MIS-256 Emulator

Program

Programming Guide

//
// Welcome to the MIS-256 Emulator!
//
// Click "Load" to load this program into the machine,
// or "Assemble" to check the program for errors.
//
// Once loaded, click "Step" to perform one instruction or
// "Run" to start the program.
//
// The emulator defaults to 10x real time speed.
// Modify the "Speed" value to run it faster or slower.
//
// You can set breakpoints by clicking on instructions
// in the machine display. You can also click on memory
// addresses to break when they are written.
//
// This website doesn't support saving or loading yet,
// so be sure to save your work in an external text editor!
//

// This example program shows a frame of a marble,
// and then a checkerboard pattern.

.data ; Lay out the data for a frame
FrameData:
  0b00011000 ; bottom row
  0b01111110
  0b01111110
  0b11111111
  0b11011111
  0b01001110
  0b01111110
  0b00011000 ; top row

.inst ; Now the instructions to render it
MemFrame:
  ZERO    ; Zero the register
  OR      ; Or with the value in memory to load
  DISPLAY ; Send it to the screen
  ZERO.I  ; Zero again, and increment data ptr
  OR      ; Load the next row
  DISPLAY ; Repeat for 8 rows...
  ZERO.I
  OR
  DISPLAY
  ZERO.I
  OR
  DISPLAY
  ZERO.I
  OR
  DISPLAY
  ZERO.I
  OR
  DISPLAY
  ZERO.I
  OR
  DISPLAY
  ZERO.I
  OR.I    ; Increment one last time to point
  DISPLAY ;   after the frame data

.data     ; More data for a checkerboard
Checker: 0b10101010

.inst     ; We can compute this one
CheckerBoard:
  ZERO    ; Load Checker
  OR
CheckerLoop:
  DISPLAY       ; Display sets the condition
  BRANCH :Reset ;   when it completes a frame
  NOT           ; Every row inverts the previous
  JUMP :CheckerLoop

Reset:
  SEEK -8        ; Reset data ptr to 0
  JUMP :MemFrame ; Restart

.data 16          ; Secret data!
Challenge:        ; shhhhhh
    0  60 102  90 ; Try to modify the program to show this
  126  90  60   0 ; pattern in addition to the normal one
  0b01010101

Running State

Speed
State: Waiting for Program

Execution:
Register:	0x00 0b00000000 0
Condition:	false
Data Ptr:	0
Inst Ptr:	0
Uptime:	00.0
Fetch Data Decode Instruction Dispatch RALU Store Data Display Flush Condition Adjust Ptr
Backbuffer:

Frontbuffer:

Previous Screens:

Program:

Memory:

// no program loaded

0		0
1		0
2		0
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4		0
5		0
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8		0
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31		0