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Updates for 0.9.9
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Seth Morabito
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README.md
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README.md
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@ -3,15 +3,16 @@ SYMON - A 6502 System Simulator
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**NOTE: THIS SOFTWARE IS UNDER ACTIVE DEVELOPMENT. Feedback is welcome!**
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**Version:** 0.9.1.0
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**Version:** 0.9.9.0
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**Last Updated:** 29 December, 2013
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**Last Updated:** 26 July, 2014
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Copyright (c) 2013 Seth J. Morabito <web@loomcom.com>
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Copyright (c) 2014 Seth J. Morabito <web@loomcom.com>
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Portions Copyright (c) 2014 Maik Marten <maikmarten@googlemail.com>
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See the file COPYING for license.
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![Symon Simulator in Action] (https://github.com/sethm/symon/raw/master/screenshots/full.jpg)
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## 1.0 About
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@ -22,7 +23,8 @@ in Java. Its core goals are accuracy, ease of development, clear
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documentation, and extensive test suites for validating correctness.
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Symon simulates a complete system with a 1 MHz NMOS 6502, 32KB of RAM,
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16KB of ROM, a 6551 ACIA, a 6522 VIA, and a 6545 CRTC.
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16KB of ROM, a MOS 6551 or Motorola 6850 ACIA, a MOS 6522 VIA, and an
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experimental 6545 CRTC.
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Symon has extensive unit tests to verify correctness, and fully passes
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Klaus Dormann's 6502 Functional Test Suite as of version 0.8.2
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@ -31,21 +33,33 @@ for more information about this functional test suite).
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## 2.0 Requirements
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- Java 1.5 or higher
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- Java 1.7 or higher
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- Maven 2.0.x or higher (for building from source)
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- JUnit 4 or higher (for testing)
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## 3.0 Features
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### 3.1 Memory Map
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Symon can simiulate multiple 6502 based architectures. At present, two
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machines are implemented: Symon (the default), and MULTICOMP.
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### 3.1 Memory Maps
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#### 3.1.1 Symon Memory Map
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- `$0000`--`$7FFF`: 32KB RAM
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- `$8000`--`$800F`: 6522 VIA
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- `$8800`--`$8803`: 6551 ACIA (Serial Console)
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- `$9000`--`$9001`: 6545 CRTC
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- `$8800`--`$8803`: MOS 6551 ACIA (Serial Console)
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- `$9000`--`$9001`: MOS 6545 CRTC
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- `$C000`--`$FFFF`: 16KB ROM
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The CRT Controller uses memory address `$7000` as the start of Video memory.
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The CRT Controller uses memory address `$7000` as the start of Video
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memory.
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#### 3.1.2 MULTICOMP Memory Map
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- `$0000`--`$DFFF`: 56KB RAM
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- `$E000`--`$FFFF`: 8KB ROM
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- `$FFD0`--`$FFD1`: Motorola 6850 ACIA
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### 3.2 Serial Console and CPU Status
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@ -53,10 +67,9 @@ The CRT Controller uses memory address `$7000` as the start of Video memory.
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The main window of the simulator acts as the primary Input/Output
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system through a virtual serial terminal. The terminal is attached to
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a simulated MOS 6551 ACIA, including a programmable baud rate
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generator that tries to approximate the correct "feel" of the
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programmed baud rate. (The sample Enhanced BASIC ROM image is
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programmed for 9600 baud)
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a simulated ACIA, including a programmable baud rate generator that
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tries to approximate the correct "feel" of the programmed baud rate.
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(The sample Enhanced BASIC ROM image is programmed for 9600 baud)
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It also provides CPU status. Contents of the accumulator, index
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registers, processor status flags, disassembly of the instruction
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@ -66,13 +79,16 @@ register, and stack pointer are all displayed.
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The console supports font sizes from 10 to 20 points.
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### 3.3 16 KB ROM Loading
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### 3.3 ROM Loading
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![ROM Loading] (https://github.com/sethm/symon/raw/master/screenshots/load_rom.png)
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Symon can load any 16 KB (16384 bytes) ROM image from the "File"
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menu. The selected ROM will be placed in memory from locations `$C000`
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to `$FFFF`
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Symon can load any appropriately sized ROM image. The Symon
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architecture expects as 16KB (16384 byte) ROM image, while the
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MULTICOMP architecture expects an 8KB (8192 byte) ROM image. Images
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are loaded via the "Load ROM..." action in the "File" menu. The
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selected ROM file will be loaded into memory at the correct ROM base
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address.
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### 3.4 Memory Window
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@ -161,17 +177,22 @@ interface.
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### 4.2 ROM images
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The simulator requires a 16KB ROM image loaded at address `$C000` to `$FFFF` to
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work properly. Without a ROM in memory, the simulator will not be able to
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reset, since the reset vector for the 6502 is located in this address space.
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The simulator requires a ROM image loaded into memory to work
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properly. Without a ROM in memory, the simulator will not be able to
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reset, since the reset vector for the 6502 is located in the ROM
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address space.
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By default, any 16KB file named `rom.bin` that exists in the same directory
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where Symon is launched will be loaded as a ROM image. ROM images can also
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be swapped out at run-time with the "Load ROM Image..." in the File menu.
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By default, any file named `rom.bin` that exists in the same directory
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where Symon is launched will be loaded as a ROM image. ROM images can
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also be swapped out at run-time with the "Load ROM Image..." in the
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File menu.
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The "samples" directory contains a ROM image named 'ehbasic.rom', containing
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Lee Davison's Enhanced 6502 BASIC. This serves as a good starting point for
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exploration.
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The "samples" directory contains a ROM image for the Symon
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architecture named 'ehbasic.rom', containing Lee Davison's Enhanced
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6502 BASIC. This serves as a good starting point for exploration.
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*Note*: Presently, EhBASIC only works with the Symon machine
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architecture, not with MULTICOMP.
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### 4.3 Loading A Program
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@ -184,7 +205,7 @@ reset.
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There are two very simple sample program in the "samples" directory,
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for testing.
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- 'echo.prg' will echo back anything typed at the console.
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- 'hello.prg' will continuously print "Hello, 6502 World!" to the console.
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@ -196,6 +217,9 @@ running.
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## 5.0 Revision History
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- **0.9.9:** 26 July, 2014 - MULTICOMP and multi-machine support
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contributed by Maik Marten <maikmarten@googlemail.com>
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- **0.9.1:** 26 January, 2014 - Support for IRQ and NMI handling.
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- **0.9.0:** 29 December, 2013 - First pass at a 6545 CRTC simulation.
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@ -234,8 +258,6 @@ running.
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- Better debugging tools from the UI, including breakpoints
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and disassembly.
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- More accurate timing.
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- UI needs a ton more polish.
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- More extensive testing.
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@ -247,6 +269,8 @@ running.
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- Allow displaying ACIA status and dumping ACIA buffers, for
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debugging.
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- Symbolic debugging.
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## 7.0 Acknowledgements
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This project would not have been possible without the following resources:
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@ -254,7 +278,7 @@ This project would not have been possible without the following resources:
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- [Graham Edgecombe's JTerminal project] (https://github.com/grahamedgecombe/jterminal),
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which forms the core of Symon's console.
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- [Andrew Jacobs' 6502 Pages] (http://www.obelisk.demon.co.uk/6502/), for
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- [Andrew Jacobs' 6502 Pages] (http://www.obelisk.demon.co.uk/6502/), for
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wonderfully detailed information about the 6502
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- [Neil Parker's "The 6502/65C02/65C816 Instruction Set Decoded"] (http://www.llx.com/~nparker/a2/opcodes.html),
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