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README updates, CRTC tests.
- Added more CRTC information to the README file. - Added unit tests for the CRTC. - Implemented register read for cursor position in the CRTC. - Bundling a new version of jterminal that has correct backspace behavior.
This commit is contained in:
Seth Morabito
parent
070e7380fc
commit
4a510b635e
38
README.md
38
README.md
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@ -3,7 +3,7 @@ SYMON - A 6502 System Simulator
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**NOTE: THIS SOFTWARE IS UNDER ACTIVE DEVELOPMENT. Feedback is welcome!**
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**Version:** 0.9.0
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**Version:** 0.9.0.1
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**Last Updated:** 29 December, 2013
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@ -22,7 +22,7 @@ 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, and a 6522 VIA.
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16KB of ROM, a 6551 ACIA, a 6522 VIA, and a 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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@ -42,8 +42,11 @@ for more information about this functional test suite).
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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`--`$9001`: 6545 CRTC
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- `$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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### 3.2 Serial Console and CPU Status
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![Serial Console] (https://github.com/sethm/symon/raw/master/screenshots/console.png)
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@ -95,9 +98,6 @@ By default, the 40 x 25 character display uses video memory located at base addr
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This means that the memory from address `$7000` (28672 decimal) to `$73E8` (29672 decimal)
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is directly mapped to video.
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The CRTC emulation is very rough around the edges at the moment. Only the following registers
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are supported:
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- Address Register (at address `$9000`)
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- R1: Horizontal Displayed Columns
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- R6: Vertical Displayed Rows
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@ -106,10 +106,21 @@ are supported:
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- R11: Cursor End Scan Line
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- R12: Display Start Address (High Byte)
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- R13: Display Start Address (Low Byte)
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- R14: Cursor Position (High Byte) [Read Only]
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- R15: Cursor Position (Low Byte) [Read Only]
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- R14: Cursor Position (High Byte)
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- R15: Cursor Position (Low Byte)
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In particular, please note that the Status register is not implemented yet. Still, the feature is ready for some testing and playing with.
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Although the simulation is pretty good, there are a few key differences between
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the simulated 6545 and a real 6545:
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- The simulated 6545 supports only the straight binary addressing mode of the real 6545,
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and not the Row/Column addressing mode.
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- The simulated 6545 has full 16 bit addressing, where the real 6545 has only
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a 14-bit address bus.
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- The simulation is done at a whole-frame level, meaning that lots of
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6545 programming tricks that were achieved by updating the frame address
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during vertical and horizontal sync times are not achievable. There is no way
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(for example) to change the Display Start Address (R12 and R13) while a
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frame is being drawn.
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For more information on the 6545 CRTC and its programming model, please see the following resources
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@ -118,6 +129,17 @@ For more information on the 6545 CRTC and its programming model, please see the
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- [MOS 6545 Datasheet (PDF)] (http://www.6502.org/users/andre/hwinfo/crtc/crtc.html)
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#### 3.6.1 Example BASIC Program to test Video
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This program will fill the video screen with all printable characters.
