X Tutup
Skip to content

Latest commit

 

History

History

doc

Folders and files

NameName
Last commit message
Last commit date

parent directory

..
README.md
README.md
 
 
chip8studio.png
chip8studio.png
 
 

README.md

CHIP8 - Assembler

Mnemonic Table

Mnemonic Opcode Operands Description
sys 0nnn 1 Execute syscall
clr 00E0 0 Clear the screen
rts 00EE 0 Return from subroutine
jump 1nnn 1 Jump to address nnn
call 2nnn 1 Call routine at address nnn
ske 3snn 2 Skip next instruction if register s equals nn
skne 4snn 2 Do not skip next instruction if register s equals nn
skre 5st0 2 Skip if register s equals register t
load 6snn 2 Load register s with value nn
add 7snn 2 Add value nn to register s
move 8st0 2 Move value from register s to register t
or 8st1 2 Perform logical OR on register s and t and store in t
and 8st2 2 Perform logical AND on register s and t and store in t
xor 8st3 2 Perform logical XOR on register s and t and store in t
addr 8st4 2 Add s to t and store in s - register F set on carry
sub 8st5 2 Subtract s from t and store in s - register F set on !borrow
shr 8s06 1 Shift bits in register s 1 bit to the right - bit 0 shifts to register F
subr 8st7 2 Subtract t from s and store in s - register F set on !borrow
shl 8s0E 1 Shift bits in register s 1 bit to the left - bit 7 shifts to register F
skrne 9st0 2 Skip next instruction if register s not equal register t
loadi Annn 1 Load index with value nnn
jump0 Bnnn 1 Jump to address nnn + v0
rand Ctnn 2 Generate random number between 0 and nn and store in t
draw Dstn 3 Draw n byte sprite at x location reg s, y location reg t. (If n=0 and extended mode, show 16x16 sprite.)
skp Es9E 1 Skip the following instruction if the key value stored in register s is pressed
sknp EsA1 1 Skip the following instruction if the key value stored in register s is not pressed
moved Ft07 1 Move delay timer value into register t
keyd Ft0A 1 Wait for keypress and store in register t
loadd Fs15 1 Load delay timer with value in register s
loads Fs18 1 Load sound timer with value in register s
addi Fs1E 1 Add value in register s to index
ldspr Fs29 1 Load index with sprite from register s
bcd Fs33 1 Store the binary coded decimal value of register s at index
stor Fs55 1 Store the values of register s registers at index
read Fs65 1 Read back the stored values at index into registers

SuperChip instructions

Mnemonic Opcode Operands Description
scr 00Cn 1 Scroll n lines down
scrr 00FB 0 Scroll 4 pixels right
scrl 00FC 0 Scroll 4 pixels left
halt 00FD 0 System halt
low 00FE 0 Set 64x32 video mode
high 00FF 0 Set 128x64 video mode
Fs30 1 Not supported
Fs75 1 Not supported
Fs85 1 Not supported

Chippy syscall's

Address Description
100 Set CPU frequency to v0 * 10 hz
101 System reset
102 Set bg (v0) and fg (v1) color
X Tutup