Super Chip-8 emulator

Added on 30 Dec 2016, Last updated on 22 Sep 2019.

Version history

22 Sep 2019
Added fallback for not supporting the web-audio API

7 Jun 2018
Improved responsiveness

24 Jan 2017
Redid code, added Super Chip-8 support

2 Jan 2017
Fixed bugs with debug mode

30 Dec 2016
Initial upload

         
         draw each cycle 
         change I 
         shift Vy 
         mod random 

         carry with I 
         loop screen drawing 
         reset memory 

         wait on key 
         clear on switch 

         cycles 
        
        1 2 3 4   1 2 3 C   7 8 9 /

        Q W E R   4 5 6 D   4 5 6 *

        A S D F   7 8 9 E   1 2 3 -

        Z X C V   A 0 B F   0 . _ +
      
        Super CHIP-8 Assembler

        Super CHIP-8 Dissasembler

        Super CHIP-8 Documentation

The emulator works in any modern browser (recent versions of Chrome, Firefox, Safari or Edge) and IE11, and uses the web audio API for the Chip 8's buzzer (not in IE11).
You might need to mess around with autoplay setting to get audio working.

Following is information on the buttons and setting of this emulator.
It shows 3 keypads. The left one is the keys on the keyboard to use, the middle one is the chip-8 keypad and the right one are the keys that the interprenter on the HP-48 used.

Buttons

Run/Pause CPU: Pauses or unpauses the emulator.

Reset: Resets the emulator.

Debugging: On/Off: Turns displaying the registers and ram on or off.

Step instruction: When paused, executes one cpu instrucution and decreases timers by one.

Logging: On/Off: Turns log messages, such as resetting, loading and game exiting on or off.

Opcode logging: On/Off: Turns logging of executed opcodes on or off.

Clear log: Clears the log.

Settings

These settings change how certain things behave. Certain games require certain settings to be changed. After changing them, Press change settings to apply the settings.

Draw each cycle: Selects if the emulator should (try to) draw the display each cpu cycle, instead of being fixed at 60 FPS.

Change I: Selects if the opcodes to store/load data from memory chould change I after executing.

Shift Vy: Selects if the opcodes to shift registers should shift Vy and save it in Vx, or to shift Vx itself, ignoring Vy.

Mod Random: Selects if the opcode to generate a random value should mod (%) the random value with the specified value, or and (&) it.

Carry with I: Selects if I overflowing should effect Vf.

Loop screen drawing: Selects if sprites that are partially off-screen should loop the pixels to the opposite side or not draw them.

Reset memory: Selects if resetting should reload the memory and V-registers or leave them unchanged.

Wait on key: Selects if the opcode to wait for a key should only wait on a keypress, or on a pressed key being released.

Clear on switch: Selects if switching between high-res mode and low-res mode should clear te screen.

Cycles: Selects how may opcodes are executed per tick. Ticks happen at 60Hz.