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10 J = 0
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20 FOR I = 28672 TO 29672
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30 POKE I,J
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40 IF J < 255 THEN J = J + 1 ELSE J = 0
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50 NEXT I
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60 END
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## 4.0 Usage
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### 4.1 Building
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62
pom.xml
62
pom.xml
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@ -4,7 +4,7 @@
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<groupId>com.loomcom.symon</groupId>
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<artifactId>symon</artifactId>
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<packaging>jar</packaging>
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<version>0.9.0</version>
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<version>0.9.0.1</version>
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<name>symon</name>
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<url>http://www.loomcom.com/symon</url>
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<properties>
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@ -44,7 +44,13 @@
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<dependency>
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<groupId>com.grahamedgecombe.jterminal</groupId>
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<artifactId>jterminal</artifactId>
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<version>1.0.2.2-loomcom</version>
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<version>1.0.2.3-loomcom</version>
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</dependency>
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<dependency>
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<groupId>org.mockito</groupId>
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<artifactId>mockito-all</artifactId>
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<version>1.9.5</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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@ -125,47 +131,6 @@
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</configuration>
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</plugin>
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<!-- Cobertura is essential -->
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>cobertura-maven-plugin</artifactId>
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<version>2.6</version>
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<configuration>
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<check>
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<haltOnFailure>false</haltOnFailure>
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<regexes>
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<regex>
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<pattern>com.loomcom.symon.*</pattern>
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<branchRate>90</branchRate>
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<lineRate>90</lineRate>
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</regex>
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</regexes>
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</check>
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<instrumentation>
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<includes>
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<include>com/loomcom/symon/*.class</include>
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</includes>
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</instrumentation>
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</configuration>
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<executions>
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<execution>
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<id>clean</id>
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<phase>pre-site</phase>
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<goals>
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<goal>clean</goal>
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</goals>
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</execution>
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<execution>
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<id>instrument</id>
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<phase>site</phase>
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<goals>
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<goal>instrument</goal>
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<goal>cobertura</goal>
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<goal>check</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>exec-maven-plugin</artifactId>
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@ -183,15 +148,4 @@
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</plugin>
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</plugins>
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</build>
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<reporting>
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<plugins>
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>cobertura-maven-plugin</artifactId>
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<version>2.6</version>
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</plugin>
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</plugins>
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</reporting>
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</project>
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@ -23,10 +23,12 @@
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package com.loomcom.symon;
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import java.util.*;
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import com.loomcom.symon.devices.Device;
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import com.loomcom.symon.exceptions.MemoryAccessException;
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import com.loomcom.symon.exceptions.MemoryRangeException;
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import com.loomcom.symon.devices.*;
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import com.loomcom.symon.exceptions.*;
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import java.util.SortedSet;
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import java.util.TreeSet;
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/**
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* The Bus ties the whole thing together, man.
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@ -17,7 +17,7 @@ public class Crtc extends Device {
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// Memory locations in the CRTC address space
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public static final int REGISTER_SELECT = 0;
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public static final int REGISTER_WRITE = 1;
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public static final int REGISTER_RW = 1;
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// Registers
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public static final int HORIZONTAL_DISPLAYED = 1;
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@ -90,25 +90,26 @@ public class Crtc extends Device {
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case REGISTER_SELECT:
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setCurrentRegister(data);
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break;
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case REGISTER_WRITE:
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case REGISTER_RW:
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writeRegisterValue(data);
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break;
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default:
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throw new MemoryAccessException("No such address.");
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}
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notifyListeners();
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}
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@Override
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public int read(int address) throws MemoryAccessException {
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switch (address) {
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case REGISTER_SELECT:
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return status();
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case REGISTER_WRITE:
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return 0;
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case REGISTER_RW:
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switch (currentRegister) {
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case CURSOR_POSITION_LOW:
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return cursorPosition & 0xff;
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case CURSOR_POSITION_HIGH:
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return cursorPosition >> 8;
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default:
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return 0;
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}
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default:
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throw new MemoryAccessException("No such address.");
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return 0;
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}
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}
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@ -121,10 +122,6 @@ public class Crtc extends Device {
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return memory.getDmaAccess();
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}
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private int status() {
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return 0;
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}
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public int getHorizontalDisplayed() {
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return horizontalDisplayed;
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}
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@ -169,7 +166,10 @@ public class Crtc extends Device {
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this.currentRegister = registerNumber;
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}
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private void writeRegisterValue(int data) {
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private void writeRegisterValue(int data) throws MemoryAccessException {
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int oldStartAddress = startAddress;
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int oldCursorPosition = cursorPosition;
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switch (currentRegister) {
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case HORIZONTAL_DISPLAYED:
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horizontalDisplayed = data;
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@ -213,24 +213,31 @@ public class Crtc extends Device {
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break;
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case DISPLAY_START_HIGH:
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startAddress = ((data & 0xff) << 8) | (startAddress & 0x00ff);
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// TODO: bounds checking.
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break;
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case DISPLAY_START_LOW:
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startAddress = ((data & 0xff) | (startAddress & 0xff00));
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// TODO: bounds checking.
