of the MOS 6502 makes only a little part of the around 9.000 lines of code (LOC). The goal of a portable unit seemed reachable with it.The final product is - as you can see in the 360° view at the top - is a real portable device. Keyboard I/O - Accepts key presses from the separate keyboard controller (since the key matrix scanning needs too much resources to be integrated into the main controller) and provides some high-level functions to convert Apple ][ keystrokes into regular ASCII keycodes and some wait-for-keypress functions. UI Framework / Display I/O - Some low level functions to control the LCD display (SSD 1289 controller) and functions to paint menus and backgrounds - just like the display TUI tool on Linux. For example the menu which lets the user choose a program to load into the Apple ][ disk image files. DSK I/O - Contains all high-level functions to read Apple ][ is the original version and lacks floppy disk support. Two functions which utilize the AVR's hardware support for I2C to talk to the 128KB I2C serial EEPROM from Microchip. TWI / EEPROM - Provides physical layer support to talk to an EEPROM, e.g. This module provides functions to help saving and loading the emulator state and relies on the module TWI / EEPROM which provides the physical layer support. Therefore the execution can be saved and reloaded later to continue at the exact same execution state. This reduces the component count, saves cost and makes everything less complex. This would allow for more states to save on the one hand and allow to eliminate the EEPROM and circuitry on the other hand. A further improvement could be to store states to the SD card. SD Library (3rd party) - The emulator uses the Petit FAT File System Module by Elm Chan since it worked out of the box. See also the section about future development here. Since the emulation software needs some SRAM for variables and data only 12KB remain for the emulated Apple ][. Implemented in AVR assembler using directly AVR instructions for speedup when possible.The used ATMega 1284p has a total of 16KB physical SRAM. 6502 CPU Emulation - Advanced emulation of the MOS 6502 processor without support for illegal instructions (not originally defined) and the BCD mode.
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