GPR 0
LD
GPR 1
LD
GPR 2
LD
GPR 3
LD
IXR 1
LD
IXR 2
LD
IXR 3
LD
PC
LD
MAR
LD
MBR
LD
IR
MFR
CC
Store
St+
Run
HLT
Load
Ld+
SS
Init
0
1
2
3
4
5
Operation
6
7
GPR
8
9
IXR
10
I
11
12
13
14
15
Address
0000000000000000 / 000000
Console Terminal
Output / Echo
Line Input
Send Line
Clear
Device 0 = keyboard input. Device 1 = printer output. CHK returns 1 when ready/input is waiting.