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break;
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case CURSOR_POSITION_HIGH:
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cursorPosition = ((data & 0xff) << 8) | (cursorPosition & 0x00ff);
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// TODO: bounds checking.
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break;
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case CURSOR_POSITION_LOW:
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// TODO: bounds checking.
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cursorPosition = (data & 0xff) | (cursorPosition & 0xff00);
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break;
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default:
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break;
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}
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if (startAddress + pageSize > memory.endAddress()) {
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startAddress = oldStartAddress;
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throw new MemoryAccessException("Cannot draw screen starting at selected address.");
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}
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if (cursorPosition > memory.endAddress()) {
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cursorPosition = oldCursorPosition;
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throw new MemoryAccessException("Cannot position cursor past end of memory.");
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}
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notifyListeners();
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}
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}
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343
src/test/java/com/loomcom/symon/CrtcTest.java
Normal file
343
src/test/java/com/loomcom/symon/CrtcTest.java
Normal file
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@ -0,0 +1,343 @@
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package com.loomcom.symon;
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import com.loomcom.symon.devices.Crtc;
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import com.loomcom.symon.devices.DeviceChangeListener;
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import com.loomcom.symon.devices.Memory;
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import com.loomcom.symon.exceptions.MemoryAccessException;
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import org.junit.Before;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.mockito.Mock;
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import org.mockito.runners.MockitoJUnitRunner;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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import static org.mockito.Mockito.*;
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@RunWith(MockitoJUnitRunner.class)
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public class CrtcTest {
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Crtc crtc;
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@Mock
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DeviceChangeListener changeListener;
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@Mock
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Memory memory;
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@Before
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public void createDevices() throws Exception {
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crtc = new Crtc(0x9000, memory);
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crtc.registerListener(changeListener);
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when(memory.startAddress()).thenReturn(0);
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when(memory.endAddress()).thenReturn(0x7fff);
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}
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@Test
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public void selectingRegisterDoesNotTriggedrCallback() throws Exception {
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crtc.write(0, 1);
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verify(changeListener, never()).deviceStateChanged();
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}
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@Test
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public void shouldChangeHorizontalDisplayed() throws Exception {
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crtc.write(0, 1);
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crtc.write(1, 80);
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assertEquals(80, crtc.getHorizontalDisplayed());
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crtc.write(1, 40);
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assertEquals(40, crtc.getHorizontalDisplayed());
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}
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@Test
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public void changeHorizontalDisplayedShouldTriggerCallback() throws Exception {
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crtc.write(0, 1);
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crtc.write(1, 80);
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verify(changeListener, times(1)).deviceStateChanged();
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}
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@Test
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public void shouldChangeVerticalDisplayed() throws Exception {
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crtc.write(0, 6);
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crtc.write(1, 23);
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assertEquals(23, crtc.getVerticalDisplayed());
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crtc.write(1, 26);
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assertEquals(26, crtc.getVerticalDisplayed());
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}
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@Test
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public void changeVerticalDisplayedShouldTriggerCallback() throws Exception {
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crtc.write(0, 6);
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crtc.write(1, 23);
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verify(changeListener, times(1)).deviceStateChanged();
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}
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@Test
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public void shouldChangeScanLinesPerRow() throws Exception {
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crtc.write(0, 9); // Select register 9, Scan Line
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crtc.write(1, 3);
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assertEquals(3, crtc.getScanLinesPerRow());
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crtc.write(1, 5);
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assertEquals(5, crtc.getScanLinesPerRow());
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crtc.write(1, 9);
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assertEquals(9, crtc.getScanLinesPerRow());
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}
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@Test
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public void changeScanLinesPerRowShouldTriggerCallback() throws Exception {
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crtc.write(0, 9); // Select register 9, Scan Line
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crtc.write(1, 3);
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verify(changeListener, times(1)).deviceStateChanged();
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}
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@Test
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public void shouldChangeCursorStartLine() throws Exception {
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crtc.write(0, 10);
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crtc.write(1, 0);
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assertEquals(0, crtc.getCursorStartLine());
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crtc.write(1, 1);
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assertEquals(1, crtc.getCursorStartLine());
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crtc.write(1, 4);
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assertEquals(4, crtc.getCursorStartLine());
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}
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@Test
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public void changeCursorStartLineShouldTriggerCallback() throws Exception {
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crtc.write(0, 10);
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crtc.write(1, 5);
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verify(changeListener, times(1)).deviceStateChanged();
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}
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@Test
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public void cursorStartLineRegisterChangesCursorVisibility() throws Exception {
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crtc.write(0, 10);
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crtc.write(1, 0x00); // Start line 0, no blinking.
