SUBLEQ · OISC
ONE INSTRUCTION SET COMPUTER — mem[B] −= mem[A]; if mem[B] ≤ 0 goto C
INITIALIZING…
Settings & Controls
SPEED 4 steps/s
Output Port — addr FF
7
6
5
4
3
2
1
0
0x00 = 0
Input Port — addr FE (toggle switches)
7
6
5
4
3
2
1
0
0x00
Assembly Listing
Current Instruction
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Memory — 256 bytes · click cell to inspect
PC A operand B operand C operand
Click a cell to inspect
CPU Registers
PC
0x00
dec 0
A — SRC
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—
B — DST
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C — JMP
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RESULT
—
—
CYCLES
0
 
N=0
Z=0
BRANCH: NO
SUBLEQ A, B, C  —  mem[B] = mem[B] − mem[A]  —  if result ≤ 0 → jump to C
Program Name
Instructions — SUBLEQ A, B, C (hex bytes 00–FF)
Each row is one instruction at the listed address. B=FF writes to output; A=FE reads from input switches.
ADDRABC EFFECT
Memory Constants — data values at fixed addresses
Addresses used by instructions as operand data (counter value, constant 1, etc.)
ADDRVALUEDECIMAL