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assertEquals(0, crtc.getCursorStartLine());
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assertEquals(0, crtc.getCursorBlinkRate());
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assertTrue(crtc.isCursorEnabled());
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crtc.write(1, 0x23); // Start line 3, no cursor.
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assertEquals(3, crtc.getCursorStartLine());
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assertEquals(0, crtc.getCursorBlinkRate());
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assertFalse(crtc.isCursorEnabled());
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}
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@Test
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public void cursorStartLineRegisterChangesCursorBlinkRate() throws Exception {
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crtc.write(0, 10);
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crtc.write(1, 0x40); // Start line 0, 500ms blink delay
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assertEquals(0, crtc.getCursorStartLine());
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assertEquals(500, crtc.getCursorBlinkRate());
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assertTrue(crtc.isCursorEnabled());
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crtc.write(1, 0x62); // Start line 3, 1000ms blink delay
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assertEquals(2, crtc.getCursorStartLine());
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assertEquals(1000, crtc.getCursorBlinkRate());
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assertTrue(crtc.isCursorEnabled());
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}
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@Test
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public void shouldChangeCursorStopLine() throws Exception {
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crtc.write(0, 11);
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crtc.write(1, 0);
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assertEquals(0, crtc.getCursorStopLine());
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crtc.write(1, 3);
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assertEquals(3, crtc.getCursorStopLine());
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crtc.write(1, 6);
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assertEquals(6, crtc.getCursorStopLine());
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}
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@Test
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public void changeCursorStopLineShouldTriggerCallback() throws Exception {
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crtc.write(0, 11);
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crtc.write(1, 7);
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verify(changeListener, times(1)).deviceStateChanged();
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}
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@Test
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public void shouldChangeScreenStartAddressHighByte() throws Exception {
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crtc.write(0, 12);
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crtc.write(1, 0x00);
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assertEquals(0x00, crtc.getStartAddress() >> 8);
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crtc.write(1, 0x30);
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assertEquals(0x30, crtc.getStartAddress() >> 8);
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crtc.write(1, 0x6f);
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assertEquals(0x6f, crtc.getStartAddress() >> 8);
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}
|
||||
|
||||
@Test
|
||||
public void changeScreenStartAddressHighByteShouldTriggerCallback() throws Exception {
|
||||
crtc.write(0, 12);
|
||||
|
||||
crtc.write(1, 0x30);
|
||||
|
||||
verify(changeListener, times(1)).deviceStateChanged();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void shouldChangeScreenStartAddressLowByte() throws Exception {
|
||||
crtc.write(0, 13);
|
||||
|
||||
crtc.write(1, 0x00);
|
||||
assertEquals(0x00, crtc.getStartAddress() & 0xff);
|
||||
|
||||
crtc.write(1, 0x11);
|
||||
assertEquals(0x11, crtc.getStartAddress() & 0xff);
|
||||
|
||||
crtc.write(1, 0xff);
|
||||
assertEquals(0xff, crtc.getStartAddress() & 0xff);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void changeScreenStartAddressLowByteShouldTriggerCallback() throws Exception {
|
||||
crtc.write(0, 13);
|
||||
|
||||
crtc.write(1, 0xff);
|
||||
|
||||
verify(changeListener, times(1)).deviceStateChanged();
|
||||
}
|
||||
|
||||
|
||||
@Test(expected = MemoryAccessException.class)
|
||||
public void shouldThrowMemoryAccessExceptionIfPageOutOfRange() throws Exception {
|
||||
crtc.write(0, 12);
|
||||
|
||||
crtc.write(1, 0x7f); // Page of text will extend beyond 0x7fff
|
||||
}
|
||||
|
||||
@Test
|
||||
public void readingStartAddressShouldDoNothing() throws Exception {
|
||||
crtc.write(0, 12); // High byte
|
||||
|
||||
crtc.write(1, 0x03);
|
||||
assertEquals(0, crtc.read(1));
|
||||
|
||||
crtc.write(1, 0x70);
|
||||
assertEquals(0, crtc.read(1));
|
||||
|
||||
|
||||
crtc.write(0, 13); // Low byte
|
||||
|
||||
crtc.write(1, 0xff);
|
||||
assertEquals(0, crtc.read(1));
|
||||
|
||||
crtc.write(1, 0x0e);
|
||||
assertEquals(0, crtc.read(1));
|
||||
}
|
||||
|
||||
|
||||
@Test
|
||||
public void shouldChangeCursorPositionHighByte() throws Exception {
|
||||
crtc.write(0, 14); // Select register 14
|
||||
|
||||
crtc.write(1, 0x73); // Set high cursor byte to $73
|
||||
assertEquals(0x73, crtc.getCursorPosition() >> 8);
|
||||
|
||||
crtc.write(1, 0x3f);
|
||||
assertEquals(0x3f, crtc.getCursorPosition() >> 8);
|
||||
|
||||
crtc.write(1, 0x7f);
|
||||
assertEquals(0x7f, crtc.getCursorPosition() >> 8);
|
||||
}
|
||||
|
||||
|
||||
@Test
|
||||
public void shouldBeAbleToReadCursorPositionHighByte() throws Exception {
|
||||
crtc.write(0, 14);
|
||||
|
||||
crtc.write(1, 0x3f);
|
||||
assertEquals(0x3f, crtc.read(1));
|
||||
|
||||
crtc.write(1, 0x70);
|
||||
assertEquals(0x70, crtc.read(1));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void changeCursorPositionHighByteShouldTriggerCallback() throws Exception {
|
||||
crtc.write(0, 14);
|
||||
|
||||
crtc.write(1, 0x73);
|
||||
|
||||
verify(changeListener, times(1)).deviceStateChanged();
|
||||
}
|
||||
|
||||
|
||||
@Test
|
||||
public void shouldChangeCursorPositionLowByte() throws Exception {
|
||||
crtc.write(0, 15); // Select register 15
|
||||
|
||||
crtc.write(1, 0x00); // Set low cursor byte to $00
|
||||
assertEquals(0x00, crtc.getCursorPosition() & 0xff);
|
||||
|
||||
crtc.write(1, 0x1f); // Set low cursor byte to $1f
|
||||
assertEquals(0x1f, crtc.getCursorPosition() & 0xff);
|
||||
|
||||
crtc.write(1, 0xff); // Set low cursor byte to $ff
|
||||
assertEquals(0xff, crtc.getCursorPosition() & 0xff);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void shouldBeAbleToReadCursorPositionLowByte() throws Exception {
|
||||
crtc.write(0, 15);
|
||||
|
||||
crtc.write(1, 0x00);
|
||||
assertEquals(0x00, crtc.read(1));
|
||||
|
||||
crtc.write(1, 0x1f);
|
||||
assertEquals(0x1f, crtc.read(1));
|
||||
|
||||
crtc.write(1, 0xff);
|
||||
assertEquals(0xff, crtc.read(1));
|
||||
}
|
||||
|
||||
|
||||
@Test
|
||||
public void changeCursorPositionLowByteShouldTriggerCallback() throws Exception {
|
||||
crtc.write(0, 15);
|
||||
|
||||
crtc.write(1, 0x01);
|
||||
|
||||
verify(changeListener, times(1)).deviceStateChanged();
|
||||
}
|
||||
|
||||
@Test(expected = MemoryAccessException.class)
|
||||
public void shouldThrowMemoryAccessExceptionIfCursorGoesOutOfRange() throws Exception {
|
||||
crtc.write(0, 14); // Select register 14
|
||||
crtc.write(1, 0x80); // Can't position cursor
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user